Diagnostic Aids
After engine is started, temperature should rise steadily to about 203°F (95°C) and stabilize when thermostat opens.
Ensure engine is not overheating and has not been subjected to conditions which would create an overheating condition (i.e., overload, trailer towing, heavy stop and go traffic, etc.).
When replacing TPS, check COOLANT TEMPERATURE SENSOR RESISTANCE table. A "shifted" sensor could result in poor driveability complaints.
COOLANT TEMPERATURE SENSOR RESISTANCE
| Temperature °F (°C) | Ohms |
|---|---|
| 210 (99) | 190 |
| 160 (71) | 400 |
| 100 (38) | 1250 |
| 70 (21) | 2350 |
| 40 (4) | 4780 |
| 20 (-7) | 8100 |
| 0 (-18) | 14,650 |