PCM wiring diagram needed
#1
PCM wiring diagram needed
I am in the need of the wiring diagram for the PCM which shows which pin or color wire goes to what. My coil is not getting enough voltage to lock it in and I am in need to see which wire come out of the PCM towards the relay or coil to make it lock in. This is a 2005 Ford Ranger Edge 2wd with a 3.0
#2
#4
The PCM (pin 69) grounds the A/C clutch relay coil via the pink/yellow to direct power to the A/C clutch field coil. If you have only 5 volts across the compressor coil, check the A/C compressor clutch diode and relay (underhood box). Also, check the ground point at the front left corner of the engine compartment.
#5
The PCM (pin 69) grounds the A/C clutch relay coil via the pink/yellow to direct power to the A/C clutch field coil. If you have only 5 volts across the compressor coil, check the A/C compressor clutch diode and relay (underhood box). Also, check the ground point at the front left corner of the engine compartment.
The pressure switch contacts may have high resistance causing the clutch voltage to be low.......
Last edited by Takeda; 07-29-2008 at 08:31 AM.
#6
The high and low pressure switches are not in same circuit as the compressor clutch solenoid in the 2005 Ranger.
#7
Bob, you probably have much less than 1 OHM back to the battery, and dropping 7V....the fuse will blow!!
#8
#9
#10
The PCM provides the GND on the coil of the relay to pick it. It's possible that the relay contacts are bad, causing the big voltage drop. Since they are cheap, I would try replacing the relay first.
#12
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