Diagnostic Procedure

DIAGNOSTIC PROCEDURE DESCRIPTION

STEP	INSPECTION	RESULTS	ACTION
1	Inspect the following: Collapsed or restricted radiator hoses Coolant leakage Engine coolant level Fan rotational direction Fuses Overflow system Radiator condition Radiator pressure cap Water and anti-freeze mixture Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results. Repeat Step 1.
1		No	Go to the next step.
2	Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST [MZR 1.5] ). Are any continuous memory DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 1.5] ).
2		No	Go to the next step.
3	Start the engine and idle it. Turn the A/C switch on. Does the A/C compressor engage?	Yes	Go to Step 5.
3		No	Inspect the following: A/C magnetic clutch malfunction Open circuit in wiring harness between A/C relay and PCM terminal 1AN Refrigerant charging amount Seized A/C magnetic clutch If there is any malfunction: Repair or replace the malfunctioning part according to the inspection results. If there is no malfunction: Go to the next step.
4	Access the AC_REQ PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.5] ). Start the engine and idle it. Turn the A/C switch on. Does the AC_REQ PID read ON?	Yes	Go to the next step.
4		No	Inspect the following: Refrigerant pressure switch operation Climate control unit malfunction A/C switch is stuck open Open circuit of blower motor fan switch and resistor (if blower motor does not operate) Open or short circuit between refrigerant pressure switch and PCM terminal 1AO Evaporator temperature sensor and related wiring harness Repair or replace the malfunctioning part according to the inspection results.
5	Perform the Cooling Fan Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION ). Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
5		No	Go to the next step.
6	Inspect the drive belt. (See DRIVE BELT INSPECTION ). Is there any malfunction?	Yes	Replace the drive belt. (See DRIVE BELT REMOVAL/INSTALLATION ).
6		No	Go to the next step.
7	Visually inspect the leakage around heater unit in passenger compartment. Is there any leakage?	Yes	Repair or replace the malfunctioning part according to the inspection results.
7		No	Go to the next step.
8	Visually inspect the leakage at coolant hoses and/or radiator. Is there any leakage?	Yes	Repair or replace the malfunctioning part according to the inspection results.
8		No	Go to the next step.
9	Access the ECT1 PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.5] ). Compare for both the ECT1 PID and the low engine coolant temperature indicator light on instrument cluster condition. Is the low engine coolant temperature indicator light condition according to the ECT1 PID value?	Yes	Go to the next step.
9		No	Inspect the ECT sensor No.1. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION ). If there is any malfunction: Replace the ECT sensor No.1. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION ). If there is no malfunction: Inspect the instrument cluster. (See INSTRUMENT CLUSTER INSPECTION ). Replace the instrument cluster, if necessary. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION ).
10	Cool down the engine. Remove the thermostat. (See THERMOSTAT REMOVAL/INSTALLATION ). Inspect the thermostat operation. (See THERMOSTAT INSPECTION ). Is there any malfunction?	Yes	Replace the thermostat. (See THERMOSTAT REMOVAL/INSTALLATION ).
10		No	The Thermostat is normal. Inspect the engine block for leakage or blockage. Repair or replace the malfunctioning part according to the inspection results.
11	Verify the test results. If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX ). If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform 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.