SYMPTOM TROUBLESHOOTING [L3 WITH TC]
01-03–61
01-03
End Of Sie
NO.18 COOLING SYSTEM CONCERNS-RUNS COLD[L3 WITH TC]
id010339802400
Diagnostic procedure
9
Cool down the engine.
Remove the thermostat and inspect operation.
(See01-12-11 THERMOSTAT REMOVAL/
INSTALLATION[L3 WITH TC].)
(See01-12-11 THERMOSTAT INSPECTION[L3
WITH TC].)
Is thermostat normal?
Yes
Thermostat is normal.
Inspect the cylinder block for leakage or blockage.
No
Access the ECT PID using the M-MDS.
Inspect for both ECT PID and temperature gauge
readings.
If the temperature gauge on instrument cluster
indicates normal but ECT PID is not same as
temperature gauge reading, inspect the ECT sensor.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
If the temperature gauge on instrument cluster
indicates overheating but ECT PID is normal, inspect
the instrument cluster.
(See09-22-3 INSTRUMENT CLUSTER INSPECTION.)
10
Verify test results.
• If normal, return to the diagnostic index to service any additional symptoms.
• If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the
repair or diagnosis.
— If the vehicle is repaired, troubleshooting is completed.
— If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later
calibration is available. Retest.
STEP
INSPECTION
RESULTS
ACTION
18
COOLING SYSTEM CONCERNS - RUNS COLD
DESCRIPTION
Engine takes excessive time to reach normal operating temperature.
POSSIBLE CAUSE
• Thermostat malfunction
• Condenser fan system malfunction
• Cooling fan system malfunction
STEP
INSPECTION
RESULTS
ACTION
1
Is customer complaint “Lack of passenger
compartment heat” only?
Yes
Inspect the A/C heater system.
No
Go to the next step.
2
Does the engine speed continue at fast idle?
Yes
Go to symptom troubleshooting “NO.9 FAST IDLE/
RUNS ON.”
(See01-03-37 NO.9 FAST IDLE/RUNS ON[L3 WITH
TC].)
No
Go to the next step.
3
Cool down the engine.
Remove the thermostat and inspect operation.
(See01-12-11 THERMOSTAT REMOVAL/
INSTALLATION[L3 WITH TC].)
(See01-12-11 THERMOSTAT INSPECTION[L3
WITH TC].)
Is thermostat normal?
Yes
Go to the next step.
No
Replace the thermostat.
4
Perform the Cooling Fan Control System
Operation Inspection.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
Does the cooling fan system operate properly?
Yes
Access the ECT PID using the M-MDS.
Inspect for both ECT PID and temperature gauge
readings.
If the temperature gauge on instrument cluster
indicates normal but ECT PID is not same as
temperature gauge reading, inspect the ECT sensor.
(See01-40-25 ENGINE COOLANT TEMPERATURE
(ECT) SENSOR INSPECTION[L3 WITH TC].)
If the temperature gauge on instrument cluster
indicates overheating but ECT PID is normal, inspect
the instrument cluster.
(See09-22-3 INSTRUMENT CLUSTER INSPECTION.)
No
Repair or replace malfunctioning part, according to
inspection results.
1871-1U-06B(01-03).fm 61 ページ 2006年3月15日 水曜日 午前10時36分