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Diagnostic Aids

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  1. 1) DTC 1660

    This DTC indicates that output circuit check is high. Possible causes for this DTC are:
    • High system voltage.
    • VREF circuit fault.
    • Faulty Powertrain Control Module (PCM).

    Perform charging system and battery tests. See appropriate STARTING & CHARGING SYSTEMS article in ACCESSORIES & EQUIPMENT. Repair as necessary. If charging system is okay, go to next step.

  2. 2) Check VREF Circuit

    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. 90 at breakout box. If voltage is less than .25 volt, go to next step. If voltage is .25 volt or more, locate and repair short to power in VREF circuit (Brown/White wire). Clear DTCs, and repeat QUICK TEST .

  3. 3) Check PCM

    Reconnect PCM connector. Perform KOEO SELF-TEST . If DTC 1660 is still present, replace PCM. Clear DTCs, and repeat QUICK TEST . If DTC 1660 is not present, no problem is indicated at this time.
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