DTC Troubleshooting

NOTE: Before this trouble shooting is performed, read the precautions for DTC troubleshooting by referring to PRECAUTIONS FOR DTC TROUBLESHOOTING .

TROUBLESHOOTING TABLE

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 EVAP leak detection pump for operation by referring to EVAP Leak Detecting Pump Check under EVAP LEAK CHECK MODULE INSPECTION . Is it in good condition?	Go to Step 3.	Replace EVAP leak check module.
3	Wire harness check Check control and ground circuits of EVAP leak detection pump for condition by referring to Step 2 of DTC P1422: EVAPORATIVE EMISSION SYSTEM LEAK DETECT PUMP STUCK OFF . Are they in good condition?	Go to Step 4.	Control and ground circuits of EVAP leak detecting pump are open, short and/or high resistance.
4	EVAP leak check pressure sensor check Check EVAP leak check pressure sensor for performance by referring to EVAP Leak Check Pressure Sensor Check under EVAP LEAK CHECK MODULE INSPECTION . Is it in good condition?	Go to Step 5.	Replace EVAP leak check module.
5	EVAP leak check pressure sensor check Perform visual check of EVAP leak check module by referring to EVAP Leak Check Module Visual Check under EVAP Leak Check Module Inspection. Is it in good condition?	Substitute a known good ECM and recheck.	Replace EVAP leak check module.