DTC Troubleshooting

DIAGNOSIS PROCEDURE

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 and its circuit check Check operating sound of EVAP leak detecting pump referring to "EVAP Leak Detecting Pump Circuit Check" under EVAP LEAK CHECK MODULE AND ITS CIRCUIT INSPECTION (VEHICLE WITH ORVR SYSTEM) . Is operating sound heard?	Go to Step 5.	Go to Step 3.
3	EVAP leak detecting pump ground circuit check Disconnect EVAP leak check module coupler with ignition switch turned OFF. Check for proper connection to EVAP leak check module coupler at "LT GRN" and "BLK" wire terminals. Measure resistance between "BLK" wire terminal of EVAP leak check module coupler and vehicle body ground. Is resistance below 5 ohm?	Go to Step 4.	"BLK" wire is open or high resistance circuit.
4	EVAP leak detecting pump power supply circuit check When EVAP leak detecting pump is operated by "MISC TEST" of scan tool, measure voltage between "GRY/BLU" wire terminal of EVAP leak check module coupler and vehicle body ground. Is voltage 10 - 14 V?	Go to Step 5.	"LT GRN" wire circuit is open, shorted to ground or poor connection at "C51-3-7" terminal.
5	EVAP leak detection pump check Check EVAP leak detecting pump for operation referring to "EVAP Leak Detecting Pump Check" under EVAP LEAK CHECK MODULE INSPECTION (VEHICLE WITH ORVR SYSTEM) . Is check result satisfactory?	Substitute a known-good ECM and recheck.	Replace EVAP leak check module.