ACURA CSX 2006 Service Repair Manual



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DTC P2647:
YES
NO
YES
NO
YES
NO YES
NO
YES
NO
11-287
ROCKER ARM OIL PRESSURE SWITCH 2P CONNECTOR
VTPSW
GND
VTPSW
(BLU/BLK)
ROCKER ARM OIL PRESSURE SWITCH 2P CONNECTOR
Rocker Arm Oil Pressure Switch
Circuit High Voltage
NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
1. Check the engine oil level.
Go to step 2.
Adjust the engine oil to the proper level, then
go to step 17.
2. Turn the ignition switch to ON (II).
3. Clear the DTC with the HDS.
4. Do the VTEC TEST in the INSPECTION MENU with the HDS.
Intermittent failure, the system is OK at this
time. Check for poor connections or loose terminals
at the rocker arm oil pressure switch, the rocker
arm oil control solenoid, and the ECM/PCM.
Go to step 5.
5. Check the result of step 4.  VTEC Switch Failure
 VTEC Switch Open
 VTEC Switch SIG Line Open
 VTEC Switch GND Line Open
Go to step 6.
Check for poor connections or loose terminals
at the rocker arm oil pressure switch. If it is OK,
replace the rocker arm oil control valve (see page
11-296), then, go to step 15.
6. Turn the ignition switch to LOCK (0).
7. Disconnect the rocker arm oil pressure switch 2P connector. 8. At the rocker arm oil pressure switch side, check for
continuity between rocker arm oil pressure switch
2P connector terminals No. 1 and No. 2.
Go to step 9.
Replace the rocker arm oil pressure switch
(see page 11-296), then go to step 16.
9. Turn the ignition switch to ON (II).
10. Measure the voltage between rocker arm oil pressure switch 2P connector terminal No. 1 and
body ground.
Repair open in the wire between the rocker
arm oil pressure switch and G101; A/T model
(see page 22-16), M/T model (see page 22-18), then
go to step 15.
Go to step 11.
(cont’d)
Terminal side of male terminals
Wire side of female terminals
Is the engine oil level OK ?
Is the result OK ?
I s t he t est r esul t any of abov e? Is there continuity?
Is there battery voltage?
08/08/21 14:28:25 61SNR030_110_0287
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YES
NO YES
NO
YES
NO
11-288VTEC/VTC
DTC Troubleshooting (cont’d)
VTPSW
(BLU/BLK)
ROCKER ARM OIL PRESSURE SWITCH 2P CONNECTOR
ECM/PCM CONNECTOR C (44P)
VTPSW (BLU/BLK)
11. Turn the ignition switch to LOCK (0).
12. Jump the SCS line with the HDS.
13. Disconnect ECM/PCM connector C (44P).
14. Check for continuity between rocker arm oilpressure switch 2P connector terminal No. 1 and
ECM/PCM connector terminal C22.
Go to step 22.
Repair open in the wire between the ECM/
PCM (C22) and the rocker arm oil pressure switch,
then go to step 16.
15. Turn the ignition switch to LOCK (0).
16. Reconnect all connectors.
17. Turn the ignition switch to ON (II).
18. Reset the ECM/PCM with the HDS.
19. Do the ECM/PCM idle learn procedure (see page 11-310). 20. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at the rocker arm oil pressure switch, the
rocker arm oil control solenoid, and the ECM/PCM,
then go to step 1.
Go to step 21.
21. Monitor the OBD STATUS for DTC P2647 in the DTCs MENU with the HDS.
Troubleshooting is complete. If any other
Temporary DTCs or DTCs were indicated in step 20,
go to the indicated DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at the rocker arm oil
pressure switch, the rocker arm oil control solenoid,
and the ECM/PCM, then go to step 1. If the screen
indicates NOT COMPLETED, keep idling until a
result comes on.
22. Reconnect all connectors.
23. Update the ECM/PCM if it does not have the latest software (see page 11-227), or substitute a known-
good ECM/PCM (see page 11-7).
24. Start the engine, and let it idle.
Wire side of female terminals
Terminal side of female terminals
Is there continuity? Is DTC P2647 indicated?
Does t he scr een i nd i cat e PASSE D?
08/08/21 14:28:26 61SNR030_110_0288
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YES
NO
YES
NO
YES
NO
YES
NO
DTC P2648:
11-28911-289
ROCKER ARM OIL CONTROL SOLENOID 2P CONNECTOR
25. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at the rocker arm oil pressure switch and
the ECM/PCM. If the ECM/PCM was updated,
substitute a known-good ECM/PCM (see page 11-7),
then go to step 24. If the ECM/PCM was substituted,
go to step 1.
Go to step 26.
26. Monitor the OBD STATUS for DTC P2647 in the DTCs MENU with the HDS.
If the ECM/PCM was updated,
troubleshooting is complete. If the ECM/PCM was
substituted, replace the original ECM/PCM
(see page 11-228). If any other Temporary DTCs or
DTCs were indicated in step 25, go to the indicated
DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at the rocker arm oil
pressure switch and the ECM/PCM. If the ECM/PCM
was updated, substitute a known-good ECM/PCM
(see page 11-7), then go to step 24. If the ECM/PCM
was substituted, go to step 1. If the screen indicates
NOT COMPLETED, keep idling until a result comes
on. NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Do the VTEC TEST in the INSPECTION MENU with the HDS.
Intermittent failure, the system is OK at this
time. Check for poor connections or loose terminals
at the rocker arm oil control solenoid and the ECM/
PCM.
Go to step 4.
4. Turn the ignition switch to LOCK (0).
5. Disconnect the rocker arm oil control solenoid 2P connector.
6. At the solenoid side, measure the resistance between rocker arm oil control solenoid 2P
connector terminals No. 1 and No. 2.
Go to step 7.
Go to step 10.
(cont’d)Rocker Arm Oil Control Solenoid
Circuit Low Voltage
Terminal side of male terminals
Is DTC P2647 indicated?
Does t he scr een i nd i cat e PASSE D? Is the result OK ?
Is t her e 14 30 at r oom t emper at ur e?
08/08/21 14:28:26 61SNR030_110_0289
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NO YES
NO
YES
NO
YES
NO
11-290VTEC/VTC
DTC Troubleshooting (cont’d)
ECM/PCM CONNECTOR B (44P)
VTS (GRN/YEL)
7. Jump the SCS line with the HDS.
8. Disconnect ECM/PCM connector B (44P).
9. Check for continuity between ECM/PCM connectorterminal B34 and body ground.
Repair short in the wire between the ECM/
PCM (B34) and the rocker arm oil control solenoid,
then go to step 11.
Go to step 18.
10. Replace the rocker arm oil control valve (see page 11-296).
11. Reconnect all connectors.
12. Turn the ignition switch to ON (II).
13. Reset the ECM/PCM with the HDS.
14. Do the ECM/PCM idle learn procedure (see page 11-310).
15. Do the VTEC TEST in the INSPECTION MENU with the HDS. 16. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at the rocker arm oil control solenoid and
theECM/PCM,thengotostep1.
Go to step 17.
17. Monitor the OBD STATUS for DTC P2648 in the DTCs MENU with the HDS.
Troubleshooting is complete. If any other
Temporary DTCs or DTCs were indicated in step 16,
go to the indicated DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at the rocker arm oil
control solenoid and the ECM/PCM, then go to step
1. If the screen indicates NOT COMPLETED, go to
step 15.
18. Reconnect all connectors.
19. Update the ECM/PCM if it does not have the latest software (see page 11-227), or substitute a known-
good ECM/PCM (see page 11-7).
20. Do the VTEC TEST in the INSPECTION MENU with the HDS.
21. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at the rocker arm oil control solenoid and
the ECM/PCM. If the ECM/PCM was updated,
substitute a known-good ECM/PCM (see page 11-7),
then go to step 20. If the ECM/PCM was substituted,
go to step 1.
Go to step 22.
Terminal side of female terminals
Is there continuity? Is DTC P2648 indicated?
Does t he scr een i nd i cat e PASSE D?
Is DTC P2648 indicated?
08/08/21 14:28:26 61SNR030_110_0290
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YES
NO
YES
NO
YES
NO
DTC P2649:
11-29111-291
ROCKER ARM OIL CONTROL SOLENOID 2P CONNECTOR
22. Monitor the OBD STATUS for DTC P2648 in theDTCs MENU with the HDS.
If the ECM/PCM was updated,
troubleshooting is complete. If the ECM/PCM was
substituted, replace the original ECM/PCM
(see page 11-228). If any other Temporary DTCs or
DTCs were indicated in step 21, go to the indicated
DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at the rocker arm oil
control solenoid and the ECM/PCM. If the ECM/
PCM was updated, substitute a known-good ECM/
PCM (see page 11-7), then go to step 20. If the ECM/
PCM was substituted, go to step 1. If the screen
indicates NOT COMPLETED, go to step 20. NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in
neutral) until the radiator fan comes on, then let it
idle.
4. Check for Temporary DTCs or DTCs with the HDS.
Go to step 5.
Intermittent failure, the system is OK at this
time. Check for poor connections or loose terminals
at the rocker arm oil control solenoid and the ECM/
PCM.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the rocker arm oil control solenoid 2P connector.
7. At the solenoid side, measure the resistance between rocker arm oil control solenoid 2P
connector terminals No. 1 and No. 2.
Go to step 8.
Go to step 12.
(cont’d)Rocker Arm Oil Control Solenoid
Circuit High Voltage
Terminal side of male terminals
Does t he scr een i nd i cat e PASSE D?
Is DTC P2649 indicated?
Is t her e 14 30 at r oom t emper at ur e?
08/08/21 14:28:27 61SNR030_110_0291
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NO
11-292VTEC/VTC
DTC Troubleshooting (cont’d)
GND (BLK)
ROCKER ARM OIL CONTROL SOLENOID
2P CONNECTOR
ROCKER ARM OIL CONTROL SOLENOID 2P CONNECTOR
ECM/PCM CONNECTOR B (44P)
VTS (GRN/YEL)
VTS (GRN/YEL)
8. Check for continuity between rocker arm oil control
solenoid 2P connector terminal No. 1 and body
ground.
Go to step 9.
Repair open in the wire between the rocker
arm oil control solenoid and G101; A/T model
(see page 22-16), M/T model (see page 22-18), then
go to step 13.
9. Jump the SCS line with the HDS.
10. Disconnect ECM/PCM connector B (44P). 11. Check for continuity between ECM/PCM connector
terminal B34 and rocker arm oil control solenoid 2P
connector terminal No. 2.
Go to step 19.
Repair open in the wire between the ECM/
PCM (B34) and the rocker arm oil control solenoid,
then go to step 13.
12. Replace the rocker arm oil control valve (see page 11-296).
13. Reconnect all connectors.
14. Turn the ignition switch to ON (II).
15. Reset the ECM/PCM with the HDS.
16. Do the ECM/PCM idle learn procedure (see page 11-310).
17. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at the rocker arm oil control solenoid and
theECM/PCM,thengotostep1.
Go to step 18.
Wire side of female terminals Wire side of female terminals
Terminal side of female terminals
Is there continuity? Is there continuity?
Is DTC P2649 indicated?
08/08/21 14:28:27 61SNR030_110_0292
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NO
11-293
18. Monitor the OBD STATUS for DTC P2649 in the
DTCs MENU with the HDS.
Troubleshooting is complete. If any other
Temporary DTCs or DTCs were indicated in step 17,
go to the indicated DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at the rocker arm oil
control solenoid and the ECM/PCM, then go to step
1. If the screen indicates NOT COMPLETED, keep
idling until a result comes on.
19. Reconnect all connectors.
20. Update the ECM/PCM if it does not have the latest software (see page 11-227), or substitute a known-
good ECM/PCM (see page 11-7).
21. Start the engine, and let it idle.
22. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at the rocker arm oil control solenoid and
the ECM/PCM. If the ECM/PCM was updated,
substitute a known-good ECM/PCM (see page 11-7),
then go to step 21. If the ECM/PCM was substituted,
go to step 1.
Go to step 23. 23. Monitor the OBD STATUS for DTC P2649 in the
DTCs MENU with the HDS.
If the ECM/PCM was updated,
troubleshooting is complete. If the ECM/PCM was
substituted, replace the original ECM/PCM
(see page 11-228). If any other Temporary DTCs or
DTCs were indicated in step 22, go to the indicated
DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at the rocker arm oil
control solenoid and the ECM/PCM. If the ECM/
PCM was updated, substitute a known-good ECM/
PCM(seepage11-7),thengotostep21.IftheECM/
PCM was substituted, go to step 1. If the screen
indicates NOT COMPLETED, keep idling until a
result comes on.
Does t he scr een i nd i cat e PASSE D?
Is DTC P2649 indicated? Does t he scr een i nd i cat e PASSE D?
08/08/21 14:28:27 61SNR030_110_0293
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Closed
Open
11-294VTEC/VTC
VTC Oil Control Solenoid Valve Removal/Test/Installation
A
C
B
12 N·m
(1.2 kgf·m,
8.7 lbf·ft)
A VTC OIL CONTROL SOLENOID VALVE 2P CONNECTOR
BATTERY
A
1.2 mm
(0.05 in.)
1. Disconnect the VTC oil control solenoid valve 2P
connector.
2. Remove the ground wire (A).
3. Remove the bolt (B) and the VTC oil control solenoid valve (C).
4. Check the VTC oil control solenoid valve strainer for clogging. If the strainer is clogged, replace the
VTC oil control solenoid valve.
5. Note the amount of valve opening by observing the position of the piston shoulder (A) through the
valve retard drain port. If you see the shoulder of
the piston, the valve is open and must be replaced. 6. Connect the battery positive terminal to VTC oil
control solenoid valve 2P connector terminal No. 2.
7. Connect the battery negative terminal to VTC oil control solenoid valve 2P connector terminal No. 1.
Appearance of inner valve (A) in the port should be
at least 1.2 mm (0.05 in.). If the inner valve does not
open, replace it; then go to step 8.
Terminal side of male terminals
08/08/21 14:28:28 61SNR030_110_0294
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11-29511-295
CMP Sensor A Replacement
12 N·m
(1.2 kgf·m, 8.7 lbf·ft)
A
12 N·m
(1.2 kgf·m,
8.7 lbf·ft)
B
C
A
8. Remove the VTC valve O-ring (A).
9. Coat a new O-ring with new engine oil, then install
it on the valve.
10. Clean and dry the mating surface of the valve.
11. Install the valve. NOTE: Do not install the valve while wearing cloth
fibrous gloves. Be careful not to contaminate the
cylinder head opening. 1. Remove the air cleaner (see page 11-345).
2. Disconnect CMP sensor A 3P connector (A).
3. Remove CMP sensor A (B) from the intake
camshaft side of the cylinder head.
4. Install the parts in the reverse order of removal with a new O-ring (C).
08/08/21 14:28:28 61SNR030_110_0295
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11-29511-295
CMP Sensor A Replacement
12 N·m
(1.2 kgf·m, 8.7 lbf·ft)
A
12 N·m
(1.2 kgf·m,
8.7 lbf·ft)
B
C
A
8. Remove the VTC valve O-ring (A).
9. Coat a new O-ring with new engine oil, then install
it on the valve.
10. Clean and dry the mating surface of the valve.
11. Install the valve. NOTE: Do not install the valve while wearing cloth
fibrous gloves. Be careful not to contaminate the
cylinder head opening. 1. Remove the air cleaner (see page 11-345).
2. Disconnect CMP sensor A 3P connector (A).
3. Remove CMP sensor A (B) from the intake
camshaft side of the cylinder head.
4. Install the parts in the reverse order of removal with a new O-ring (C).
08/08/21 14:28:28 61SNR030_110_0295
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