DTC P1168: A/F Sensor (Sensor 1) LABEL Circuit Low Input (2000-2001 M/T models)

NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Reset the ECM with the HDS (see ECM RESET ).
Start the engine, and let it idle.
Wait at least 2 minutes.
Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1168 indicated?
1. YES - Go to step 5.
2. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM.
Turn the ignition switch OFF.
Disconnect ECM connector D (16P).
Check for continuity between ECM connector terminal D12 and body ground.

Fig 1: Checking Continuity Between ECM Connector Terminal D12 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Go to step 8.
2. NO - Substitute a known-good ECM (see HOW TO SUBSTITUTE THE ECM FOR TESTING PURPOSES (2000-2001 M/T MODELS) ), and recheck. If the symptom/indication goes away, replace the original ECM (see ECM REPLACEMENT ).
Disconnect the A/F sensor (Sensor 1) 8P connector.
Check for continuity between ECM connector terminal D12 and body ground.

Fig 2: Checking Continuity Between ECM Connector Terminal D12 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Repair short in the wire between the ECM (D12) and the A/F sensor (Sensor 1).
2. NO - Replace the A/F sensor (Sensor 1) (see A/F SENSOR REPLACEMENT .