Acura RL. Manual - part 671

Is DTC P0134 and/or P0154* indicated?

YES - Go to step 5.

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

5. Turn the ignition switch OFF.

6. Replace the A/F sensor (Sensor 1) (see A/F SENSOR REPLACEMENT ).

7. Turn the ignition switch ON (II).

8. Reset the PCM with the HDS.

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

10. 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.

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

Is DTC P0134 and/or P0154* indicated?

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

NO - Go to step 12.

12. Monitor the OBD STATUS for DTC P0134 and/or P0154* 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 11,
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), the A/F sensor relay (LAF), the under-dash fuse/relay box, and the PCM, then go to step 1.
If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P0135: REAR A/F SENSOR (BANK 1, SENSOR 1) HEATER CIRCUIT MALFUNCTION;
DTC P0155: FRONT A/F SENSOR (BANK 2, SENSOR 1) HEATER CIRCUIT MALFUNCTION

1. Turn the ignition switch ON (II).

2. Clear the DTC with the HDS.

3. Start the engine.

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

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 2:34:58 PM

Page 26

Is DTC P0135 and/or P0155* indicated?

YES - Go to step 5.

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

5. Turn the ignition switch OFF.

6. Check these fuses:



No. 19 OPTION (40A) fuse in the under-hood fuse/relay box.



No. 4 A/F SENSOR (15A) fuse in the under-dash fuse/relay box.



No. 23 IGP (7.5A) fuse in the under-dash fuse/relay box.

Are any of the fuses blown?

YES - Repair short in the wire between the A/F sensors, the A/F sensor relay (LAF), and the fuses,
then go to step 24.

NO - Go to step 7.

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

8. Measure resistance between A/F sensor (Sensor 1) 8P connector terminals No. 1 and No. 2.

Fig. 23: Measuring Resistance Between A/F Sensor (Sensor 1) 8P Connector Terminals No. 1
And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there 2.5-3.2 ohms at room temperature?

YES - Go to step 9.

NO - Go to step 22.

9. Check for continuity between each terminal at the A/F sensor (Sensor 1) 8P connector and body

ground.

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:58 PM

Page 27

Fig. 24: Checking Continuity Between Terminal A/F Sensor (Sensor 1) 8P Connector And Body
Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 22.

NO - Go to step 10.

10. Check for continuity between A/F sensor (Sensor 1) 8P connector terminals No. 1 and No. 3, No. 4,

No. 6, No. 7, and No. 8 individually.

Fig. 25: Checking Continuity Between A/F Sensor (Sensor 1) 8P Connector Terminals 1 And 3,
4, 6, 7, And 8
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 22.

NO - Go to step 11.

11. Jump the SCS line with the HDS.

12. Disconnect PCM connector A (31P).

13. Check for continuity between PCM connector terminal A7 (A6)* and body ground.

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:58 PM

Page 28

Fig. 26: Checking Continuity Between PCM Connector Terminal A7 (A6) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between the PCM (A7 (A6)*) and the A/F sensor (Sensor 1), then go
to step 23.

NO - Go to step 14.

14. Connect A/F sensor (Sensor 1) 8P connector terminal No. 2 to body ground with a jumper wire.

Fig. 27: Connecting A/F Sensor (Sensor 1) 8P Connector Terminal No. 2 To Body Ground With
Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.

15. Check for continuity between PCM connector terminal A7 (A6)* and body ground.

Fig. 28: Checking Continuity Between PCM Connector Terminal A7 (A6) And Body Ground

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:58 PM

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