Diagnostic procedure

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	Inspect the 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 normal?	Yes	Go to the next step.
1		No	Service as necessary. Repeat Step 1.
2	Connect M-MDS to DLC-2. Turn ignition switch to ON position (Engine OFF). Retrieve any DTCs. Are there any DTCs displayed?	Yes	DTC is displayed: Go to appropriate DTC test.
2		No	No DTC is displayed: Go to the next step.
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 the following and repair or replace as necessary: Refrigerant charging amount Open circuit between A/C relay and PCM terminal 1AW Seized A/C magnetic clutch A/C magnetic clutch malfunction If all items are normal, Inspect the 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 1AN 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 and set blower fan any speed. Do cooling fan and condenser fan operate?	Yes	Go to the next step.
4		No	Cooling fan motor does not operate: Inspect for following: Cooling fan motor malfunction Cooling fan motor GND open circuit Open circuit between cooling fan motor and fan control module Condenser fan motor does not operate: Inspect for the following: Condenser fan motor malfunction Condenser fan motor GND open circuit Open circuit between condenser fan motor and fan control module Both cooling fan and condenser fan do not operate: Inspect for the following: Fan control module malfunction Fan control module GND open circuit Open circuit between fan control module and cooling fan relay
5	Is drive belt normal?	Yes	Go to the next step.
5	Is drive belt normal?	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 the 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 the next step.
8	Cool down engine. Remove thermostat and inspect operation. (See THERMOSTAT REMOVAL/INSTALLATION ). (See THERMOSTAT INSPECTION ). Is thermostat normal?	Yes	Engine coolant temperature and thermostat are normal. Inspect engine block for leakage or blockage.
8		No	Access ECT PID on M-MDS. 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 normal, 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, reprogram PCM if later calibration is available. Retest.