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Fuel Injector Circuit

WARNING: This page is about a different car, the 1995 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Pull back the right front floor mat. Remove ECM protective cover. Connect a 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 present at all terminals, go to next step. If battery voltage is not present at all terminals, check IG2 (ignition main) relay. See RELAYS  under MODULES, MOTORS, RELAYS & SOLENOIDS. If IG2 relay is okay, repair harness between IG2 relay 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, check for open circuits between IG2 relay and injectors, and between injectors and ECM.
  5. If circuits are okay, 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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