ourobos wrote:
I ran a jumper wire on circuit a209 to PCM C1 #29 and it fired right up and the ECU connected. The PCM was not powering up due to this wire lacking voltage. I'm not sure where the break is, any idea where this wire runs FROM the PCM, looks like through the firewall. I'm going to monitor the battery for parasitic loss, removing the negative terminal and checking amps across it and the negative post shows no amps, so I'm hoping it was a clean break. Problem resolved hopefully.
I forgot yours is a gas version, my bad!
After studying the wiring diagrams, the cavity #29 on the C1 PCM connector comes from the battery 12v. It is powered from fuse #24 (20 amp) in the Power Distribution Center (TIPM) in the engine compartment. It is an 18 gauge Red wire and goes through the C105 connector #5 pin.
Notes of interest, fuse #24 also supplies power to the fuel pump.
First I would check fuse #24 with a 12v test light to ensure you have 12v on both sides of the fuse. You cannot look at a fuse and ensure that it is good, only testing with a 12v test light or voltmeter will ensure that it is good.
If it is good, I would then pull the fuse and look at the female connectors that it plugs into and make sure there is a good tight connection on both sides with NO green crusties (corrosion).
According to the wiring diagram, the 18 ga. Red wire leaves the Power Dist. Center and runs directly to and through bulk connector C105 and then leaves there and runs directly to the PCM pin #29.
If you have power on both sides of the #24 fuse and good connection, I would probe both sides of the C105 connector pin #5 and see if 12v is present on both sides.
C105 is on the passengers side of the engine compartment according to the FSM.
I suspect your loss of power is in the C105 connector, if that is not the case, then you have a broke wire somewhere in the harness and it will be time to open up the harness and start probing the red wire every so often to locate the break.
If you need any help with the wiring diagrams, let me know. PM me your email address and I can send you wiring diagrams with the circuits highlighted.
Good luck and keep us posted.
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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited
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