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ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (ZM)] 01–02A–130 Diagnostic procedure DTC P1499 EGR valve stepping motor coil 4 open or short circuit STEP INSPECTION ACTION 1 VERIFY RELATED REPAIR INFORMATION • Check for related Service Bulletins availability. • Is any 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. 2 CLASSIFY INTERMITTENT CONCERN OR • Turn ignition key to OFF then ON (Engine • Is same DTC present? Yes Go to next step. No Refer to intermittent concern. 3 CLASSIFY POWER CIRCUIT OR CONTROL • Are same DTC and P1498 present? Yes Malfunction at EGR valve or power circuit. Go to next step. No Malfunction at EGR valve or control circuit. 4 INSPECT EGR VALVE FOR POOR • Turn ignition key to OFF. • Disconnect EGR valve connector. • Check for poor connection (damaged/pulled- • Is there malfunction? Yes Repair or replace terminals, then go to Step 11. No Go to next step. 5 INSPECT POWER CIRCUIT FOR OPEN • Turn ignition key to ON (Engine OFF). • Measure voltage between EGR valve terminal • Is voltage B+? Yes Inspect EGR valve coils 3 and 4. (See 01–16–15 EGR VALVE INSPECTION.) • If there is a malfunction, replace EGR valve, and then • If there is no malfunction, go to Step 11. No Repair or replace harness for open circuit, then go to Step 6 INSPECT EGR VALVE FOR POOR • Turn ignition key to OFF. • Disconnect EGR valve connector. • Check for poor connection (damaged/pulled- • Is there malfunction? Yes Repair or replace terminals, then go to Step 11. No Go to next step. 1712-1U-01G(01-02A).fm 130 ページ 2001年6月29日 金曜日 午後2時20分 |