Test Ag: Incorrect Fuel Gauge Reading In Gasoline Mode (Bi-Fuel Only)
- Turn ignition switch to LOCK position. Disconnect alternative fuel intercept 16-pin in-line connector C4302. Alternative fuel intercept 16-pin in-line connector C4302 is located below center of vehicle, near fuel tank. Disconnect fuel tank assembly 16-pin harness connector C1045. Connect gasoline fuel tank assembly C1045 (component side) to alternative fuel intercept 16-pin in-line 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, repair wiring harness as necessary between alternative fuel intercept 16-pin in-line connector C4302 and gasoline fuel tank assembly 16-pin harness connector C1045. See WIRING DIAGRAMS . Retest system operation.
- Turn ignition switch to LOCK position. Disconnect compuvalve 64-pin harness connector C4025. Compuvalve is located in left rear of engine compartment, on top of engine. Measure resistance between compuvalve 64-pin harness connector C4025 terminal No. 42 (White wire) and alternative fuel pump intercept 16-pin in-line connector C4302 terminal No. 4 (Dark Blue wire). See Figure and Fig 1
. Measure resistance between ground and compuvalve 64-pin harness connector C4025 terminal No. 42 (White wire). If resistance is 5 ohms or less between compuvalve 64-pin harness connector C4025 and alternative fuel pump intercept 16-pin in-line connector C4302, or more than 10 k/ohms between ground and compuvalve 64-pin harness connector C4025, go to next step. If resistance is more than 5 ohms between compuvalve 64-pin harness connector C4025 and alternative fuel pump intercept 16-pin in-line connector C4302 and less than 10 k/ohms between ground and compuvalve 64-pin harness connector C4025, replace compuvalve. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. Retest system operation.
- Turn ignition switch to ON position. Measure voltage between ground and compuvalve 64-pin harness connector C4025 terminal No. 42 (White wire). If battery voltage is present, repair short to power in White wire between compuvalve and fuel tank assembly. Retest system operation. If battery voltage is not present, replace compuvalve. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. Retest system operation.
Courtesy of FORD MOTOR CO.