Check MAF
Ignition "OFF"
Disconnect ECTS connector.
Monitor resistance between terminal 1 and 3 of ECTS connector(Component Side).
Is the measured resistance within specifications?
YES
▶ Go to "Check thermostat " as below.
NO
▶ Substitute with a known-good ECTS and check for proper operation.
If the problem is corrected, replace ECTS and then go to "Verification of Vehicle Repair" procedure.
Check Thermostat
Engine "ON"
This test should be performed under cold temperature.
Remove radiator cap.
Warm up the engine to normal operating temperature.
Check that engine coolant circulates.
Does engine coolant circulate ?
YES
▶ Substitute with a known-good ECM and check for proper operation.
If the problem is corrected, replace ECM and then go to "Verification of Vehicle Repair" procedure.
NO
▶ Substitute with a known-good Thermostat and check for proper operation.
If the problem is corrected, replace thermostat and then go to "Verification of Vehicle Repair" procedure.
