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Fuel Injector Circuit

  1. Turn ignition off. Pull back the right front floor mat. Remove ECM protective cover. Connect Check Harness (09990-01000) between ECM and harness. See USING CHECK HARNESS  under INTRODUCTION. Turn ignition on.
  2. Measure voltage between chassis ground and terminals No. 15-20 of ECM connector "B". To identify ECM connectors and terminals, see Figure.
  3. If battery voltage is measured at all terminals, go to next step. If battery voltage is not measured at all terminals, check AM2 fuse (30-amp) and INJ fuse (30-amp). See COMPONENT LOCATIONS  under INTRODUCTION. If fuse(s) are blown, repair short circuit. If fuses are okay, repair harness between ECM and battery.
  4. Check for continuity between chassis ground and terminals No. 79 and 80 (White/Black wires) of ECM connector "B". If continuity does not exist, repair open White/Black wires. If continuity exists, measure injector resistance and volume. See FUEL INJECTOR RESISTANCE  and FUEL INJECTOR VOLUME . If resistance and volume are as specified, replace ECM.
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