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Ecu Power Supply & Ground Tests: JUSTY

  1. Check ECU Power Supply Circuit  - Turn ignition on. Verify at least 9 volts between ECU 22-pin connector terminals No. 1 (Red wire) and ground, No. 2 (White/Blue wire) and ground, and No. 12 (Red wire) and ground. If at least 9 volts are present, go to next step. If at least 9 volts are not present, repair harness or connectors as necessary.
  2. Check ECU Ground Circuit  - Turn ignition off. Verify less than 10 ohms harness resistance between ECU 22-pin connector terminal No. 10 (Black/Red wire) and ground, between ECU 16-pin connector terminals No. 1 (Black/Green wire) and ground, and No. 2 (Black/Green wire) and ground, and between 26-pin connector terminals No. 1 (Black/Red wire) and ground, No. 13 (Black/Blue wire) and ground, and No. 26 (Black/Blue wire) and ground. If less than 10 ohms are present, see JUSTY under IGNITION CONTROL SYSTEM TESTS  . If resistance is more than 10 ohms, repair harness or connectors as necessary.
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