Inspection Procedure
NOTE:
- If DTC P0115, P0116, P0117, P0118 and P0125 are output simultaneously, engine coolant temperature sensor circuit may be open or short. Perform the troubleshooting of DTC P0115, P0117 or P0118 first.
- Read freeze frame data using the hand-held tester or the OBDII scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.
- Are there any other codes (besides DTC P0125) being output?
PREPARATION:
- Connect the hand-held tester or the OBD II scan tool to the DLC3.
- Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON.
- When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES.
CHECK:
Read the DTCs using the hand-held tester or the OBD II scan tool.
RESULT:
DTC OUTPUT DISPLAYDisplay (DTC output) Proceed to P0125 A "P0125" and other DTCs B NOTE:If any other codes besides P0125 are output, perform the troubleshooting for those DTCs first.
- B: Go to relevant DTC chart (See DIAGNOSTIC TROUBLE CODE CHART ).
- A: Go to next step.
- Inspect thermostat (See
INSPECTION
).
- NG: Replace thermostat (See REMOVAL ).
- OK: Go to next step.
- Check cooling system.
CHECK:
Check that there is detect in the cooling system which causes overcool, such as abnormal radiator fan operation, modified cooling system and so on.
- NG: Repair or replace cooling system.
- OK: Replace engine coolant temperature sensor.