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ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (FS)] 01–02B–24 Diagnostic procedure POSSIBLE CAUSE • HO2S (rear) malfunction • Short to power circuit between HO2S (rear) terminal D (harness-side) and PCM terminal 93 (harness-side) • Shorted HO2S (rear) or PCM terminal • PCM malfunction DTC P0038 HO2S heater (rear) circuit high 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 HO2S (REAR) TERMINAL • Turn ignition key to OFF. • Disconnect HO2S (rear) connector. • Check for bent terminals. • Is there malfunction? Yes Repair or replace terminal, then go to Step 7. No Go to next step. 4 INSPECT HO2S HEATER (REAR) • Measure resistance between HO2S (rear) • Is resistance approx. 15.7 ohms Yes Go to next step. No Replace the HO2S (rear), then go to Step 7. 5 INSPECT PCM TERMINAL • Disconnect PCM connector. • Check for bent terminal at terminal 93. • Is there malfunction? Yes Repair terminal, then go to Step 7. No Go to next step. 6 INSPECT HO2S (REAR) HEATER CONTROL • Turn ignition key to ON (Engine OFF). • Measure voltage between HO2S (rear) • Is voltage B+? Yes Repair or replace harness for short to power circuit, then go to next step. No Go to next step. 1712-1U-01G(01-02B).fm 24 ページ 2001年6月29日 金曜日 午後3時24分 |