Diagnostic Trouble Codes Troubleshooting

WARNING: In order to reduce risk of fire and personal injury, this work must be performed in a well ventilated area and away from any open flames such as gas hot water.

DTC TROUBLESHOOTING

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	Check fuel tank pressure and temp, sensor power supply voltage Remove fuel tank referring to FUEL TANK REMOVAL AND INSTALLATION . Disconnect connector from fuel tank pressure and temp, sensor with ignition switch turned OFF. Check for proper connection to fuel tank pressure and temp, sensor at "GRY/RED" and "ORN" wire terminals. If OK, then turn ON ignition switch, measure voltage between "GRY/RED" wire terminal of fuel tank pressure and temp, sensor connector and vehicle body ground. Is voltage about 4 - 6 V?	Go To Step 6.	Go To Step 3.
3	Check ECM voltage Disconnect connectors from ECM with ignition switch turned OFF. Remove ECM from vehicle body referring to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION and connect connectors to ECM. Check for proper connection of ECM connector at "C46-23" terminal. If OK, then turn ON ignition switch, measure voltage between "C46-23" terminal of ECM connector and vehicle body ground. Is voltage about 4 - 6 V?	Open wire in "GRY/ RED" circuit. If wire and connection are OK, Go To Step 5.	Go To Step 4.
4	Check ECM voltage Disconnect connectors from TP sensor and MAP sensor. Turn ON ignition switch, measure voltage between "C46-23" terminal of ECM connector and vehicle body ground. Is voltage about 4 - 6 V?	Faulty MAP sensor and/ or TP sensor. Check MAP sensor and/ or TP sensor.	Go To Step 5.
5	Check fuel tank pressure and temp, sensor power supply circuit Measure resistance between "GRY/RED" wire terminal of fuel tank pressure and temp, sensor connector and vehicle body ground with ignition switch turned OFF. Is resistance infinity?	Go To Step 6.	"GRY/RED" wire shorted to ground circuit. If wire is OK, substitute a known-good ECM and recheck.
6	Check ground circuit Connect connectors to ECM. Check for proper connection of fuel tank pressure and temp, sensor at "ORN" wire terminal. If OK, measure resistance between "ORN" wire terminal of fuel tank pressure and temp, sensor connector and body ground. Is resistance below 10 Ω?	Go To Step 8.	Go To Step 7.
7	Check ground circuit Measure resistance between "G04-15" terminal of ECM connector and body ground. Is resistance below 5 Ω?	Open or high resistance wire in "ORN" circuit. Poor "G04-15" terminal of ECM connector connection.	Faulty ECM ground circuit. If circuit are OK, substitute a known-good ECM and recheck.
8	Check fuel tank pressure and temp, sensor signal Disconnect connectors from ECM with ignition switch turned OFF. Check for proper connection of ECM connector at "G04-19" terminal. If OK, measure resistance between "RED/YEL" wire terminal of fuel tank pressure and temp, sensor connector and vehicle body ground. Is resistance infinity?	Go To Step 9.	"RED/YEL" wire shorted to ground circuit.
9	Check wire circuit Measure resistance between "G04-19" terminal of ECM connector and "RED/YEL" wire terminal of fuel tank pressure and temp, sensor connector with ignition switch turned OFF. Is resistance below 5 Ω?	Go To Step 10.	Open or high resistance wire in "RED/YEL" circuit.
10	Check fuel tank pressure and temp, sensor Check fuel tank pressure and temp, sensor according to "FUEL TANK PRESSURE AND TEMP. SENSOR INSPECTION .". Is it in good condition?	Substitute a known-good ECM and recheck.	Replace fuel tank pressure and temp, sensor.