Diagnose and fix P1275 no AC condition
If you have a P1275 no AC condition on a Chrysler vehicle, here’s how to test and fix the problem. When you turn on your 2008 or later Chrysler vehicle’s AC, the totally integrated power module (TIPM) sends power to the AC compressor clutch coil to pull in the clutch disc and run the AC compressor. A normal AC compressor clutch coil draws about 3-4 amps. The TIPM monitors current draw while the AC compressor is running and shuts off power to the clutch if it detects more than 7 amps. At that point the TIPM sets a P1275 AC CLUTCH CONTROL CIRCUIT 2 OVERCURRENT trouble code.
Possible causes of a P1275 code
• TERMINAL DAMAGE OR CORROSION
• AC CLUTCH GROUND HIGH RESISTANCE
• AC CLUTCH CONTROL OUTPUT CIRCUIT HIGH RESISTANCE
• AC COMPRESSOR CLUTCH
• TOTALLY INTEGRATED POWER MODULE (TIPM)
Diagnose a P1275 code
With the engine off, disconnect the AC compressor clutch harness connector. Inspect the terminals for corrosion or damage. Inspect the wiring harness itself for chaffing, pierced spots or broken wires. Next, check for excessive resistance by performing a voltage drop test in the clutch coil power circuit and clutch coil ground circuit.
Connect a fused jumper wire from the battery to the AC clutch. Start the engine and use an amp clamp or the amp draw feature on your digital meter to measure the actual current to the compressor clutch. If the current exceeds 7 amps. If your reading shows 7 or more amps, replace the compressor clutch.
©, 2017 Rick MuscoplatPosted on by Rick Muscoplat