Coolant Temperature Indicator
- Turn ignition on (engine off). If indicator light does not come on, go to next step. If indicator light comes on, start engine and check indicator light. If indicator remains on, go to step 4). If indicator goes out, check sensor resistance. See COOLANT TEMPERATURE SENSOR RESISTANCE SPECIFICATIONS table. Replace sensor if resistance is not correct.
- Backprobe a test light to Green PCM connector terminal C7 (Pink/Black wire). Connect other test light probe to battery voltage. If test light comes on, go to next step. If test light does not come on, check for poor connection at PCM. If connection is okay, replace PCM.
- Backprobe test light at instrument cluster connector terminal A1 (Pink/Black wire). See Figure . Connect other test light probe to battery voltage. If test light does not come on, repair open in Pink/Black wire. If test light comes on, check for poor connection at cluster or blown indicator bulb. If bulb and connection are okay, replace instrument cluster.
- If coolant temperature is less than 255°F (124°C), go to next step. If coolant temperature is greater than 255°F (124°C), check sensor resistance. See COOLANT TEMPERATURE SENSOR RESISTANCE SPECIFICATIONS table. Replace sensor if resistance is not correct.
- Turn ignition off. Disconnect Green PCM connector. Turn ignition on. Connect a test light between battery voltage and PCM connector terminal C7 (Pink/Black wire). If test light comes on, repair short to ground in Pink/Black wire between instrument panel and PCM. If test light does not come on, replace PCM.
COOLANT TEMPERATURE SENSOR RESISTANCE SPECIFICATIONS
| Temperature °F (°C) | Ohms |
|---|---|
| 212 (100) | 177 |
| 194 (90) | 241 |
| 176 (80) | 332 |
| 158 (70) | 467 |
| 140 (60) | 667 |
| 122 (50) | 973 |
| 104 (40) | 1459 |
| 86 (30) | 2238 |
| 68 (20) | 3520 |
| 50 (10) | 5670 |
| 32 (0) | 9420 |
| 14 (-10) | 16,180 |
| -4 (-20) | 28,680 |
| -22 (-30) | 52,700 |
| -40 (-40) | 100,700 |