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Old 05-27-2013
Thread Starter

I am: Oliver Mason
Join Date: May 2013
Location: Montreal, QC
Vehicle: 2008 Mazda B4000 4X4
Posts: 1
Total Props: 0
2008 Ranger (B4000) A/C PCM Ground wire

I've got a 2008 "Ranger" (Mazda B4000), 4X4, 4.0L on which I can't get the A/C system to work.

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 : pressures are perfect
- HP and LP cutoff switches are in working condition
- I've jumped the relay switch and the clutch kicks in and the A/C system provides cold air, so the clutch and compressor are good

Now I have no ground coming from the relay comtrol terminals, and I do believe that ground is coming from the PCM-ECU, probably a broken wire, but which one...?

That's why I request your help to help me identify this wire with a PCM/ECU wiring diagram.

Help would be greatly appreciated as the hot weather is lurking in.
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Old 05-31-2013
03DualSport's Avatar
I am: Robert Rowland
Join Date: Jul 2005
Location: Wimberley, Tx
Vehicle: 2006 Mazda B4000 4x4
Posts: 260
Total Props: 0
2008 Ranger (B4000) A/C PCM Ground wire-graphic.gif
Hope this helps!
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