Diagnostic Test
- INSPECTION START
Does the coolant temperature rise too quickly and become too high?
YES
GO TO STEP 2 .
NO
GO TO STEP 3 .
- CHECK COOLANT THERMOSTAT HEATING ELEMENT
With CONSULT
- Turn ignition switch ON.
- On CONSULT screen, select "ENGINE" >> "ACTIVE TEST" >> "CHECK COOLANT THERMOSTAT HEATING ELEMENT".
- Set the vehicle under the following conditions:CAUTION:
During the test, cooling fan is activated at maximum speed.
Item Condition Vehicle speed At idle Engine coolant temperature Less then 100°C (122°F) A/C OFF - Perform the Active Test.NOTE:
- When a coolant temperature reaches between 92°C (198°F) and 100°C (212°F), the test is started automatically.
- The test takes up to approximately 10 minutes.
Is the inspection result normal?
YES
GO TO STEP 7 .
NO
GO TO STEP 4 .
- CHECK COOLANT THERMOSTAT HEATING ELEMENT
- Turn ignition switch ON.
- On CONSULT screen, select "ENGINE" >> "ACTIVE TEST" >> "CHECK COOLANT THERMOSTAT HEATING ELEMENT".
- Set the vehicle under the following conditions:CAUTION:
During the test, cooling fan is activated at maximum speed.
Item Condition Vehicle speed At idle Engine coolant temperature Less then 50°C (122°F) A/C OFF - Perform the Active Test.NOTE:
- When a coolant temperature reaches between 65°C (149°F) and 70°C (158°F), the test is started automatically.
- The test takes up to approximately 10 minutes.
Is the inspection result normal?
YES
GO TO STEP 7 .
NO
GO TO STEP 4 .
- CHECK COOLANT THERMOSTAT HEATER ELEMENT
Check engine coolant thermostat heating element. Refer to COMPONENT INSPECTION (COOLANT THERMOSTAT HEATER ELEMENT) .
Is the inspection result normal?
YES
GO TO STEP 5 .
NO
Replace error-detected parts.
- CHECK ENGINE COOLANT THERMOSTAT HEATER ELEMENT POWER SUPPLY
- Check that the #214 fuse is not blowing.
- Disconnect coolant thermostat heater element harness connector.
- Turn ignition switch ON.
- Check the voltage between coolant thermostat heater element harness connector and ground.
+ - Voltage Coolant thermostat heater element Connector Terminal F151 2 Ground Battery voltage
Is the inspection result normal?
YES
GO TO STEP 6 .
NO
Check engine coolant thermostat heating element power supply circuit.
- CHECK COOLANT THERMOSTAT HEATER ELEMENT CONTROL CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between ECM harness connector and coolant thermostat heater element harness connector.
+ - Continuity ECM Coolant thermostat heater element Connector Terminal Connector Terminal F149 4 F151 1 Existed - Also check harness for short to ground.
Is the inspection result normal?
YES
Check intermittent incident. Refer to INTERMITTENT INCIDENT .
NO
Repair or replace error-detected parts.
- CHECK ENGINE COOLANT TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Disconnect engine coolant temperature sensor harness connector.
- Turn ignition switch ON.
- Check the voltage between engine coolant temperature sensor harness connector terminals.
Engine coolant temperature sensor Voltage Connector + - Terminal F133 2 1 4.75 - 5.25 V
Is the inspection result normal?
YES
GO TO STEP 9 .
NO
GO TO STEP 8 .
- CHECK ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between engine coolant temperature sensor harness connector and ECM harness connector.
+ - Continuity ECM Engine coolant temperature sensor Connector Terminal Connector Terminal F149 11 F133 1 Existed 86 2 - Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
Check ECM power supply circuit. Refer to DIAGNOSIS PROCEDURE .
NO
Repair or replace error-detected parts.
- CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to COMPONENT INSPECTION (ENGINE COOLANT TEMPERATURE SENSOR) .
Is the inspection result normal?
YES
GO TO STEP 10 .
NO
Replace engine coolant temperature sensor. Refer to COMPONENT LOCATION .
- CHECK INTERMITTENT INCIDENT
Refer to INTERMITTENT INCIDENT .
INSPECTION END