No.17 Cooling System Concerns-Overheating: Notes
DESCRIPTION & POSSIBLE CAUSE
| 17 |
COOLING SYSTEM CONCERNS-OVERHEATING |
| DESCRIPTION |
- Engine runs at higher than normal temperature/overheats.
|
| POSSIBLE CAUSE |
- Engine heat generation amount is too large
- Engine speed is high and remains high for continuous long periods
- PCM DTC is stored
- Improper indication of low engine coolant temperature indicator light and/or high engine coolant temperature warning light
- ECT sensor No.1 malfunction
- Instrument cluster malfunction
- Improper operation of A/C system
- Cooling fan inoperative
- Improper engine coolant level
- Coolant leakage (engine internal, external)
- Engine coolant performance deterioration
- Improper water/anti-freeze mixture
- Poor radiator condition
- Radiator hose damage
- Improper or damaged radiator cap
- Coolant overflow system malfunction
- Fans reverse rotation
- Blown fuse
- Leakage at coolant hoses and/or radiator
- Leakage around heater unit in passenger compartment
- Drive belt damage
- Improper drive belt tension
- Thermostat malfunction
- Excessive A/C system pressure
|
CAUTION:
- Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.
RELATED PIDs DESCRIPTION
| Monitor item (Definition) |
Unit/Condition |
Condition/Specification (Reference) |
| ECT |
°C, °F |
|
| V |
- ECT is 20°C {68°F}: approx. 3.10 V
- ECT is 40°C {104°F}: approx. 2.16 V
- ECT is 60°C {140°F}: approx. 1.40 V
- ECT is 80°C {176°F}: approx. 0.87 V
- ECT is 100°C {212°F}: approx. 0.54 V
|