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Diagnostic Aids

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  1. 1) DTC 1464: A/C On During KOER Cylinder Contribution Self-Test

    Turn A/C heater control switch off. Repeat KOER CYLINDER CONTRIBUTION SELF-TEST . If DTC 1464 is set, go to next step. If DTC 1464 not set, fault may be intermittent. Go to step  4).

  2. 2) Check A/C Power Circuit For Short

    Turn ignition on. Disconnect A/C clutch connector. Measure voltage between ground and Gray/White wire at A/C clutch wiring harness connector. If battery voltage is present, locate and repair short to power. Clear DTCs, and repeat QUICK TEST . If battery voltage is not present, go to next step.

  3. 3) Check For Short To Power

    Turn ignition off. Disconnect PCM 104-pin connector, and inspect for damaged pins, corrosion and loose wires. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between ground and test pin No. 41 at breakout box. If battery voltage is present, locate and repair short to power. Clear DTCs, and repeat QUICK TEST . If battery voltage is not present, replace PCM. Clear DTCs, and repeat QUICK TEST .

  4. 4) Check For Intermittent Short To Power

    Turn ignition off. Disconnect PCM 104-pin connector, and inspect for damaged pins, corrosion and loose wires. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Connect DVOM between ground and test pin No. 41 at breakout box. While observing DVOM, wiggle and bend small sections of wiring harness staring at A/C clutch connector and working toward PCM. If voltage is ever present, locate and repair short to power. If voltage is never present, no problem is indicated at this time.
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