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DTC P0137, P0157 HO2S2 EC-837 < SERVICE INFORMATION > [VK45DE] C D E F G H I J K L M A EC N P O 3. Disconnect mass air flow sensor (1) harness connector, and 4. Stop engine and reconnect mass air flow sensor harness con- 5. Make sure DTC P0102 is displayed. 6. Erase the DTC memory. Refer to 7. Make sure DTC P0000 is displayed. 8. Run engine for at least 10 minutes at idle speed. Yes or No Yes >> Perform trouble diagnosis for DTC P0171, P0174. Refer to . No >> GO TO 3. 3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 2 harness connector. 3. Disconnect ECM harness connector. 4. Check harness continuity between HO2S2 terminal 4 and ECM terminal 78. 5. Also check harness for short to ground and short to power. OK or NG OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors. 4. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Check harness continuity between ECM terminal and HO2S2 terminal as follows. 2. Check harness continuity between the following terminals and ground. PBIB3230E Continuity should exist. PBIB1534E DTC Terminals Bank ECM Sensor P0137 55 1 1 P0157 74 1 2 Continuity should exist. DTC Terminals Bank ECM Sensor P0137 55 1 1 P0157 74 1 2 |