Diagnostic Test Mode No. 3

Control module can check operation of some instruments by generating a display signal which can indicate whether a particular gauge or meter is defective. To activate diagnostic test mode No. 3, briefly press test button 3 times. ECU will activate gauges, meters, and illuminate LEDs for 30-60 seconds throughout test. Gauges and meters should indicate as follows:
- Fuel gauge needle should indicate 1/2 full.
- Temperature gauge needle should be at edge of Red section.
- Speedometer needle should be vertical.
- Trip meter should indicate an extra .5 mile.
- Tachometer needle should be vertical.
If gauges and meters indicate correct values during function test but incorrect values during test drive, fault is present in wiring or one of the sensors connected to instrument cluster.

INSTRUMENT CLUSTER DIAGNOSTIC FAULT CODES (1995)

Code	Problem	Reference
1-1-1	No Faults Located	None
1-1-2	Fuel Gauge/Short Circuit In Sensor	See FUEL GAUGE TEST
1-1-3	Fuel Gauge/Open Circuit In Sensor	See FUEL GAUGE TEST
1-2-1	Temperature Sensor/Interval Too Short	See TEMPERATURE GAUGE TEST
1-2-2	Temperature Sensor/Interval Too Long	See TEMPERATURE GAUGE TEST
1-2-3	Incorrect 48-Pulse Signal	See SPEEDOMETER TEST
1-3-1	Incorrect 12-Pulse Connector	See SPEEDOMETER TEST
1-3-2	Engine Speed Sensor Signal Incorrect	See TACHOMETER TEST
1-3-3	Tank Signal To Trip Computer Incorrect	Replace Instrument Cluster. See INSTRUMENT CLUSTER