Diagnostic procedure

COOLING SYSTEM CONCERNS-OVERHEATING - DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	Inspect following: Engine coolant level Coolant leakage Water and anti-freeze mixture Radiator condition Collapsed or restricted radiator hoses Radiator pressure cap Overflow system Fan rotational direction Fuses Are all items okay?	Yes	Go to next step.
1		No	Service as necessary. Repeat Step 1.
2	Connect WDS or equivalent to DLC-2. Turn ignition key to ON (Engine OFF). Retrieve any DTCs. Is "PASSED" displayed?	Yes	No DTC is displayed: Go to next step.
2		No	DTC is displayed: Go to appropriate DTC test.
3	Start engine and run it at idle speed. Turn A/C switch on. Does A/C compressor engage?	Yes	Go to step 5.
3		No	Inspect following and repair or replace as necessary: Refrigerant charging amount Open circuit between A/C relay and PCM terminal 47 Seized A/C magnetic clutch A/C magnetic clutch malfunction If all items are okay, Inspect following: Refrigerant pressure switch operation Evaporator temperature sensor and A/C amplifier A/C switch is stuck open. Open or short circuit between refrigerant pressure switch and PCM terminal 5 Open circuit of blower motor fan switch and resistor (if blower motor does not operate)
4	Start engine and run it at idle speed. Turn A/C switch ON. Do cooling fan and condenser fan operate?	Yes	Go to next step.
4		No	Cooling fan motor does not operate: Inspect for following: Cooling fan motor malfunction Cooling fan motor GND open Open circuit between cooling fan motor and fan control module Condenser fan motor does not operate: Inspect for following: Condenser fan motor malfunction Condenser fan motor GND open Open circuit between condenser fan motor and fan control module Both cooling fan and condenser fan do not operate: Inspect for following: Fan control module malfunction Fan control module GND open Open circuit between fan control module and cooling fan relay
5	Is drive belt okay?	Yes	Go to next step.
5	Is drive belt okay?	No	Replace drive belt.
6	Is there any leakage around heater unit in passenger compartment?	Yes	Inspect and service heater for leakage.
6		No	Go to next step.
7	Is there any leakage at coolant hoses and/or radiator?	Yes	Replace malfunctioning part.
7	Is there any leakage at coolant hoses and/or radiator?	No	Go to next step.
8	Cool down engine. Remove thermostat and inspect operation. (See THERMOSTAT REMOVAL/INSTALLATION .) (See THERMOSTAT INSPECTION ) Is thermostat okay?	Yes	Engine coolant temperature and thermostat are okay. Inspect engine block for leakage or blockage.
8		No	Access ECT PID on WDS or equivalent. Inspect both ECT PID and temperature gauge readings. If temperature gauge on instrument cluster indicates normal range but ECT PID is not same as temperature gauge reading, inspect ECT sensor. If temperature gauge on instrument cluster indicates overheating but ECT PID is normal, inspect temperature gauge and heat gauge unit.
9	Verify test results. If okay, return to diagnostic index to service any additional symptoms. If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace or reprogram PCM.