Acura RL. Manual - part 697

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals
at the A/F sensor (Sensor 1) and the PCM

5. Turn the ignition switch OFF.

6. Jump the SCS line with the HDS.

7. Disconnect the A/F sensor (Sensor 1) 8P connector.

8. Disconnect PCM connector B (24P).

9. Connect A/F sensor (Sensor 1) 8P connector terminal No. 6 to body ground with a jumper wire.

Fig. 105: Connecting A/F Sensor (Sensor 1) 8P Connector Terminal No. 6 To Body Ground
With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.

10. Check for continuity between PCM connector terminal B12 (B20)* and body ground.

Fig. 106: Checking Continuity Between PCM Connector Terminal B12 (B20) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 11.

NO - Repair open in the wire between the PCM (B12 (B20)*) and the A/F sensor (Sensor 1), then go
to step 15.

11. Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector, then reconnect PCM connector

B (24P).

12. Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:59 PM

radiator fan comes on, then let it idle 2 minutes.

13. Measure voltage between PCM connector terminals B12 (B20)* and C12.

Fig. 107: Measuring Voltage Between PCM Connector Terminals B12 (B20) And C12
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 0.2 V or less?

YES - Go to step 21.

NO - Go to step 14.

14. Replace the A/F sensor (see A/F SENSOR REPLACEMENT ).

15. Reconnect all connectors.

16. Turn the ignition switch ON (II).

17. Reset the PCM with the HDS.

18. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).

19. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2251 and/or P2254* indicated?

YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then
go to step 1.

NO - Go to step 20.

20. Monitor the OBD STATUS for DTC P2251 and/or P2254* in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 19,
go to the indicated DTCs troubleshooting

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor
(Sensor 1) and the PCM, then go to step 1. If the screen indicates NOT COMPLETED, keep idling

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:59 PM

until a result comes on.

21. Turn the ignition switch OFF.

22. Reconnect all connectors.

23. Update the PCM if it does not have the latest software (see UPDATING THE PCM ), or substitute a

known-good PCM (see SUBSTITUTING THE PCM ).

24. Check for Temporary DTCs or DTCs with the HDS.

If DTC P2251 and/or P2254* indicated?

YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the
PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck.
If the PCM was substituted, go to step 1.

NO - Go to step 25.

25. Monitor the OBD STATUS for DTC P2251 and/or P2254* in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the
original PCM (see PCM REPLACEMENT ). If any other Temporary DTCs or DTCs were indicated
in step 24, go to the indicated DTCs troubleshooting

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor
(Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see
SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go to step 1. If the screen
indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2252: REAR A/F SENSOR (BANK 1, SENSOR 1) VS CIRCUIT LOW VOLTAGE; DTC
P2255: FRONT A/F SENSOR (BANK 2, SENSOR 1) VS CIRCUIT LOW VOLTAGE

1. Turn the ignition switch ON (II).

2. Clear the DTC with the HDS.

3. Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the

radiator fan comes on, then let it idle 2 minutes.

4. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2252 and/or P2255* indicated?

YES - Go to step 5.

NOTE:



Before you troubleshoot, record all freeze data and any on-board
snapshot, and review the general troubleshooting information (see
GENERAL TROUBLESHOOTING INFORMATION ).



Information marked with an asterisk (*) applies to the front bank (Bank
2).

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:59 PM

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals
at the A/F sensor (Sensor 1) and the PCM

5. Turn the ignition switch OFF.

6. Jump the SCS line with the HDS.

7. Disconnect the A/F sensor (Sensor 1) 8P connector.

8. Disconnect PCM connector B (24P).

9. Check for continuity between PCM connector terminal B12 (B20)* and body ground.

Fig. 108: Checking Continuity Between PCM Connector Terminal B12 (B20) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between the PCM (B12 (B20)* and the A/F sensor (Sensor 1), then go
to step 14.

NO - Go to step 10.

10. Reconnect PCM connector B (24P).

11. Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the

radiator fan comes on, then let it idle 2 minutes.

12. Measure voltage between PCM connector terminals B12 (B20)* and C12.

Fig. 109: Measuring Voltage Between PCM Connector Terminals B12 (B20) And C12

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:59 PM

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