Pcm power relay
Power Train Control Module (PCM) Power Relay, Coil-on -Plugs, Radio Noise Capacitator, Passive Anti-theft System (PATS) 9--10: 10: Rear Window Defrost: 11--12--13: 5:
GMC SIERRA ECU ECM PCM RELAY LOCATION 2007 2008 2009 2010 2011 2012 2013If you have GMC SIERRA and you want to see where the ECU ECM PCM relay, ECU ECM PCM ...
What Does Code P068A Mean? OBD II fault code P068A is a generic trouble code that is defined as “ECM/PCM Power Relay De-Energized Performance – Too Early”, and is set when the PCM (Powertrain Control Module) detects an improper de-energizing procedure for the relay that supplies it with power. While modern automotive control modules such ...I double checked the output side of my pcm relay and IDM relay. Yes, I still have power out of of the pcm relay. No on the IDM, but we talked about the ground for that being controlled by the pcm. I did not re-check the ground and hot pins feeding the PCM last night. So tonight, I'll pull fuses and check both sides of them. I'll pull the PCM ...Ford Mechanic: Ricardo Hohl. yes there are two powers both are battery powers there is one ground provided by the computer and this ground has to turn of when you turn the key to off position. Ask Your Own Ford Question. with the relay out the ground goes away, i am going to check to see if it goes away with the relay in, chances are it wont ...Conclusion. P0685 is usually caused by a bad relay or the circuits running to the relay. Good luck fixing your Ford F350. P0685 is a somewhat rare OBDII trouble code. It's a general code, so it has the same meaning for the Ford F350 as any other vehicle. It indicates that the circuit that provides power to the PCM is not functioning properly.Accessory Power Relay. Fuel Pump Relay. Powertrain Control Module (PCM) Relay. 1988 Volkswagen Golf. Genuine Volkswagen Part - 191906383C (191-906-383-C, …
This can indicate a problem with the relay or its circuit. Possible causes of the P0688 code include a defective PCM power relay, a faulty PCM, and a blown fuse or fusible link. Some symptoms of the P0688 code include an illuminated check engine light, the vehicle refusing to start, and the vehicle stalling.To function properly, a relay supplies power to the PCM through voltage signals from the battery, ground signals, and ignition switch input signals. Therefore, it is normal for the relay coil control circuit to have a low voltage. The PCM’s fault detection circuit detects voltage from the relay when you see trouble code P0685.The 2003 Ford Taurus has 2 different fuse boxes: Passenger compartment fuse panel diagram. Power distribution box diagram. Passenger compartment fuse panel. 1. 2. 4. Type. No.P2510 is a diagnostic trouble code (DTC) for "ECM/PCM Power Relay Sense Circuit Range/Performance". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic ...GMC SIERRA ECU ECM PCM RELAY LOCATION 2007 2008 2009 2010 2011 2012 2013If you have GMC SIERRA and you want to see where the ECU ECM PCM relay, ECU ECM PCM ...
PCM Power Relay. Relay . 31: Blower Motor Relay. Relay . 32: Two Speed Fuel Pump Relay [Gasoline only], Injector Driver Module Power Relay [Diesel only] Relay . 33: Washer Pump Relay. Relay . 34: Windshield Wiper Park/Run Relay. Relay . 35: Windshield Wiper HI/LO Relay. Diode ATO . 37: PCM Relay Diode. Relay . 38: Trailer Tow Backup Lamp …The Power Relay is used to supply voltage to the PCM, in other words, it’s function is to deliver to the powertrain control module the adequate battery voltage needed for its operation. This contact type relay uses the traditional 5-wire design. The control circuit is activated by the ignition switch (pin 86) and the ground (pin 85).Standard Ignition 30 Amp 5 Terminal Multi-Function Relay - RY30. Part #: RY30. Line: STD. Check Vehicle Fit. Powertrain Control Module (Pcm) Relay. Limited Lifetime Warranty. Terminal Type: Blade.1999 to 2016 Super Duty - PCM Relay fuse keeps blowing - Does anyone know what causes the PCM relay fuse to keep blowing out. All seems normal on this 00 F650 except that it keeps blowing. ... 1994.5 - 1997 7.3L Power Stroke Diesel. 4. 11-11-2011 09:10 PM. Question on fuse relays. bdub2. 1999 - 2003 7.3L Power Stroke Diesel. 2. 02 …Cigar lighter (power outlet) fuses are the fuse №33 (Auxiliary power points) and F32 (since 2017: Rear auxiliary power points) in the Instrument panel fuse box. ... Relay: R1: Ignition relay: R2: Not used: R3: Not used: R4: Driver heated seat: R5: Passenger heated seat: R6: Keyless starting: R7: Keyless starting: R8: Battery back-up sounder: R9:
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The P068A trouble code stands for “ECM/PCM Power Relay De-Energized Performance – Too Early.” This is an uncommon code, and it doesn’t appear on many …Jul 21, 2017 · OBD II fault code P0685 is a generic code that is defined as “ECM/PCM power relay -circuit open”, and is set when the PCM (Powertrain Control Module) detects that its own power supply has failed, or if it detects a low voltage in the circuit that supplies it with power. Note that this code only applies to applications that use a relay to ... DTC P2510 stands for “ECM/PCM Power Relay Sense Circuit Range/Performance,” and it’s logged when the vehicle exhibits signs of a no-start or hard starting condition. Code …3. Test the PCM Power Relay. If your Element won’t start and the relay is getting both power from the battery line and the keyed power (with a solid ground), it’s time to suspect the PCM power relay itself. Here’s a good video on how to test a relay. It’ll also give you a basic understanding of how they work if you’re having trouble ...Chevrolet’s 4.3-liter Vortec V-6 engines incorporated one or two knock sensors. These sensors detected incorrect fuel-air mixture combustion in the cylinder. The knock sensor relay...
PCM power relay, PDB fuse 27: 10: 60: Auxiliary battery relay (gasoline engine only), PDB fuses 8 and 24: 11: 50: IDM relay (diesel engine only) 12: 60: Engine compartment fuses 3, 5 and 26, 23 (diesel) Instrument panel fuses 26 and 32, PCM start relay: 13: 50: Blower motor relay (blower motor) 14: 30* 40The P0688 trouble code is often caused by an open circuit in the power relay sense circuit. This can occur due to a faulty ECM/PCM relay, which is responsible for supplying battery voltage and ground signals to the ECM. Corroded, loose, or damaged wiring and connectors can also lead to the storage of the P0688 trouble code.Jan 7, 2016 · A bad PCM-power relay may cause the vehicle to crank, but not start, or sometimes not even crank at all. 3. Battery Drain or Dead Battery. The final bad ECM relay symptom is a battery drain or dead battery. If the relay shorts it can leave power on to the computer, even when the vehicle is turned off. This will place a parasitic drain on the ... P2510 Code: Causes and fixes, ecm/pcm power relay sense circuit range/performance. If your car has the OBD-II, then this code problem is something your vehicle can suffer. Of course, cars created by manufacturers within the year 1996 till this present moment are no exception. You’ll get the P2510 code when the engine control …Mercury Grand Marquis (2003 - 2011) Fuse Box Diagram. In this article you will find a description of fuses and relays Mercury, with photos of block diagrams and their locations. Highlighted the cigarette lighter fuse (as the most popular thing people look for). Get tips on blown fuses, replacing a fuse, and more.May 7, 2011 ... The car has been running fine until yesterday when it died without warning on the highway. It would turn over and act like it wanted to start, ...If you've got aging parents, at some point you may have to manage their financial affairs. They'll give you a power of attorney. A handy guide from the government shows you what ... The automobile fault code P0686 indicates a problem with the Engine Control Module (ECM) power relay. This can result in the engine light being illuminated or the service engine soon warning light appearing. The most common causes of this fault code are a weak battery with low voltage while cranking, a faulty ECM power relay, an open or shorted ... The PCM power relay sends battery voltage safely to the ECM/PCM circuits. It is a contact relay activated by a cable connected to the ignition switch. This type of relay is usually five-wire in design. Relay’s working structure is simple. The powertrain relay is normally set in the on position. The relay receives continuous voltage from the ...The P0688 trouble code is often caused by an open circuit in the power relay sense circuit. This can occur due to a faulty ECM/PCM relay, which is responsible for supplying battery voltage and ground signals to the ECM. Corroded, loose, or damaged wiring and connectors can also lead to the storage of the P0688 trouble code.In the 2000 Ford F-150, the PCM fuse and relay are located in two separate fuse boxes. In the under-dash fuse box, you’ll find fuse number 2, 20 and 30, which is assigned for the PCM power fuse. In the under-hood fuse box, there is a specific fuse labeled as fuse number 18 is designated for the PCM. Additionally, Relay 304 is assigned to the ...The fifth wire is the power relay sense circuit. It is used by the PCM to monitor power relay voltage. If the PCM detects a low voltage condition on the power relay sense circuit, a code P0689 will be stored and a malfunction indicator lamp (MIL) may be illuminated. A typical PCM powertrain control module, opened up:
The Audi J271 is different to some VW's and has more terminals. It's also a good idea to check the relay socket wiring to or from the fuse box. P0685 - 17069 (ECM/PCM) Power Supply Relay - J271 - Circuit Open. P0686 - 17070 (ECM/PCM) Power Supply Relay - J271 - Short to Ground. P0687 - 17071 (ECM/PCM) Power Supply Relay …
When code P068A is stored, it indicates that the engine/powertrain control module (ECM/PCM) has detected a flaw in the de-energizing procedure for the relay that supplies it with voltage. In this case, the relay has de-energized prematurely. The PCM power relay is utilized to safely apply battery voltage to the appropriate PCM circuits.Oct 6, 2008 · There is no keep alive power PCM relay. This is simply a alwasy hot ciruit that keeps the power to the PCMs mempry banks. The PCM relay is switched on every time when the ignition is turned on. This in turn powers the PCM processor and an internal 5V power supply that then powers the two wire 5V sensors. Paul Nimz. Circuit 361 for IDM Relay coil Circuit 361 for PCM Power at pin 97 Circuit 361 for PCM Power at pin71 Circuit 361 to Connector 138 (C138, 42-pin connector near the UH fusebox), then changes to circuit 552 for IPR power. Location for S157 states it is in the Engine control sensor harness, near T/O (take out) to PCM. I would see if there is power ...(Using the attached 2002 F-Series Powerstroke Schematic, I assume the IDM relay only supplies 12V (no ground thru the relay) to the IDM module, which controls power to the glow plug relay and injectors as needed. We're trying to determine: 1) Where the possible short in the PCM relay harness might be. And, 2) If the PCM is still good.Circuit 361 for IDM Relay coil Circuit 361 for PCM Power at pin 97 Circuit 361 for PCM Power at pin71 Circuit 361 to Connector 138 (C138, 42-pin connector near the UH fusebox), then changes to circuit 552 for IPR power. Location for S157 states it is in the Engine control sensor harness, near T/O (take out) to PCM. I would see if there is power ...1. 2000-2001: Daytime Running Lamps Diode. 1998: Anti-Lock Brakes Indicator Diode. 1999: Not Used. 2. Electronic Engine Controls Diode. Fuse box diagram (fuse layout), location, and assignment of fuses and relays Mercury Mountaineer (1997, 1998, 2000, 2001).Step 1- Disconnect the battery. Figure 2. Disconnect battery. Disconnect the negative (black) cable of your battery. Step 2 - Locate the PCM. Figure 3. PCM location. Open your hood, locate the PCM, and record the numbers written on it.VW GOLF No No Start ,Crank mk6 mk7 ecu problems emc pcm power relay p0685 17069ECM Power Relay Control J271 Magnet Marelli 4HV IMMO fix repair cloning 0131...Oct 7, 2022 · The third circuit is usually responsible for carrying a signal from the ignition switch. There’s a fourth wire that supplies voltage to the PCM when the relay is grounded and closes. If the PCM detects a high voltage condition on the power relay sense circuit, it will store the code P0690 and illuminate the check engine light.
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Compounding interest is where an investment will pay interest on both the initial principal and the accrued interest. To find the power of compounding, an investor should compare t...ECU ENGINE CONTROL MODULE RELAY FORD FOCUS MK3 2012-2018In this video we will show you how to replace the relay for the ECU Engine Computer Module on Ford Fo...Accessory Power Relay. Fuel Pump Relay. Powertrain Control Module (PCM) Relay. 1988 Volkswagen Golf. Genuine Volkswagen Part - 191906383C (191-906-383-C, …The automobile fault code P0686 indicates a problem with the Engine Control Module (ECM) power relay. This can result in the engine light being illuminated or the service engine soon warning light appearing. The most common causes of this fault code are a weak battery with low voltage while cranking, a faulty ECM power relay, an open or shorted ...In the end, if you are not getting power to the fuel pump relay, in most cases, it’s either a bad fuse or a faulty ECM. So, that’s where you should start your investigation. Check all the fuses in the cabin fuse …When the bladder fills with urine, sensory nerves send impulses to the brain telling it the bladder is full. The nerves connect with other nerves in the spinal cord to relay this i...My Battery is currently 12.1v in the morning, so I'm ordering a new battery to rule out low power affecting the PCM/ECU. My initial query in my first post was that is the under hood fuse/relay box is not the normal one seen in all the manuals and on the web for my model and year, whereas all documentation shows this type (see pic below).1. Check the battery voltage to ensure it’s within the specified range. 2. Inspect the wiring and connections related to the ECM/PCM power relay. 3. Test the power relay for proper operation or replace it if necessary. 4. If the issue persists, consider having the ECM or PCM inspected by a qualified technician.P068A ECM/PCM Power Relay de-energized to early. Jump to Latest Follow. 81K views 14 replies 11 participants last post by sick350 Feb 25, 2017. Flyin' Hawaiian Discussion starter. 644 posts · Joined 2008. #1 · Mar 17, 2011. Have a 6.7 that has this code, H&S Tuned, went to start truck just clicked....thought the batteries were toast charged ...HONDA CRV CR-V PCM RELAY LOCATION, POWERTRAIN RELAY 2012 2013 2014 2015 2016If you have Honda CRV CR-V and you want to see where the PCM relay, powertrain re... The PCM (powertrain control module) receives data about the vehicle’s operating conditions from various areas in the system. In order to work properly, the PCM is supplied with power by a relay, which uses a battery voltage signal, a ground signal, and an ignition switch input signal. The voltage in the relay coil control circuit is normally low. ….
2018 Escape Fuse Diagram Battery Junction Box. 1 Not used 2 Not used 3 Not used 4 Not used 5 Not used 6 Not used 7 50 Anti-lock Brake System (ABS) module 8 30 Anti-lock Brake System (ABS) module 9 50 Not used 40 Not used 10 40 Blower motor relay 11 30 Low voltage Direct Current/Direct Current (DC/DC) Converter 12 30 PCM power …The P0688 trouble code is often caused by an open circuit in the power relay sense circuit. This can occur due to a faulty ECM/PCM relay, which is responsible for supplying battery voltage and ground signals to the ECM. Corroded, loose, or damaged wiring and connectors can also lead to the storage of the P0688 trouble code.A stored code P0885 simply means that the PCM has detected an open condition in the power relay control circuit for the transmission control module (TCM). Open could be translated as disconnected or cut for diagnostic purposes. Usually the TCM is integrated into a single housing with the engine control module (ECM).Feb 27, 2023 ... Power at PCM power relay, power to switch side but not at the coil side fuel relay in engine fuse box, no blown fuses, swap around relays ... On this episode of Fear No Fix, Chris and ChrisFix team up to diagnose a PCM Relay issue and replace it in a 5.4L Ford F-150 (model years 2004-2008).Symptoms... Diagnostic trouble code(DTC) P0689 stands for “ECM/PCM Power Relay Sensor Circuit Low.”. The code is set once your vehicle’s computer detects a possible problem with the relay that supplies it with voltage. The PCM is in charge of controlling the powertrain, which includes the engine and transmission. It keeps track of parameters like ...Ground for the pcm relay is supplied by the pcm pin 33brn/wht. Fuse 39 supplies power into the relay for both the coil and load (terminal 86 30) which should be hot at all times. Pcm pins 2 4 6 are ground from ground 103. Yes, I have 12v at 76 (12.6ish).Fuse 39 is good and has 12v .3. Test the PCM Power Relay. If your Accord won’t start and the relay is getting both power from the battery line and the keyed power (with a solid ground), it’s time to suspect the PCM power relay itself. Here’s a good video on how to test a relay. It’ll also give you a basic understanding of how they work if you’re having trouble ... The engine control module (ECM), also known as the powertrain control module (PCM), is the main computer that controls your engine's performance functions and ensures your vehicle is operating its best. The PCM circuit board is coded with vehicle-specific software that acts as the brain of the engine, telling it how to run and operate properly. Pcm power relay, PCM Relay Coil, Ignition Coil (Gasoline only), Fuel Heater (Diesel only), Wastegate Solenoid (Diesel only), Injector Driver Module Relay Coil (Diesel only) 31 — Not Used: Relay 1 — Interior Lamp Relay: Relay 2 — Batteiy Saver Relay: Relay 3 — Rear Defroster: Relay 4 — Power Window One Touch Down Relay: Relay 5 — Accessory Delay Relay, May 26, 2022 · Trouble code P068A is defined as ECM/PCM power relay de-energized too early. This code is a generic fault code, meaning it applies to all vehicles equipped with an OBD-II system, especially vehicles manufactured from 1996 to present. Some of the more common brands that have this code include Audi, Cadillac, Chevrolet, Dodge, Ford, Jeep ... , P0689 is a diagnostic trouble code (DTC) for "ECM/PCM Power Relay Sense Circuit Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $154.99 ., One of the most common symptoms of a faulty ECM/PCM power relay is engine stalling . If your engine stalls while driving or idling, it could be a sign that the power relay is failing. This is because the power relay is responsible for supplying power to the ECM/PCM, which controls the engine’s operation., In the 1998 Ford F-150, the PCM fuse and relay are located in two separate fuse boxes. In the under-dash fuse box, you’ll find fuse number 20, which is assigned for the PCM power fuse. In the under-hood fuse box, there is a specific fuse labeled as fuse number 24, designated for the PCM. Additionally, Diode 1 and Relay 8 are assigned to …, KL15 RELAY POWER TRAIN CONTROL MODULE RELAY LOCATION FORD FOCUS MK3 2012 2013 2014 2015 2016 2017 2018In this video we will show you how to replace the relay..., Jul 29, 2011 ... Pin 8 from the PCM sends power to the fuel pump relay. We are using a volt/ohm meter. We tested contentuited etc at the wire. We removed the ..., When the power goes out, you probably reach for a flash light—that is, if you can remember where you put it, find your way in the dark, and hope you remembered to change the batter..., The PCM power relay or ECM power relay work as a switch and transfer power to the ECM. However, if the ignition key turns off, the switches within the PCM power relay will not receive battery power. As a result, your vehicle will not operate properly. Also, when a PCM relay stays open, it cannot transfer power to the ECM., The third circuit is usually responsible for carrying a signal from the ignition switch. There’s a fourth wire that supplies voltage to the PCM when the relay is grounded and closes. If the PCM detects a high voltage condition on the power relay sense circuit, it will store the code P0690 and illuminate the check engine light., Ford Ranger Fuses and Relays Diagram (1998 – 2000) by Car GuruDecember 22, 2020. 4208 4018 3. 1. Here you will find Fuses and Relays diagrams for the Ford Ranger of 1998, 1999 and 2000 production years. Information about the location of the fuse panels inside the car and the purpose of each fuse and relay., The Audi J271 is different to some VW's and has more terminals. It's also a good idea to check the relay socket wiring to or from the fuse box. P0685 - 17069 (ECM/PCM) Power Supply Relay - J271 - Circuit Open. P0686 - 17070 (ECM/PCM) Power Supply Relay - J271 - Short to Ground. P0687 - 17071 (ECM/PCM) Power Supply Relay …, P0685. Hi Piloteers, I’m having trouble locating which relay I need to replace. My 2008 Pilot EXL is throwing code P0685 “ECM/PCM Power Relay Control Circuit/Open”. My fuses all look OK but I can’t seem to figure out which relay needs replacing. The issue is that occasionally the radio, navigation, and interior electronics cut out at ..., If a new or known-good relay is used and the circuit still isn't working, then you can determine if you need to proceed with further diagnosis and repair. O'Reilly Auto Parts carries brake relays, A/C relays, lighting relays, wiper relays, and more to help keep all of the electrical systems on your vehicle operating safely. Show More., When creating email blasts, be sure that your readers are getting all of the information you want to relay to them, while showing that you value their time. One way to do this is t..., The PCM (powertrain control module) receives data about the vehicle’s operating conditions from various areas in the system. In order to work properly, the PCM is supplied with power by a relay, which uses a battery voltage signal, a ground signal, and an ignition switch input signal. The voltage in the relay coil control circuit is normally low., If you own a home or business that relies on a boiler system for heating, you know how important it is to have a reliable and efficient setup. One crucial component of any boiler s..., My car have code p0685 ECM/PCM control power relay circuit open, no Epc and engine light the car just crank but don’t start which relay should I replace and the location It’s a golf 5 gti BWA engine. Reply. Gary. 20.10.2022 at 23:35 . Having a problem with my son’s 09 Golf GTI. The passenger headlight isn’t working, then the passenger ..., Vodacom had offered to pay Makate about $3 million but the inventor is demanding over $1.2 billion in compensation, arguing that the figure constituted 5% of revenue from the group..., Pull the PCM Power Relay from the Battery Junction Box and set it aside. Pull the Blower Motor Relay from the Battery Junction box and insert the pulled relay into the PCM Power Relay position. Reconnect the battery cable. Turn the ignition key to On and see if "CHECK ENGINE" is illuminated. 7. , The third circuit is usually responsible for carrying a signal from the ignition switch. There’s a fourth wire that supplies voltage to the PCM when the relay is grounded and closes. If the PCM detects a high voltage condition on the power relay sense circuit, it will store the code P0690 and illuminate the check engine light., Power Train Control Module (PCM) Power Relay, Coil-on -Plugs, Radio Noise Capacitator, Passive Anti-theft System (PATS) 9--10: 10: Rear Window Defrost: 11--12--13: 5: Radio: 14: 10: Traction Control Switch, Anti-lock Brakes (ABS), Instrument Cluster: 15: 15:, Fuel pump testing at the CCRM: Pin 5 is output power to the pump. Pin 11 is battery power to the FP relay. Pin 13 is ignition input to energize the relay. Pin 18 should show ground when the pump is on. Testing here needs to be careful since the ground pulse to the relay goes away after the Prime-out. Good luck., Accessory Power Relay. Fuel Pump Relay. Powertrain Control Module (PCM) Relay. 1988 Volkswagen Golf. Genuine Volkswagen Part - 191906383C (191-906-383-C, …, P0686 is a diagnostic trouble code (DTC) for "ECM/PCM Power Relay Control Circuit Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $154.99 ., Inspect the ECM/PCM power relay: If the fuse is not the issue, inspect the ECM/PCM power relay. Look for any signs of damage or corrosion. If you find any issues, replace the relay. Test the ECM/PCM power relay: Use a multimeter to test the ECM/PCM power relay. Follow the manufacturer’s instructions to ensure proper testing., P0689 is a diagnostic trouble code (DTC) for "ECM/PCM Power Relay Sense Circuit Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $154.99 ., “Half of what we will teach you in medical school is right, and half of it is wrong – the problem is we don’t know which is which.” This quote, or some variation of it, is relayed ..., Other Names: Fuel Pump Relay, HVAC Blower Motor Relay, Horn Relay, Starter Relay, Accessory Power Relay, Powertrain Control Module Relay, Window... More Names Replaces: FOAZ-14N089-A, GU5Z-14N089-G, VW GOLF No No Start ,Crank mk6 mk7 ecu problems emc pcm power relay p0685 17069ECM Power Relay Control J271 Magnet Marelli 4HV IMMO fix repair cloning 0131..., FORD EDGE ENGINE COMPUTER RELAY LOCATION REPLACEMENT. ECU PCM DME FUSEIf the Engine Computer ECU PCM does not work and you are trying to find where the Engin..., When a P0687 code is stored, it typically means that a high voltage condition has been detected by the powertrain control module (PCM) or one of the other controllers, in the circuit which powers up the PCM or the circuit by which the other controllers monitor PCM power supply voltage. Most OBD-II equipped vehicles use a contact relay to supply ..., Save on Powertrain Control Module Relay at Advance Auto Parts. Buy online, pick up in-store in 30 minutes.