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ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (FS)] 01–02B–84 Diagnostic procedure End Of Sie DTC P0421 [FS] A3U010201086W03 POSSIBLE CAUSE • EGR valve gasket is not installed. • EGR valve gasket has been damaged. • PCM malfunction STEP INSPECTION ACTION 1 VERIFY FREEZE FRAME DATA HAS BEEN • Has FREEZE FRAME DATA been recorded? Yes Go to next step. No Record FREEZE FRAME DATA on repair order, then go to 2 VERIFY RELATED REPAIR INFORMATION • Check for related Service Bulletins availability. • Is any related repair information available? Yes Perform repair or diagnosis according to available repair information. • If vehicle is not repaired, go to next step. No Go to next step. 3 INSPECT FOR OTHER DTCS • Turn ignition key to OFF then start engine. • Have other DTCs been stored? Yes Go to applicable DTC troubleshooting. No Go to next step. 4 INSPECT EGR VALVE GASKET • Turn ignition key to OFF. • Remove EGR valve. • Is EGR valve gasket installed? Yes Go to next step. No Install EGR valve gasket, then go to Step 6. 5 INSPECT EGR VALVE GASKET MALFUNCTION • Does EGR valve gasket have any crack and/or Yes Replace EGR valve gasket, then go to Step 6. No Go to next step. 6 MONITOR EGR SYSTEM BY DRIVE MODE • Make sure to reconnect all disconnected • Run OBD-II Drive Mode 1 and 2. • Check EGR System Monitor completion status • Has EGR system been monitored? Yes Go to next step. No Retry this step. 7 VERIFY TROUBLESHOOTING OF DTC P0402 • Access DIAGNOSTIC MONITORING TEST • Verify TEST ID 10:41:00 value. • Is value within specification? Yes Go to next step. No Replace PCM, then go to next step. 8 VERIFY AFTER REPAIR PROCEDURE • Perform “After Repair Procedure”. • Is there any DTC present? Yes Go to applicable DTC inspection. (See 01–02B–15 DTC TABLE [FS].) No Troubleshooting completed. DTC P0402 EGR flow excessive detected DTC P0421 Warm-up catalyst system efficiency below threshold DETECTION CONDITION • PCM compares the number of HO2S (front) and HO2S (rear) inversions for a predetermined time. PCM MONITORING CONDITIONS — Engine speed is 1,500—3,000 rpm. 1 ). — Vehicle speed is 28—120 km/h {17.3—74.5 mph}. * 1 : Maximum calculated load value varies depending on engine speed. Diagnostic support note • This is an intermittent monitor. (CATALYST) • MIL illuminates if PCM detects the above malfunction conditions in two consecutive drive cycles. • DIAGNOSTIC MONITORING TEST RESULTS is available. • PENDING CODE is stored if PCM detects the above malfunction condition during first drive cycle. • FREEZE FRAME DATA is available. • DTC is stored in PCM memory. 1712-1U-01G(01-02B).fm 84 ページ 2001年6月29日 金曜日 午後3時24分 |