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Pinpoint Test G: No Module Communications

  1. Check Fuse

    Turn ignition off. Remove and inspect fuse No. 9 (10-amp) from instrument panel fuse block. If fuse is blown, go to next step. If fuse is okay, go to step 3).

  2. Check For Short To Ground In Circuit No. 601

    Disconnect 28-pin connector from ECU. Measure resistance between terminal No. 14 (Light Blue/Pink wire) at ECU 28-pin connector and body ground. See Figure . If resistance is more than 10,000 ohms, replace ABS control module. If resistance is less than 10,000 ohms, repair short to ground in Light Blue/Pink wire. Replace fuse if necessary. Reconnect all components, clear codes and recheck system operation.

  3. Check Voltage Input To ABS Control Module

    Disconnect 28-pin connector from ECU. Turn ignition on. Measure voltage between terminal No. 14 (Light Blue/Pink wire) at ECU 28-pin connector and body ground. If voltage is 10 volts or more, go to step 5). If voltage is less than 10 volts, go to next step.

  4. Check For Open In Circuit No. 601

    Turn ignition off. Disconnect 22-pin connector from instrument panel fuse block. Measure resistance between terminal No. 17 (Light Blue/Pink wire) at fuse block 22-pin connector and terminal No. 14 (Light Blue/Pink wire) at ECU 28-pin connector. See Figure and Figure . If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open Light Blue/Pink wire. Reconnect all components, clear codes and recheck system operation.

  5. Check For Open In Circuit No. 570

    Turn ignition off. Measure resistance between terminal Nos. 1 and 21 at ECU 28-pin connector. See Figure . If resistance is 5 ohms or less, refer to MODULE COMMUNICATIONS NETWORK article. If resistance is 5 ohms or more, repair open Black/White wire. Reconnect all components, clear codes and recheck system operation.
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