Coolant & Oil Temperature Diagnosis
- Disconnect temperature sender wire in engine compartment and connect tester (J-33431). Turn on ignition. Set tester resistance controls to values shown in table. Readings should be as shown.
- If gauge responds to tester accurately, replace sender. If not, disconnect temperature gauge lead at engine harness connector at bulkhead. Connect signal generator tester to lead going to gauge.
- If gauge responds to tester accurately, check wiring between sender connector and engine harness connector. If gauge does not respond, remove cluster. Check for proper readings and voltages. See Voltage and Resistance Check charts. If okay, replace cluster. If not okay, repair connection or wire to sender. Reinstall cluster.
TEST VALUES FOR OIL TEMP. DISPLAY
| Resistance Settings | Display Readings °F (°C) | Warning Indicator |
|---|---|---|
| 570 ohms | "LO" | OFF |
| 461 ohms | 150 (66) | OFF |
| 135 ohms | 220 (104) | OFF |
| 81 ohms | 255 (124) | OFF |
| 47 ohms | 300 (149) | ON |
TEST VALUES FOR COOLANT TEMPERATURE DISPLAY
| Resistance Settings | Display Readings °F (°C) | Warning Indicator |
|---|---|---|
| 1400 ohms | "LO" | OFF |
| 1320 ohms | 100 (40) | OFF |
| 254 ohms | 180 (82) | OFF |
| 135 ohms | 220 (104) | OFF |
| 81 ohms | 255 (124) | ON |