Test Ai: Instrument Cluster Inoperative (Bi-Fuel Only)

Disconnect 2-pin in-line connector C4082 located behind right side of instrument cluster. Connect a 10-amp fused jumper wire between 2-pin in-line connector C4082 (male side) terminals No. 1 (Red/Yellow wire) and No. 2 (Red/Yellow wire). Turn ignition switch to ON position. If fuel gauge operates, go to next step. If fuel gauge does not operate, go to step 5.
Turn ignition switch to LOCK position. Remove dash reset relay from 5-pin harness connector C4204 located in right rear of engine compartment. Perform dash reset relay component test. See DASH RESET RELAY (MINI-ISO) in COMPONENT TESTS. If relay is okay, leave relay removed and go to next step. If relay is not okay, replace relay. 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. Remove dash reset relay from 5-pin harness connector C4204 located in right rear of engine compartment. Disconnect 2-pin in-line connector C4082. Measure resistance between specified circuits. See INSTRUMENT CLUSTER CIRCUITRY RESISTANCE table. If resistance values are less than 5 ohms, between compuvalve 64-pin harness connector C4025 and dash reset relay 5-pin harness connector C4204, and between dash reset relay 5-pin harness connector C4204 and 2-pin in-line connector C4082, and more than 10 k/ohms between ground and specified terminals, go to next step. If resistance values are more than 5 ohms, between compuvalve 64-pin harness connector C4025 and dash reset relay 5-pin harness connector C4204, and between dash reset relay 5-pin harness connector C4204 and 2-pin in-line connector C4082 and/or less than 10 k/ohms between ground and specified terminals, repair open or short between appropriate wires. See WIRING DIAGRAMS . Retest system operation.

INSTRUMENT CLUSTER CIRCUITRY RESISTANCE

Compuvalve 64-Pin Harness Connector C4025 ⁽¹⁾

Dash Reset Relay 5-Pin Harness Connector C4204 ⁽²⁾

⁽²⁾ 2-Pin In-Line Connector C4082

Terminal No. 9 (White Wire)

Terminal No. 86 (Red Wire)

N/A

Terminal No. 9 (White Wire) ⁽³⁾

N/A

Terminal No. 15 (White Wire)

Terminal No. 85 (White Wire)

N/A

Terminal No. 15 (White Wire) ⁽³⁾

N/A

Terminal No. 30 (Red/Yellow Wire)

Terminal No. 2 (Red/Yellow Wire)

N/A

Terminal No. 87A (Red/Yellow Wire)

Terminal No. 1 (Red/Yellow Wire)

N/A

⁽³⁾ Terminal No. 1 (Red/Yellow Wire)

N/A

⁽³⁾Terminal No. 2 (Red/Yellow Wire)

⁽¹⁾	See Figure.

⁽²⁾	Connector illustration is not available from manufacturer.

⁽³⁾	Test circuit between ground and specified terminal.

Turn ignition switch to ON position. Measure voltage between ground and compuvalve 64-pin harness connector C4025 terminals No. 9 and 15 (White wires). Measure voltage between 2-pin in- line harness connector C4082 terminals No. 1 and 2 (Red/Yellow wires). If battery voltage is present, repair White and/or Red/White wire(s) for short to power between instrument cluster and bi-fuel module. See WIRING DIAGRAMS . Retest system operation. If battery voltage is not present, replace compuvalve. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE.
Turn ignition switch to LOCK position. Remove instrument cluster to gain access to instrument cluster harness connectors. See REMOVAL & INSTALLATION . Disconnect instrument cluster 16-pin harness connector C250B. Turn ignition switch to ON position. Using a 10-amp fused jumper wire, measure voltage between ground and instrument cluster 16-pin harness connector C250B terminal No. 6 (Red/Yellow wire). See Figure. If battery voltage is present, replace instrument cluster. Retest system operation. If battery voltage is not present, repair open in Red/Yellow wire between instrument cluster and central junction box. See WIRING DIAGRAMS . Retest system operation.