DTC Troubleshooting

DTC DIAGNOSTIC TROUBLESHOOTING CHART

Step	Action	YES	NO
1	Was "Engine and Emission Control System Check" performed?	Go to Step 2	Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK
2	EVAP leak detecting pump check Check that "GRY", "BRN/RED", "BRN/WHT", "BLU/BLK", "PPL/RED", "GRY/BLU" and "BLK/GRN" wire circuits are in good condition. Check EVAP leak detecting pump for operation referring to "EVAP LEAK DETECTING PUMP CHECK " under EVAP LEAK CHECK MODULE INSPECTION Is check result satisfactory?	Go to Step 3.	Faulty EVAP leak detecting pump, replace EVAP leak check module.
3	EVAP leak check pressure sensor check Check initial (barometric) pressure voltage and reference pressure voltage referring to "EVAP LEAK CHECK PRESSURE SENSOR (COMBINE WITH BARO SENSOR) CHECK " under EVAP LEAK CHECK MODULE INSPECTION . Is check result satisfactory?	Go to Step 4.	Faulty reference orifice or EVAP leak check pressure sensor, replace EVAP leak check module.
4	EVAP leak check module visual check Perform visual check of EVAP leak check module referring to "EVAP Leak Check Module Visual Check" under EVAP LEAK CHECK MODULE INSPECTION . Is check result satisfactory?	Substitute a known-good ECM and recheck.	Replace EVAP leak check module.