Diagnostic procedure

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DIAGNOSTIC PROCEDURE CHART

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED Have the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (engine cooling system related) been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY RELATED PENDING OR STORED DTC Switch the ignition to off, then to the ON (engine off). Verify the pending code or stored DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .) Are any other DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE .)
3		No	Go to the next step.
4	INSPECT THERMOSTAT Inspect the thermostat. (See THERMOSTAT INSPECTION .) Is there any malfunction?	Yes	Replace the thermostat, then go to Step 6. (See THERMOSTAT REMOVAL/INSTALLATION .)
4		No	Go to the next step.
5	INSPECT ECT SENSOR Inspect the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION .) Is there any malfunction?	Yes	Replace the ECT sensor, then go to the next step. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)
5		No	Go to the next step.
6	VERIFY MONITORING CONDITION FOR REPAIR VERIFICATION Make sure to reconnect all disconnected connectors. Cool down the engine. NOTE: If workshop inside and outside temperature difference is significant, PCM might not operate thermostat monitor. Therefore, it is recommended to coot down engine out of workshop. Switch the ignition to ON (engine off). Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE .) Access the ECT and IAT PIDs using the M-MDS under the following conditions: (See ON-BOARD DIAGNOSTIC TEST .) P0126:00 IAT: above -10 °C {14 °F} P0128:00 IAT: above -10 °C {14 °F} ECT: below 36 °C {97 °F} Difference between ECT and IAT: below 6 °C{10.8°F} Is there any PID that out of the specification?	Yes	Take corrective action (e.g. cool down engine). Repeat this step.
6		No	P0126:00 Go to the next step. P0128:00 Go to Step 8.
7	VERIFY TROUBLESHOOTING OF DTC P0126:00 COMPLETED Start engine and turn off the electrical load and A/C. Access and monitor the PIDs TH_M (Temp unit) and TH_M MIN (Temp unit) using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .) NOTE: This test requires actual driving. Chassis roller cannot be used for this test. During the test drive, constant speed should be maintained, although 2 or 3 stops during every 5 min of driving time (e.g. for traffic signals) is acceptable. Stop-and-go (e.g. in case of traffic congestion) is not acceptable during the test period. Test period depends on ECT at engine start, (e.g. if ECT is -10 °C {14 °F} , monitoring period is 38 min and ECT is 30 °C {86 °F} , monitoring period is 8 min ) Verify the PIDs TH_M and TH_M_MIN values. Is the TH_M value above TH_M_MIN value?	Yes	Go to Step 9.
7		No	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION .) Go to the next step.
8	VERIFY TROUBLESHOOTING OF DTC P0128:00 COMPLETED Start engine and turn off the electrical load and A/C. Access and monitor the PIDs TH_M (Temp and Num units), TH_M_MAX (Num unit) and TH_M MIN (Temp unit) using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .) NOTE: This test requires actual driving. Chassis roller cannot be used for this test. During the test drive, constant speed should be maintained, although 2 or 3 stops (e.g. for traffic signals) is acceptable. Stop-and-go (e.g. in case of traffic congestion) is not acceptable during the test period. Verify the PIDs TH_M, TH_M MAX and TH_M_MIN values. Are TH_M value of Num unit below TH_M_MAX value and TH_M value of Temp unit above TH_M_MIN value?	Yes	Go to the next step.
8		No	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION .) Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE .)
9		No	DTC troubleshooting completed.