Instrument Cluster Gauge Tests
- Before removing instrument cluster to check a suspected faulty gauge, perform this test. Locate and disconnect harness connector from suspected faulty gauge sending unit. Ground sending unit harness connector using 12-volt test light with 3.4-watt bulb. Turn ignition on. Test light should illuminate slightly and suspect gauge needle should move.
- If test light comes on but gauge needle DOES NOT move, replace gauge. If test light does not come on and gauge needle does not move, check for blown fuse No. 11. Also check for open in sender wiring circuit, or check for excessive resistance between gauge terminals.
- To check for excessive resistance in gauge, remove instrument cluster to gain access to gauge. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. To prevent false reading, remove ignition terminal screw/nut from area "A" on fuel and temperature gauges. See Fig 1 . On all gauges, use ohmmeter to measure resistance between specified gauge terminals listed in GAUGE RESISTANCE . Replace gauge if readings are not as specified.
GAUGE RESISTANCE
| Gauge & Terminals | Ohms | |
|---|---|---|
| Fuel Gauge | ||
| A-B | 230 | |
| A-C | 102 | |
| B-C | 102 | |
| Oil Pressure Gauge | ||
| A-B | 42 | |
| Temperature Gauge | ||
| A-B | 130 | |
| A-C | 53 | |
| B-C | 162 | |
| Turbo Boost Gauge | ||
| A-B | 72 | |