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Can u wire around a PCM fuse? - Cars & Trucks

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Yes you can but the fuse is there to protect the wiring and harness. To wire around it is to invite total wiring harness meltdown or vehicle fire. It is a lot more sensible to find the cause of why the fuse is blowing and fix the dead short.

Posted on Nov 18, 2014


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2004 Chevy Trailblazer LT w/inline 6cyl cranks but won't start. Fuse #28PCM-1blows when ign is turned to ON. Do you have a wiring diagram for this circuit? Thank you.Bob

This fuse powers the injectors. You may have a shorted injector but usually this is caused by the pink wire touching a hot engine and melting the insulation--causing a short. First trace the pink wire from the injectors to the fuse box inspecting for damage. Also trace it to the pcm. If no damage, disconnect all injectors and put in a fresh fuse. Turn the ignition on and check the fuse. If it burned, the wire is still shorted and you can assume the injectors are ok. The short could be in the pcm. You can cut the pink wire to the pcm and put in another fuse. If it burns again, you definitely have a short along the wire. If it doesn't, the pcm is bad. Repair the wire with sloder and electrical tape.
If the fuse did not burn the first time, turn thr ignition on and plug the injector in one at a time, checking the fuse after each one to see which one is shorted.



Sep 15, 2017 | Cars & Trucks

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Why is my battery dead every morning.alt & battery tested good.only draw is EIC & TCM .IF I TAKE OUT THOSE 2 FUSES BATTERY DON'T GO DEAD.ANY IDEAS

Sounds like you have a wire that is grounding out somewhere. Trace wires to find a break in insulation around the wire

Apr 22, 2016 | 2002 Chevrolet TrailBlazer

1 Answer

Im looking for the ECU fuse on a 2006 jeep commander under dash what fuse is it?

the cars electrics are complex. as is the ECU (now called a PCM)
the PCM has up to 3 to 4 fuses.
typically 1 for spark, 1 for fuel and 1 for PCM and one more for the ecu memory fuse, that if pulled clears the PCM errors (DTC:)
all this is in the (factory, serv. man)
btw if the PCM CEL lamp is dead, that be the PCM main fuse.
also part of MAIN relay on all cars with EFI and the ASD relay.
in 2007 jeep wiring changed radially, so.... something to consider and know that they some times do that gradually.
is this a gas engine,? there are 3 gas engines, (sizes)
the engines size also dictates which PCM you have.
sure wish i had just a clue as to a symptom so i dont have to read the full wiring tree..... 32 page in the fsm on fuse/spark alone.

JB fuse 24, to pCM. (jb means cab box
) PDC means engine bay. MIP box has power feed to PCM too on pin 12 (more later )

PDC fues 6. for ASD main.
PDC fuse 28 the injectors.
PDC fuse 16, coil spark.
i missed some, as i did not see the hot all the time fuse (mem)

ah, pdc fuse 20 is PCM memory. found it.
page 2 is missing on my source, so....

the PCM also does the job of TCM to shift some transmissions.
and that may have its own fuses too.

May 06, 2015 | 2006 Jeep Commander

1 Answer

My 2003 rendevous is not charging, it has a neww battery and the alternator is good. What could be going on?

Check the fuses first. Ignition and PCM fuses. Check the big wire from the alternator to the battery. Check battery clamps. On any of these corrosion could and will cause no charging. After that, you need a wiring schematic. You'll need to check wires from the PCM to the alternator. The PCM is what turns the alternator on. If all those wires and cables check out good, you looking at replacing the PCM. 2003 is year specific. Meaning you can only put a 2003 PCM in it. The PCM also has to be programmed for your vehicle.

Feb 24, 2015 | 2003 Buick Rendezvous

2 Answers

I have a 98 Lincoln Town Car i have replaced the fuel pump, coilpack, fuses, new PCM and the car will still not start. I think there is a problem with the wiring from the fuse box to PCM can you guide me...

possible , but I suggest running the fault codes first as the problem could be a crank/cam position sensor, immobilizer or ignition control module or fuse

Feb 02, 2018 | 1998 Lincoln Town Car

2 Answers


Those two codes refer to a problem of digital communication between the Powertrain Control Module and the Sentry Key Immobilizer Module (1686) and between the Powertrain Control Module and the Instrument Cluster (1687). The action taken of removing a plug from the BCM may have caused one or both of those codes. You would do well to disconnect the battery for a few seconds, then touch the two battery wires together (having removed both clamps from the battery), then reconnect the clamps to the battery. Then drive the vehicle and see if the same codes are still present.
If they are then I would find the communication bus wires (which are distinguished by being a pair of wires twisted around each other for their entire length) at the plugs for the PCM, the cluster, the BCM, and SKIM module and with the use of an ohmmeter or continuity tester then check that all the pins of the disconnected plugs that carry those wires are connected to one another (using the wire colors to identify the pin connections to verify continuity. Try gently flexing the wires while checking for continuity to detect a loose connection at each of the pins.
If the connections prove out, then I believe that it would be prudent to find a good shop which can use a diagnostic readout box to determine if the problem is the PCM, the cluster, or the SKIM module. It is too expensive to buy a module without proof that you have a bad one.

Aug 06, 2013 | 1999 Jeep Cherokee

1 Answer

What does the code p1166 mean on my 2003 rsx type s

DTC P1166: A/F Sensor (Sensor 1) Heater Circuit Malfunction

  1. Reset the ECM/PCM.
  2. Start the engine.
Is DTC P1166 indicated?

YES - Go to step 3.

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at C101 (located under the right side of the dash), C401 (located under the left side of the dash), C402 (located under under the left side of the dash) the A/F Sensor relay, the A/F Sensor (Sensor 1) and the ECM/PCM.

  1. Check the following fuse:
    • No.14 OPTION (30A) fuse in under-hood fuse/relay box.
    • No.2+B LAF HEATER (20A) fuse in under-dash fuse/relay box.
    • No. 4ACG (10A) in under-dash fuse/relay box.
Are any of the fuses blown?

YES - Repair short in the wire between the A/F Sensor relay and the fuses.

NO - Go to step 4.


  1. Measure voltage between ECM/PCM connector terminals A1 and A24, 30 seconds after the ignition switch is turned ON (II).
Is there battery voltage?

YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.

NO - Go to step 5.


  1. Measure voltage between ECM/PCM connector terminals A22 and A24.
Is there battery voltage?

YES - Go to step 6.

NO - Go to step 10.

  1. Turn the ignition switch OFF.
  2. Disconnect ECM/PCM connector E (31P).
  3. Turn the ignition switch ON (II).

  1. Connect ECM/PCM connector terminal E8 to body ground with a jumper wire, then measure voltage between ECM/PCM connector terminals A1 and A24.
Is there battery voltage?

YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.

NO - Repair open or short in the wire between the A/F Sensor (Sensor 1) and ECM/PCM (A1).

  1. Turn the ignition switch OFF.
  2. Disconnect the ECM/PCM connector A (31P) and the A/F Sensor (Sensor 1) 4P connector.

  1. Check for continuity between the A/F Sensor (Sensor 1) 4P connector terminal No.3 and body ground.
Is there continuity?

YES - Repair short in the wire between the A/F Sensor relay, A/F Sensor (Sensor 1) and ECM/PCM (A22).

NO - Go to step 13.

  1. Turn the ignition switch ON (II).

  1. Measure voltage between ECM/PCM connector terminals E8 and A24.
Is there battery voltage?

YES - Repair open in the wire between the ECM/PCM (A22) and the A/F Sensor (Sensor 1).

NO - Go to step 15.

  1. Check for continuity in the wires between the A/F Sensor and the fuses.
Is there continuity?

YES - The wires are OK. Replace the A/F Sensor relay.

NO Repair open in the wire between the A/F Sensor relay and the fuses.

Mar 17, 2011 | Acura RSX Cars & Trucks

1 Answer

2003 grand voyager no power to glow plugs relay changed and light on on dash board

Hi Clive.................. you are going to have to check the engine wiring harness( broken wires/earths).... also for corrosion under power dist centre (fuse box) and check corrosion around and in PCM... (power control Module.. Engine computor)..... have had this before and ended up with a new PCM...... dont panic yet though... very often it is a wiring or corrosion fault....... last resort will be the PCM..... advice would be to get it checked properly at your nearest dealer, or by a very very good reputable auto electrician/technician......... hope this helps............ Steve... chrysler dodge jeep..... Botswana

Dec 27, 2010 | 2003 Chrysler Voyager

1 Answer

Replaced TH700R4 on 1988 c/ cruise control and speedometer do not work.tested vss & wiring from vss to cruise control module and from ccm to powertrain control module.both check good. Repair...

I would look at the wiring around the bellhousing first to be sure you have not pinched any wires. On that truck, behind the glove box is the PCM, and another white colored box called a DRAC. The DRAC controls the speedometer not the PCM. Look into replacing it. Also check your trans and gauge fuses. Good Luck.

May 06, 2009 | 1988 Chevrolet K1500

1 Answer

Veh wont start

by looking at the wiring diagram for your truck. the pcm1 fuse only feeds the pcm so most likely it is a grounded wire between the fuse block and pcm. follow the wire harness closely between the two and see if its grounded somewhere. also try disconnecting the pcm and see if the fuse still blows. that would isolate the problem to the wiring. it is highly unlikely that the pcm would cause the problem.

Nov 27, 2008 | 2004 GMC Envoy

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