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	Is there DTC(s) other than fuel system (DTC P0171 / P0172 / 2195 / 2196)?	Go to applicable DTC diag. flow.	Go to Step 3.
3	Intake system and exhaust system for leakage check Check intake system and exhaust system for leakage. Are intake system and exhaust system in good condition?	Go to Step 4.	Repair or replace defective parts.
4	Fuel pressure check Check fuel pressure referring to FUEL PRESSURE CHECK . Is check result satisfactory?	Go to Step 5.	Repair or replace defective parts.
5	Fuel injectors and its circuit check Check fuel injectors referring to FUEL INJECTOR INSPECTION . Is check result satisfactory?	Go to Step 6.	Faulty injection(s) or its circuit.
6	MAF sensor visual inspection Check MAF sensor and air intake system. Objects which block measuring duct and resistor of MAF sensor. Other air flow which does not pass MAF sensor. Are they in good condition?	Go to Step 7.	Repair or replace defective part.
7	MAF sensor for performance check With ignition switch turned OFF, connect scan tool to DLC. Start engine and warm up to normal operating temperature. Check MAF value using scan tool (Refer to SCAN TOOL DATA for normal value). Is each value within specified range?	Go to Step 8.	Go to DTC P0101: MASS OR VOLUME AIR FLOW CIRCUIT RANGE / PERFORMANCE .
8	ECT sensor for performance check Check ECT sensor performance referring to Step 2 to 3 and 5 of DTC P0116: ENGINE COOLANT TEMPERATURE CIRCUIT RANGE / PERFORMANCE . Is check result satisfactory?	Go to Step 9.	Faulty ECT sensor or its circuit.
9	A/F sensor for performance check Check A/F sensor referring to Step 3 and 4 of DTC P0131 / P0132: O2 SENSOR CIRCUIT LOW VOLTAGE / HIGH VOLTAGE (SENSOR-1, BANK-1) . Is check result satisfactory?	Replace A/F sensor and recheck. If this DTC is detected again, substitute a known-good ECM.	Repair or replace defective circuit.