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ON-BOARD DIAGNOSTIC [L3 WITH TC] 01-02–91 01-02 3 VERIFY RELATED PENDING AND STORED • Turn the ignition switch off, then to the ON position (Engine off). • Verify pending and/or stored DTCs using the M-MDS. • Is DTC P0443 also present? Yes Go to DTC P0443 troubleshooting procedures, then go to No Go to the next step. 4 IDENTIFY TRIGGER DTC FOR FREEZE FRAME • Is DTC P0139 on the FREEZE FRAME DATA? Yes Go to the next step. No Go to troubleshooting procedures for the DTC on the 5 VERIFY CURRENT INPUT SIGNAL STATUS • Warm up the engine. • Access the O2S12 PID using the M-MDS. • Inspect the PID under the following accelerator pedal conditions or NEUTRAL. • Is the PID normal? — More than 0.55 V the accelerator pedal is suddenly depressed (rich condition). — Less than 0.55 V just after accelerator pedal is released (lean condition). Yes Go to Step 8. No Go to the next step. 6 INSPECT INSTALLATION OF REAR HO2S • Inspect if the rear HO2S is loosely installed. • Is the sensor installed securely? Yes Go to the next step. No Retighten the sensor, then go to Step 13. 7 INSPECT GAS LEAKAGE FROM EXHAUST • Visually inspect if there is any gas leakage between the exhaust manifold and the rear • Is there gas leakage? Yes Repair or replace the malfunctioning faulty exhaust part, No Replace sensor, then go to Step 13. 8 INSPECT LONG TERM FUEL TRIM • Access the LONGFT1 PIDs • Compare it with the FREEZE FRAME DATA recorded at Step 1. • Is it below the FFD value? Yes The engine is driven under a rich condition. Go to the next No The engine is driven under a lean condition. Go to Step 10. 9 INSPECT FUEL LINE PRESSURE (Excessive • Turn the ignition switch off. • Inspect the fuel line pressure while the engine is running. • Is the fuel line pressure normal? Yes Go to Step 12. No Inspect fuel pump maximum pressure and fuel return pipe • If there is any problem, repair or replace the parts. • If all items above are normal, replace the fuel pump unit. Then go to Step 13. 10 INSPECT FUEL LINE PRESSURE (Low fuel line • Turn the ignition switch off. • Inspect the fuel line pressure while the engine is running. • Is the fuel line pressure normal? Yes Go to Step 12. No Go to the next step. 11 INSPECT FUEL LINE FROM FUEL PUMP TO • Visually inspect the fuel line for any leakage. • Is there fuel leakage? Yes Replace the fuel line, then go to Step 13. No Inspect the fuel filters for the following: • Foreign material or staining inside the fuel filter (low- pressure side) Perform the following actions according to the result. • If foreign material or staining is found inside fuel filter (low-pressure side), clean the fuel tank and filter. • If normal, replace fuel pump unit. Then go to Step 13. STEP INSPECTION ACTION 1871-1U-06B(01-02).fm 91 ページ 2006年3月15日 水曜日 午前10時32分 |