DTC Troubleshooting

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

DTC 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	Visual inspection Check MAF sensor and air intake system for: Objects which block measuring duct and resistor of MAF sensor. Other air flow which does not pass the MAF sensor. Are they in good condition?	Go to Step 3.	Repair or replace.
3	MAF sensor performance check With ignition switch OFF, connect scan tool to DLC. Start engine and warm up to normal operation temperature. Check MAF value using scan tool. (Refer to SCAN TOOL DATA for normal value). Is normal valve indicated?	Intermittent trouble. Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION .	Go to Step 4.
4	Wire harness check Check power supply, signal and ground circuits of MAF sensor for condition referring to Step 3 and 4 of DTC P0102/P0103: MASS AIR FLOW CIRCUIT LOW/HIGH INPUT . Are they in good condition?	Go to Step 5.	Repair or replace.
5	MAF sensor signal check Turn ignition switch OFF position. Connect connectors to MAF sensor and ECM. Check MAF sensor signal voltage referring to MASS AIR FLOW (MAF) AND INTAKE AIR TEMPERATURE (IAT) SENSOR ON-VEHICLE INSPECTION . Is each value within specified range?	Go to Step 6.	Replace MAF and IAT sensor.
6	MAP sensor check Check MAP sensor for performance referring to MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR REMOVAL AND INSTALLATION . Is it in good condition?	Substitute a known-good ECM and recheck. If ECM is OK, replace exhaust manifold (built-in WU-TWC converter)	Replace MAP sensor.