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Test Ac: Incorrect Fuel Gauge Reading In Alternative Fuel & Gasoline Mode (Bi-Fuel Only)

  1. Turn ignition switch to LOCK position. Disconnect alternative fuel intercept harness connector C4302 and fuel pump module connector C1045. Connect gasoline fuel pump module C1045 to harness connector C4302. Toggle alternative fuel mode select switch to gasoline mode. If fuel gauge functions correctly, go to next step. If fuel gauge does not function correctly, go to step  4.
  2. Turn ignition switch to LOCK position. Disconnect compuvalve harness connector C4025. Measure resistance between terminal No. 43 (White wire) at compuvalve harness connector C4025 and terminal No. 4 (Dark Blue/Yellow wire) at fuel pump harness connector C4302. Measure resistance between ground and terminal No. 43 (White wire) at compuvalve harness connector C4025. See Figure. If resistance is 5 ohms or less between compuvalve and fuel pump intercept harness and more than 10 k/ohms between compuvalve and ground, go to next step. If resistance is more than 5 ohms between compuvalve and fuel pump intercept harness and less than 10 k/ohms between compuvalve and ground, repair open or short to ground in White wire and retest.
  3. Turn ignition switch to RUN position. Measure voltage between ground and terminal No. 43 (White wire) at compuvalve harness connector C4025. If battery voltage is present, repair short to power in White wire and retest. If battery voltage is not present, replace compuvalve. See appropriate REMOVAL, OVERHAUL & INSTALLATION - CNG/LPG article in ENGINE PERFORMANCE.
  4. Turn ignition switch to LOCK position. Disconnect instrument cluster connector C250b and fuel pump intercept harness C4302. Measure resistance of Yellow/White wire between terminal No. 10 at instrument cluster harness connector C250b and terminal No. 4 at fuel pump intercept harness C4302. Measure resistance between ground and terminal No. 10 (Yellow/White wire) at instrument cluster harness connector C250b. If resistance is 5 ohms or less between instrument cluster and fuel pump intercept and more than 10 k/ohms between instrument cluster and ground, go to next step. If resistance is more than 5 ohms between instrument cluster and fuel pump intercept and less than 10 k/ohms between instrument cluster and ground, repair Yellow/White wire for an open or short to ground and retest.
  5. Turn ignition to RUN position. Measure voltage between ground and terminal No. 10 (Yellow/White wire) at instrument cluster harness connector C250b. See Figure. If battery voltage is present, repair short to power in Yellow/White wire and retest. If battery voltage is not present, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION.
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