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Acura RL. Manual - part 681

Is there continuity?

YES - Go to step 13.

NO -Repair open in the wire between the PCM (B6) and the knock sensor, then go to step 17.

13. Remove the intake manifold (see REMOVAL ).

14. Check the knock sensor subharness 1P connector and the knock sensor for an open or short.

Is the harness OK?

YES - Go to step 15.

NO - Repair the knock sensor subharness, then go to step 17.

15. Replace the knock sensor (see KNOCK SENSOR REPLACEMENT ).

16. Install the intake manifold (see INSTALLATION ).

17. Reconnect all connectors.

18. Turn the ignition switch ON (II).

19. Reset the PCM with the HDS.

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

21. Hold the engine speed at 3,000-4,000 RPM for at least 10 seconds.

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

Is DTC P0325 indicated?

YES - Check for poor connections or loose terminals at the knock sensor and the PCM, then go to
step 1.

NO - Go to step 23.

23. Monitor the OBD STATUS for DTC P0325 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 22,
go to the indicated DTCs troubleshooting

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the knock
sensor and the PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 21.

24. 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 ).

25. 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.

26. Hold the engine speed at 3,000-4,000 RPM for at least 10 seconds.

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

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

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

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Is DTC P0325 indicated?

YES - Check for poor connections or loose terminals at the ignition coil, the injector, and the PCM. If
the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go
to step 26. If the PCM was substituted, go to step 1.

NO - Go to step 28.

28. Monitor the OBD STATUS for DTC P0325 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 27, go to the indicated DTCs troubleshooting

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the ignition
coil, the injector, and the PCM. If the PCM was updated, substitute a known-good PCM (see
SUBSTITUTING THE PCM ), then go to step 26. If the PCM was substituted, go to step 1. If the
screen indicates NOT COMPLETED, go to step 26.

DTC P0335: CKP SENSOR A NO SIGNAL; DTC P0385: CKP SENSOR B NO SIGNAL

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.

Is DTC P0335 and/or P0385 indicated?

YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals
at CKP sensor A/B and the PCM

5. Turn the ignition switch OFF.

6. Disconnect CKP sensor A/B 6P connector (see CKP SENSOR REPLACEMENT ).

7. Turn the ignition switch ON (II).

8. Measure voltage between CKP sensor A/B 6P connector terminal No. 6 (No. 3)* and body ground.

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 CKP sensor B.

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

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

Page 67

Fig. 61: Measuring Voltage Between CKP Sensor A/B 6P Connector Terminal No. 6 (No. 3) And
Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 9.

NO - Repair open in the wire between CKP sensor A/B and PGM-FI main relay 1 (Fl MAIN), then go
to step 18.

9. Measure voltage between CKP sensor A/B 6P connector terminal No. 5 (No. 2)* and body ground.

Fig. 62: Measuring Voltage Between CKP Sensor A/B 6P Connector Terminal No. 5 (No. 2) And
Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES - Go to step 10.

NO - Go to step 11.

10. Measure voltage between CKP sensor A/B 6P connector terminals No. 4 (No. 1)* and No. 6 (No. 3)*.

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

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

Page 68

Fig. 63: Measuring Voltage Between CKP Sensor A/B 6P Connector Terminals No. 4 (No. 1)
And 6 (No. 3)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 16.

NO - Repair open in the wire between CKP sensor A/B and G101, then go to step 18.

11. Measure voltage between PCM connector terminal B17(B1)* and body ground.

Fig. 64: Measuring Voltage Between PCM Connector Terminal B17(B1) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES - Repair open in the wire between the PCM (B17 (B1)*) and CKP sensor A/B, then go to step
18.

NO - Go to step 12.

12. Turn the ignition switch OFF.

13. Jump the SCS line with the HDS.

14. Disconnect PCM connector B (24P).

15. Check for continuity between PCM connector terminal B17 (B1)* and body ground.

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

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

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