Diagnostic Index: Instrumentation

DETECTION CONDITION AND POSSIBLE CAUSE

15	INSTRUMENTATION
DESCRIPTION	Tachometer and/or fuel gauge inoperative

INSTRUMENTATION INSPECTION

STEP	INSPECTION		ACTION
1	PRELIMINARY CHECKS Check all electrical connections. Are connections OK?	Yes	Go to step 2.
1		No	Service as required. Verify symptom no longer exists.
2	IS THE SYMPTOM; FUEL GAUGE INOPERATIVE? Is symptom "fuel gauge inoperative"?	Yes	Go to step 6.
2		No	Go to step 3.
3	CHECK INSTRUMENTATION See COMPONENT TESTS in INSTRUMENT PANELS article in Accessories & Equipment. Is a fault indicated?	Yes	Service as required.
3		No	Go to step 4.
4	PERFORM KOEO SELF TEST. ALSO RETRIEVE ANY CONTINUOUS MEMORY DTCS Are any DTCs displayed during Continuous Memory or Key ON, Engine OFF (KOEO) Self Tests?	Yes	Check for cause. See DIAGNOSTIC TROUBLE CODE NUMBERS .
4		No	If tachometer is inoperative: See TEST G: TACHOMETER INOPERATIVE , then Go to step 5. All others: Verify test results. See DIAGNOSTIC INDEX to repair any additional symptoms.
5	CHECK CLEAN TACH OUTPUT CIRCUIT FROM PCM See TEST 2: TACHOMETER OUTPUT (CTO) FAILURE Is a fault indicated?	Yes	Service as required.
5		No	Go to step 7
6	PERFORM KOEO SELF TEST. ALSO RETRIEVE ANY CONTINUOUS MEMORY DTCS Are any DTCs displayed during Continuous Memory or Key ON, Engine OFF (KOEO) Self Tests?	Yes	Check for cause. See DIAGNOSTIC TROUBLE CODE NUMBERS .
6		No	See TEST A: FUEL GAUGE INACCURATE in INSTRUMENT PANELS article in Accessories & Equipment to service the inoperative fuel gauge
7	Verify results. If OK, See DIAGNOSTIC INDEX to service any additional symptoms