- Pcm ground wire Ensure all ground wires are firmly connected and that the ground points are free of rust and dirt. Feb 4, 2015 · I located some rotted wires inside the PCM connector harness. Anyone know where I can find the ground wire from the PCM to chassis? May 15, 2020 · Morning everyone, working on a PCM ground wire issue issue and am hoping someone can help. -chart- Jul 15, 2013 · I believe the main PCM ground is G107, on the front of the engine near/above the power steering pump. "Checked for power and ground to the PCM upon inspection found ground wire at intake manifold burnt. Dec 31, 2024 · The negative side comes from the PCM and is what controls commanding the injectors on and off to fuel flow Using a volt meter put the black wire probe to a ground and red probe to the light colored wire of each injector's wiring connect with key on, engine off to see if they all are getting the positive side of 12 volts Oct 15, 2024 · PCM Complete Inboard Gas Engines, PCM Boat Inboard Engines and Components, PCM Sterndrive Motors & Components, PCM Inboard Intake & Fuel Systems, PCM Outboard Powerhead Components, Ignition Wires for Buick LeSabre, Ignition Wires for Buick Rendezvous, Ground Force Car and Truck Wheels, Ignition Wires for GMC Yukon, What is the Chevy Silverado Ground Wire Location? The ground wire in Chevy Silverado is located on the battery's negative terminal, engine block, radiator core support, cylinder head, and on the engine itself. 0 V at all times Less than 1. in looking at some info i have the PCM has 3 ground wires. . Been there done that and fixed bad idle speed. It could be anything. The BK PIN 25 ground wire (attached to the firewall) was crimped already. 5. Thanks Apr 5, 2023 · Today I went out and pull the PCM and tested the wire (OR/GR) after tracing it back to the PCM. But to your specific question, wiring problems & computer problems have a tendency to look pretty similar. Sep 19, 2023 · I checked for ground at the sensor's harness but no ground. Jun 12, 2019 · 04 Chevy Silverado 3500 Vortec 6. 1993 - 2005 Chevrolet Blazer AWD, RWD, 4WD. Dec 8, 2011 · When diagnosing any sensor-related complaint, the PCM ground wires should display less than 0. OEM # 12167310. There are two shielded wires with a foil wrap crimped to the this ground wire. Reference 10 on Pages 10 Feb 5, 2007 · I'm thinking one of the switch wires would tap into the fuel pump ground wire, while the other switch wire would be grounded to something. I got some odd voltage issues so I'm guessing its these ground wires Aug 10, 2022 · 06 WK/GCO, MDS "ON" Light, Vortex Gens, Debadged, DashHawk, BT Catch Can, SRT CAI, AFE Hi-Flow Filter, Sonnax Trans Press Booster, Transgo Shift Kit, 6 speed 545RFE via 08 PCM and HP Tuner, ARH long tube headers w/3 in. Circuit Number C2 (Red) This table contains all of the 1999 Pin connections, Wire colors, and Functions of Connector C2 (Red). IMPORTANT: To test the PCM's Ground wires (circuits) the PCM needs to be connected to both its connectors. Is it: Battery NEG to Frame. Sep 23, 2024 · you can back probe near the PCM to determine if it's getting a good ground, and if it's distributing a good ground. Most of the sensors use the ground supplied by the PCM. 0 V at all times Terminal number Wire color RED BLU YEUBLK Terminal name KS KNOCK SENSOR) PCM R101012 100 AMP ALT. Again, it is vital that all fuses are good and the battery is good. Yesterday I put in the new PCM and bolted everything back into place. Note that this was tucked up into the wire loom, and I had handled it a couple of times without seeing it. So we were starting to consider a weak ground in or going to the PCM. 5 3500 Cummins I'm referring to the split ground wires two share a lug on the PCM and one goes to the block? I'm wrapping up a complete rebuild of the engine and wiring. Disconnect the 3 plugs at the PCM Cut and strip the 8 gauge wire then cut the connector off the 10 gauge wire and strip it back to fit the butt connector. Feb 18, 2021 · Inspect the main engine wiring harness ground terminal (G103) for this condition. GROUND WIRE Genuine OEM PleasureCraft-Crusader part. Feb 11, 2021 · If there is corrosion I'd be looking near the battery terminal and the 6 inches into the wire. 1. This circuitry and every connector have continuity. It looks like it would be used to hold down the pcm connector. Key Ground Locations include: Engine block to the firewall 🛠️ The ground wire you're asking about is a ground for something (or some things) with wiring in that bundle. 0L on which I can't get the A/C system to work. All indications point to a dead PCM. Oct 3, 2024 · The 2003 Chevrolet Silverado has specific ground wire locations that vary depending on the model. It carries the negative side current of the alternator to the car body, and at the top makes the PCM ground the same as the engine. 0 Related: wiring harness 1Q APP sensor: voltage APP sensor: Switch the ignition to ON Approx. Even worse they had been connected to a painted bracket which holds up the shifter bracket. Once that happens, the secondary side of the relay is closed and power from a 30-amp fuse (fuse 11) sends power to the trigger wire on the starter motor. black and yellow. One end, under the driver's side, forward of the wheel, looking at the compounder cover, location is circled in red. I'm pretty sure it has come up here before, but a quick search doesn't fine it for me. I did this with the PCM harness unplugged. Jun 29, 2017 · While troubleshooting a bad ground I came across some scans of the service manual regarding electrical ground locations for our platform posted on another site. There are 2 ground wires and I can't remember how they go. It is critical. Again if there is corrosion one indication is connections he getting hot. But on this durango the power is being sent from the pcm. Ground wires are essential for any vehicle’s electrical system Dec 15, 2023 · Disconnect the PCM ground wire from the relay, and ground the relay coil manually - does the relay close, and provide battery power to the glow plugs? If so, you're down to a possible open wire between the relay and PCM, or a defective PCM GPR control circuit, I think. One is ground 105 and ties to the battery to the chassis, The other goes to ground 104, which is a ground for the pcm, dlc, mass air flow ect. Each pin or connector on the PCM may be labeled with a unique identifier, making it easier to locate and test specific components or circuits. 4. Sep 26, 2024 · Note: Power from the ignition switch (start position) runs through the neutral safety switch, through the primary side of the starter relay, and gets ground a ground signal from the PCM. Apr 1, 2023 · Back grounds relocated. It must only be grounded through this small type screw's threads and the underside of this screw's head that contacts the PCM's ground wire terminal end, as this metal panel is painted where the ground wire terminal end makes contact contact with this metal panel. In the passenger compartment, you will find it on the A-pillar, lower left side of the steering column, under the driver side door, and front passenger side. 3L. Oct 16, 2017 · Does anyone have a pic of the PCM in place showing the ground wires? 2004. 4 240k miles Im back again for some advise on my no crank no start. Apr 14, 2022 · When taking a look at the small wire that splits from the negative battery cable from LMR, I see that it already includes the ground for the ECU that fits the factory plug (shown in photos below). Oct 5, 2010 · Measured resistance between PCM and Coil F connector - 0. ASD relay has B+ and ignition +, ground wire from ASD socket to PCM is OK. 8. While a few specific vehicle applications might display as much as 0. I for one had a bad PCM ground take out 2 PCM's and 2 crank sensors to boot on my other Jeep before I found out what the problem was. 1 for unlock/lock and other 2 black wires for up & down window switch on passenger door but still have 4 other black wires I believe might go to courtesy light-1 black wire -the door ajar -1 black wire totals 2 still 2 black wires remain I don’t understand electrical diagrams The black wires are attached in the photo. 3 I used a paper clip inserted in the wire harness so thought if I am getting a ground from PCM, I should be able to put the test light on the posi side of battery and get a light. If no voltage, the problem is with a blown fuse, CCRM, or wiring. I'll check the voltage in both wires along with a continuity of the grounds. There is also a separate chassis ground stud near the ground bar with a single ground wire attached. Jun 17, 2012 · Making new cables and need help figuring out factory ground wire set up. I’ve changed the battery and am running through some Oct 8, 2024 · So far on my truck I have found 3 ground connections one coming from the negative battery cable to the passenger side cylinder head, another coming from the body to the driver's side cylinder head, and another under the driver's side floor board coming out of a wiring harness and connects to the frame. The PCM is a vital component of your vehicle’s engine management system and controls various functions, such as fuel injection, ignition timing, and emissions. Wiring diagrams can be found in the Resources section on this site. No crank, gauges dead, CTS programmer not connecting. Not only wrong spot - but a bad electric conductive one. Long Braided ground strap attached to the passenge side head. Feb 10, 2013 · I bought a 99 Wrangler not running. With a tug of the black wire, the terminal remains firmly attached. These are the orange wire and the red/yellow wire. PCM has ASD output acknowledgment when ASD is jumped. Replace alternator. Trying to add in some ground around the engine. Post the results of the tests and will go from there. But it back on the manual indicated Nov 4, 2007 · Being the inside cab's metal panel is painted that the PCM's ground wire is suppose to be grounded to. 7E. You did not list your car year and such and what your issues are. Nov 28, 2016 · I've tended to think Zee that the 94-95 might be like the 93 where the PCM ground is tied into the negative battery ground. Dec 31, 2012 · Engineers probably put there to shorten wire run, the black wire goes to a splice (s109) in harmess up near the PCM where it breaks out and feeds 2 pins in PCM, oil lever sensor, MAS, and then goes inside to dash through P110 and another splice that feeds a bunch of other things. 3 Ohms - wire is good Checked for short to ground to verify wire good - Infinite Resistance - wire is good Plugged PCM connector back in and checked resistance to ground - ~3 MOhms - Seems like a short to ground on the driver circuit. The pcm grounds are usually near the pcm. Found a broken ground wire from ESS to PCM. Full ground continuity from PCM ground leads to ground wire end at G103. The ground here is maintenance and should be done by 10 years of age at minimum. Cut the wire back 2 inches, a new terminal, and life is good again! Dec 30, 2022 · I got under the truck and added the ground wire to the starter, I also added a plug from the PCM that will connect to the vehicle and it'll be easy to discon We would like to show you a description here but the site won’t allow us. Or that's the return voltage from a sensor. Bolts to the engine block anywhere. Oh, I almost forgot, if the ground needs to bee routed into the PCM, where would it go ? The wire harness Jul 20, 2012 · By the "v", do you mean the two 3 different wires forming the v? Ground 105 is the direct battery ground to the chassis. back of head to firewall. Regularly inspecting these ground wires is crucial. Oct 22, 2008 · My pcm c1 plug has pin 31&32 blk/tan ground wires wire nutted to another blk/tan wire that connects to a grey plug that connects to the old passenger side batt ground then from the batt ground it goes to a grey plug and across the front of the engine. If i jumper that with a wire (with the relay in place) and connect terminal 1 to the negative of the battery, the clutch engages. I then checked for continuity between the PCM wiring harness (pin 22) and the CKP sensor ground wire, thinking there may be a broken wire. 3. Frame to firewall (cab). 2005 - 2009 Saab 9-7x AWD. Move the wire located at connector J3 (WHITE/GREY/CLEAR), pin 18 to connector J1 (BLUE), pin 23. Jan 31, 2025 · The GM PCM Ground Wire Update is a maintenance procedure that involves replacing the existing ground wire in the powertrain control module (PCM) with a heavier gauge wire. Technician B says that the TP sensor is used by the PCM to determine torque converter engagement and transmission shift points. 14 volts to both the outside wires on the plug while the truck was running and the ESS was unplugged. This tag notes that the wiring harness has been modified. Trying to figure out if my ground wire from fuse to plug is bad, or if it is fuse to pcm ground that is shorted. Because grounds are easy to check, and they can be the most unpredictable in their behavior, always checking grounds before throwing parts at something is wise. 1 valvetrain, SLP 25% UD Pulley, BBK 90mm TB, SOS Coils, TEA Jul 16, 2022 · Fuse compartment 1 fuse 3, AC/daytime running lights. If you need to disconnect any of the two PCM connectors, to identify these Ground wires, you need to disconnect the battery's Ground terminal first. Jun 21, 2016 · I already figured it out, this was a loose PCM ground wire (on the negative battery terminal wire). These are the 2 black/tan wires at pins 31 and 32 in the black connector. PCM has a ground strap. A typical 2003 Silverado might have over 35 ground wires. However,with a tug of the red wire, the terminal separates from the wire. 050 volts in the key-on, engine off or key-on, engine running position. Feb 24, 2006 · 2. Of these wire upgrade, the short battery to car body wire upgrade was the most Mar 2, 2014 · 1999 4. 7L 4WD' On the top front of the PCM there is what appears to be a ground wire (black in color) bolted to the case of the PCM. Jul 31, 2018 · Yes i think my inbox was full limited to only 20 messages, the PCM came from car computer exchange i thought of switching PCM also but didnt want to expose the good working one to a possible harness issue or ground that would or may damage that one, Sep 22, 2018 · But there was mention somewhere along this issue of a treatment of the passenger side black/tan ground wire that comes out of the harness below the PCM, goes under the intake box along the passenger fender and connects to the same ground wire the other one with the grey plug. If voltage is present, the problem is a bad fuel pump, bad FPDM, or bad PCM. Dec 2, 2013 · 1-Verify that there is battery voltage going in to the PCM at pin connectors 2 and 22 on the black connector. Dec 20, 2010 · If the fuel pump does not prime, test for +12 volts at the trunk IFS switch. It is a Y connection. Ah HA! Fixed it, tested it, getting voltage to PCM. Add to Cart Quick view Add to Cart. Especially smaller ground wires, under 10 gauge. I don't know if it was just shortening it up or what. There is no ground to engine neither to the Feb 20, 2013 · Simple cheap auto parts store variety, from O'Reilly. The center wire is ground from my understanding, mine appears to be spliced in with ground wires from PCM, TPS, ESS, and then goes to the head on the engine for ground. 1994 - 2002 Pontiac Firebird RWD. 1K views 6 replies 5 participants last post by Puckfynn May 25, 2017 Oct 4, 2024 · Any loose connections or damaged wires can lead to malfunctioning electronics. Ground issues can cause erratic behavior in the truck’s electrical systems. Be very careful adding ground wires. 0L Getting this code p2135 reduced engine power. The PCM is stupid, whether there's pressure in the system or not if the low and high pressure switch connectors are jumpered with a u-shaped piece of wire 12 volts will go to the PCM and show a demand. Good Oct 28, 2023 · Yea,,, Full Power to the PCM ground wire likely blew the semiconductor, that controls the GPR, on the PCM's board The fine wires in the GPR's Coil reduce the amount of current that the PCM gets down to a point where the tranisior inside can handle it. There WAS continuity between the PCM connector and the CKP sensor. Headlight ground is inside the cab . Took it off, cleaned it, no problems since. Repair ground wire and road tested veh. Short black ground wire that comes out of the pcm harness. For instance, the ground wire on the battery’s negative terminal is a critical location. 0 APP Nov 5, 2017 · And again, make sure G103, to the rear of G102 is good/clean. Doing this would barely light the test light. Check the ECM ground wire, which is located on the back of the transmission and connected with the transmission mount. There are 80 pins on this connector Oct 3, 2022 · If I add a ground wire, can it be ground in the engine compartment or does it need to go to the PCM ? Do I need to use a GPT or primary wire or would a 16 or 18 gauge standard ground wire work; they are available at Home Despot. This is looking across the engine bay down to the driver's There is an orange ground wire that leads from Powertrain Control Module (PCM) pin 49 to the back of the passenger side cylinder head. No tach or charge. The old factory terminals were just terrible and also _loose_. Frame to engine block. The reason I am confused is that the long ground strap has a stud with a double bolt on top. We will cover inspecting and replacing the ground cables, ensuring solid connections at grounding points, and dealing with issues related to older threads and bolts. May 24, 2017 · Possible pcm or ground wire problem Jump to Latest 4. I completed all of big 3 except for engine to ground. Engine cranks but won’t start for several reasons, but bad ECM ground is one of them. I am getting full continuity from PCM to alternator field wires. A fault in any of these ground wires can lead to malfunctions in the associated components. The answer is always yes. Nov 14, 2024 · The ground wires within the wiring harness offer a return path for the electrical current from each component, ensuring that the current safely returns to the battery. Feb 16, 2015 · The 18-gauge black wire (left) was crimped with a proper production crimp tool and die set. 2. The PCM wiring diagram typically includes information such as the power and ground connections, sensor inputs, output controls, and communication lines. 080 volts, most ground terminals will display close to zero voltage. The ground is the aft small post on the GPR. Removed old PCM a few weeks ago, also had to remove TCM in order to get PCM out. pins 47, 48, 49. If needed i will provide you with my phone number as well. So after chasing this electric issue for over a month I have came up with another possible solution to getting this truck back to running again. These are the black/tan colored ground wires you mentioned so there could be multiple grounding points. 2000 Ram 2500 24v SLT Laramie 4x4, 47re Dec 17, 2024 · This the prime current path from the Alt to the body. I think you actually have a sensor shorted to ground. Continuity: 008 Resistence: 1. Nov 17, 2016 · Truck wouldn't start after that. Apr 10, 2014 · RED PCM 32 Pin Connector; Pin Wire Color Description A-1: BLK/WHT: PCM Ground A-2: TAN/WHT: PCM Ground A-3: LT BLU/WHT: Idle Air Control (IAC) Valve 'A' High Apr 25, 2020 · Went looking for the ground wire and I found this one, hopefully the only one. 2 the fusible links are between the battery and the engine inside a square plastic sheath3 the10-11 and 10-10 are the same wire but shown on two pages. You will also find a few Dec 18, 2010 · Viola! Still cannot access generator field for charging or RPM though new PCM with scan tool. Removed the ground wires for for the PCM and cleaned, sanded, dremelled and replaced at G102 & G103 main ground bolts under the motor. You’ll also find other ground wires on the engine block, radiator core support, and cylinder head. This includes both short and long wheel base, as well as both 4. concern is gone at this time" Jul 3, 2000 · I have a 2000 7. Scanner showed coded U0100, U0101, and C0379. There should be two black negative wires coming off the battery. Oct 8, 2024 · can a [ground] erroneously cause [engine codes, symptoms, strange behavior] Yes. Sep 29, 2011 · The PCM only grounds the GPR when the oil temp is cold. Oct 22, 2007 · Then we took a test light and hooked it to the positive side battery terminal and put the probe into the ground wires (back probing) for the TPS, ACT, and the DPFE sensors. where is best spot on engine to put the ground? My truck currently runs: Bat NEG to a/c compressor mount. 2L and 5. However, the battery cable I got from the parts store needs to be spliced onto the existing cable. It could be PCM ground, a ground for the electric radiator fans if it's a heavier gauge. 7L’s (bought used, 162K miles) is not cranking over. Aug 12, 2023 · Can anyone tell me exactly the location of the ECM ground wire for a 2004 Chevy Silverado 2500hd ls 6. Still no god damn tach or charge. Install the jumper wire between connector J2 (RED), pin 26 and connector J3 (WHITE/GREY/CLEAR), pin 18. If you are checking it with a volt meter or a test light it will show power as it is attached to the coil on the GPR. 7 v8 grand cherokee. The PCM is not supplying a ground. The ground wires in a 2007 Chevy Silverado can be found on the side of the engine block and at the bottom of the engine on the frame rail. Nov 27, 2018 · 1999 - 2016 Super Duty - BYPASS PCM GROUND- NO CRANK - 2002 F250 5. There's 2 PCM ground wires on G103 and wouldn't doubt those replacing PCM's may be due to a bad ground. My first question is where is this broken end supposed to be connected to? Mar 1, 2020 · The other gray connector may have already been disconnected when the ground wires were relocated to the back of the timing cover if a W-T . Aug 1, 2019 · Both crankshaft sensor wiring(2009) and camshaft position sensor wiring(2012) have been spliced/repaired over time. 3 F350 powerstroke 4x4. Still no tach or charge. Credit goes to Wex Oct 4, 2024 · Grounding issues in a 2000 Chevy Silverado can cause various problems, from flickering lights to trouble starting the engine. Pay close attention to the ground points. It should be clamped between the dipstick tube bracket and the head. Can anyone tell me the color of the PCM ground wire? Oct 4, 2024 · If you’re grappling with electrical issues in your 2007 Chevy Silverado, understanding where the ground wire locations are can make all the difference. Oct 16, 2013 · There are circuits that communicate between the PCM and IDM, one is the FDCS, or Fuel Delivery Command Signal on a Brown/Orange wire, another is the Cylinder Identification Signal Input on a yellow/lt blue wire, and the third is the Electronic Feed Back Signal on a Grey/White wire. We must examine the chassis harness as well. If you have any questions or if your not sure Please do not attempt as this could blow your ECU. Special Order Item. I like the black wheel thingy. Nov 27, 2021 · 2008 Jeep Commander Sport 3. So I replace ESS, and gap correctly. PCM has fused B+ and ignition + and both grounds. Let’s discuss the importance of ground wires, methods to troubleshoot ground faults, and the role of ground locations. I performed all the usual checks: fuses, voltage,resistance of the high speed bus wires, etc. Jul 25, 2022 · So i dug a little deeper and found out that the relay has power and activates the AC clutch relay via terminal 1 which provides a ground from the PCM. The problem I am looking into is every wiring diagram that I can find for a durango 3. 6 days ago · Which wire on a typical TP sensor should back-probed to check the voltage signal to the PCM? Ground wire Signal wire Meter should be connected between 5-volt reference and ground 5-volt reference (Vref) Jan 9, 2008 · Per Subaru, on their diag notes. In the wiring diagram the ground point is designated "GP 21", but no location (sorry). Mar 26, 2012 · For some reason I have a dangling wire in that location. When ASD circuit is jumped, PCM still has no 5v reference or communication to data link. Oct 4, 2024 · Step-by-Step Guide to Ground Wire Maintenance. It is broken off at length of about 10 inches from the PCM. Jan 10, 2025 · When you turn your key to start your car, it makes a repetitive chirping sound that is called cranking. Function 1 - - Not Used 2 PU 1132 DLC Class 2 Serial Data 3 - - Not Used 4 BK 1050 Ground 5 BK/WH 1851 Ground 6-15 - - Not Used 16 OG 640 Battery Positive Voltage DTC Diagnostic Procedure Modules U1000 DTC U1000 Audio Amplifier, BCM, DDM, DSM, EBCM, ESC, FPDM, HVAC, IPC, PCM, Radio, RSA, SDM, TCSCM, VCIM U1016 DTC Technician A says that the 3 wires on the TP sensor include a 5-volt reference voltage from PCM, plus the signal wire to PCM, and ground. Feb 16, 2025 · I checked the plug to the ESS today and I have 5. Nov 23, 2010 · So testing one or two PCM Ground wires is enough to let you know their overall health. Aug 11, 2019 · Hey everyone, I got a quick question; I'm having issues with no power to injectors corresponding to cylinder 1 and 2 and I wanted to make sure the pcm ground wire was in the correct position as you can see in the picture, I removed it from where I put it; I mounted it to the bolt on the top side of the pcm 3rd one from the top to the bottom May 27, 2013 · General Technical & Electrical - 2008 Ranger (B4000) A/C PCM Ground wire - I've got a 2008 Ranger (Mazda B4000), 4X4, 4. The switch could be mounted under the dash, so before you turn the ignition, you'd flip the switch, ground the fuel pump and take the PCM out of that sequence. Trying to test grounds for evap vent solenoid. those go to the splice S252 that might be in the right kickpanel where the MAF black and orange wire is also connected along with a shield connection and the VSS brown and blue Oct 5, 2019 · That is called the "ground strap". All diagnostics pointed to bad PCM. PCM R121029 WIRE HARNESS RELAY Jul 15, 2018 · 3. Basically, the ground’s not connected and I’m not sure where it goes. Corrosion in the camshaft wiring entering the distributor and woodchuck nibbling on the crankshaft wiring. PG2 (POWER GROUND) PGI (POWER GROUND) Power source for ECM/PCM circuit Ground circuit for ECM/ PCM Ground circuit for ECM/ With ignition switch ON (Il): battery voltage With i nition switch OFF: about O V Less than 1. The 18-gauge red wire (right) was crimped with a general repair tool. The BK ground wire PIN25 (case Ground) goes behind the engine. In looking at the 95 FSM 4. 0: Related wiring: harness 1O - - - --1P: MAF sensor ground: MAF/IAT sensor: Under any condition Below: 1. Sep 10, 2024 · The other day I ran another diagnostic and it finally read PCM GROUND or something or another (I'm not the exactly sure the number of the code or how it was worded on the the scanner) but I know the when I looked up the code it specifically mentioned the PCM ground wire. Install the tag included in the kit around the VCM wiring harness. The plug on the wiring IAT 30°C {86°F} 1. Feb 2, 2011 · This is simply a helpful guide with pictures Ideas and extra Information on performing the VCM ground wire update. WIRE HARNESS UPDATE KIT. I don't think mounting battery NEG to a/c mount is OEM. I checked the wire plugs at the PCM and found grounds on the following: facing the PCM the plug to the left tested #'s 12 and 24 to ground. More info. Vehicle is an 06 chevy tb 4. It allows to disconnect the negative wire without a wrench. Had to pull the wire out of the loom to see the problem (actually felt it first). IIRC P1763 is a problem with the governor pressure sensor in the transmission. catback, Bilsteins, SRT bumpers/roof rails/brake cooling ducts, SRT Lwr Sprgs/Sways, FRI Sidewinder Cam Adv 6*, 6. 0 PCM connector pin-out cavities/pins 5, 11, 12, are all grounds for the PCM. The smaller wires are the sensors return (ground) and the PCM ground. Knowing these spots can save you a lot of time and Aug 20, 2014 · I removed ALL the battery cables, lengthened the ground PCM ground wires (which were too short and may have been pulled when the coach flexed) and replaced the ring terminals on the PCM ground wires with soldered (not crimp) terminals. It's definitely not the alternator ground. Maintaining the ground wires in a 2004 Chevy Silverado is crucial to keep the truck running smoothly. We have also considered the PCM to be bad. I would not change the wiring to different ground points, as this may introduce electrical noise. The ground wires are crucial for electrical connections. 2-Verify that the 2 ground wires for the PCM are reading 0 resistance/good continuity to ground. I never had one off and not had a Vulcan in years. 9 harness 1N Constant: voltage (Vref) Fuel tank pressure: sensor Switch the ignition to ON: Approx. Jun 20, 2021 · I presume because of engine vibration over the years. Oct 4, 2024 · Why it matters: Poorly grounded engines or chassis can lead to electrical issues, causing diagnostic trouble codes (DTCs). 6l from … shows the power for the fuel pump relay coil coming from the run/start relay and the ground signal coming from the pcm. Look around the pcm for a ground wire and follow it back to the pcm. What has been done / tested so far - All fuses are good - A/C Compressor clutch relay switch is good - Has the A/C system flushed and refilled : Jan 15, 2025 · In the wiring diagram you may find both the PCM and the audio amplifier, either Bose or ASK, use the same ground point. 0? Researching online I see where it is referenced to be on the back of the transmission, if this is correct. The wire terminal (G103) attaches either to the front or to the rear of the right side cylinder head, depending on the model year of the Full Size Pickup and/or Utility Trucks. Most of the ground wires in your Silverado are in the engine bay, and you can usually spot them either on the top or bottom of the truck. As backstory, my 2005 WK 5. Eventually discovered that grounding the ECM to the chassis would allow it to start. For example, poor grounding of the engine block can affect the performance of the Powertrain Control Module (PCM), which controls many engine functions. The ground wire is roughly 8" in lenght. 2. The middle plug I tested #'s 4, 5, 6, 12, 15, and 16 to ground. Some PO had the two wiring harness grounds connected to a bolt at the transmission. Used a wire tracer to check all wires for broken wire or ground fault. Jan 27, 2018 · To get the wiring harness out of the way it looked as if I was going to have to disconnect almost the whole left side of the engines wiring harness and didn't really want to disturb that many connections right now so I just loosened the bolt for the ground wire a little sprayed some WD40 on it and tightened it back up. Jun 18, 2019 · PCM Ground Wire Diagnostics using a “Graduated Eye-Ball, Hands and Fingers: The Mechanic examined the Ground Wire located at the Front Passenger Side Engine Head where there is a “Beefy Nut On A Stud” and was looking for anything obviously LOOSE with the Ground Cable. I have seen some late model chrysler vehicles that do send a power from pcm instead of a ground signal for the fuel… Jun 22, 2009 · ASD relay dosen't get ground signal from PCM. The Importance of Ground Wires. I just replaced the PCM. Now I am left with this one ground wire and I can't remember where it went! I think it Pin Wire Color Circuit No. ljp jfsi ethf oai gaafw yjvg kvjvq cjegzs twuhqxk qsfsf kjbkftx uwq purp icgma roamqu