DESCRIPTION
INSPECTION PROCEDURE
CHECK FOR ENGINE COOLANT LEAKS
CHECK ENGINE COOLANT QUALITY
INSPECT THERMOSTAT
INSPECT WATER PUMP ASSEMBLY
DTC 012 Overheating
DTC 014 Difference Evaluation Overheating
DTC 017 Hardware Overheating
DESCRIPTION
| DTC No. | DTC Detection Condition | Trouble Area |
| 012 |
The surface sensor or control overheating sensor detects a temperature of 125°C (257°F) or more. |
Surface sensor (combustion heater assembly)
Control overheating sensor (combustion heater assembly)
Engine coolant circuit (for leaks, engine coolant quality, thermostat, water pump assembly)
|
| 014 |
When the engine coolant temperature is 80°C (176°F) and the combustion heater assembly is operating, the difference in temperatures detected by the surface sensor and control overheating sensor is 25°C (77°F) or more. |
Surface sensor (combustion heater assembly)
Control overheating sensor (combustion heater assembly)
Engine coolant circuit (for leaks, engine coolant quality, thermostat, water pump assembly)
|
| 017 |
When neither DTC 012 nor 014 is detected, the control overheating sensor or surface sensor detects a temperature of 130°C (266°F). |
Control overheating sensor (combustion heater assembly)
Surface sensor (combustion heater assembly)
Engine coolant circuit (for leaks, engine coolant quality, thermostat, water pump assembly)
|
INSPECTION PROCEDURE
| 1.CHECK FOR ENGINE COOLANT LEAKS |
Check for engine coolant leaks .
| | REPAIR ENGINE COOLANT LEAKS |
|
|
| 2.CHECK ENGINE COOLANT QUALITY |
Check the engine coolant quality .
| 4.INSPECT WATER PUMP ASSEMBLY |
Inspect the water pump assembly .
| | REPLACE WATER PUMP ASSEMBLY |
|
|
| OK | |
| |
| REPLACE COMBUSTION HEATER ASSEMBLY |
|
LEXUS IS250, IS220d / GSE20 ALE20