ENGINE OVER TEMPERATURE (OVERHEAT) - ECM Terminals and Reference Value / Overall Function Check
EF & EC-7220prose procedureECM Terminals and Reference Value
Specification data are reference values and are measured between each terminal and ground.
CAUTION
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a gro[u]nd other than ECM terminals, such as the ground.
22
WIRE COLORR/W
ITEMCooling fan relay
CONDITION[Engine is running] Cooling fan is not operating
DATA (DC Voltage)BATTERY VOLTAGE (11 - 14V)
22
WIRE COLORR/W
ITEMCooling fan relay
CONDITION[Engine is running] Cooling fan is operating
DATA (DC Voltage)0 - 0.6V
64
WIRE COLORY/R
ITEMAir conditioner switch
CONDITION[Engine is running] Both air conditioner switch and blower switch are "ON" (Compressor operates)
DATA (DC Voltage)Approximately 0V
64
WIRE COLORY/R
ITEMAir conditioner switch
CONDITION[Engine is running] Air conditioner switch is "OFF"
DATA (DC Voltage)BATTERY VOLTAGE (11 - 14V)
76
WIRE COLORLG/R
ITEMFan switch
CONDITION[Engine is running] Fan switch is "ON"
DATA (DC Voltage)More than 1.5V
76
WIRE COLORLG/R
ITEMFan switch
CONDITION[Engine is running] Fan switch is "OFF"
DATA (DC Voltage)Voltage is decreasing gradually
Overall Function Check
Use this procedure to check the overall function of the cooling fan. During this check, a DTC might not be confirmed.
WARNING
Never remove the radiator cap when the engine is hot. Serious burns could be caused by high pressure fluid escaping from the radiator. Wrap a thick cloth around cap. Carefully remove the cap by turning it a quarter turn to allow built-up pressure to escape. Then turn the cap all the way off.
With CONSULT-II
- 1Check the coolant level in the reservoir tank and radiator. Allow engine to cool before checking coolant level. If the coolant level in the reservoir tank and/or radiator is below the proper range, skip the following steps and go to "Diagnostic Procedure", EC-7225.
- 2Confirm whether customer filled the coolant or not. If customer filled the coolant, skip the following steps and go to "Diagnostic Procedure", EC-7225.
- 3Turn ignition switch "ON".
- 4Perform "COOLING FAN" in "ACTIVE TEST" mode with CONSULT-II.
- 5If the results are NG, go to "Diagnostic Procedure", EC-7225.