Acura CSX. Instruction — page 153

01

02

YES

NO

YES

NO

YES

NO

11-285

07406-0020201 or
07MAJ-PY4011A and
07MAJ-PY40120

A
22 N·m
(2.2 kgf·m,
16 lbf·ft)

07406-0070301

B
07NAJ-P07010A

07ZAJ-S5AA200

ECM/PCM CONNECTOR C (44P)

VTPSW (BLU/BLK)

8. Check the VTEC PRES SW in the DATA LIST with

the HDS.

Go to step 16.

Go to step 9.

9. Turn the ignition switch to LOCK (0).

10. Remove the cowl cover and the under cowl panel

(see page 20-163).

11. Remove the rocker arm oil pressure switch (A), and

attach the special tools as shown, then attach the
rocker arm oil pressure switch to the oil pressure
gauge attachment (B).

NOTE: Install the parts in the reverse order of
removal with a new O-ring.

12. Reconnect the rocker arm oil pressure switch 2P

connector.

13. Start the engine.

14. Do the VTEC TEST in the INSPECTION MENU with

the HDS.

15. Check the oil pressure.

Replace the rocker arm oil pressure switch

(see page 11-296), then go to step 20.

Inspect the following items. If they are OK,

replace the rocker arm oil control valve (see page
11-296), then go to step 19.

• VTEC systems oil line
• Operation of the rocker arm (see page 6-8).

16. Turn the ignition switch to LOCK (0).

17. Jump the SCS line with the HDS.

18. Disconnect ECM/PCM connector C (44P).

19. Check for continuity between ECM/PCM connector

terminal C22 and body ground.

Repair short in the wire between the ECM/

PCM (C22) and the rocker arm oil pressure switch,
then go to step 20.

Go to step 27.

20. Reconnect all connectors.

21. Turn the ignition switch to ON (II).

22. Reset the ECM/PCM with the HDS.

Terminal side of female terminals

Is SW IT CH ON indicated?

Does the oil pr essur e incr ease to at least 392 kPa
( 4.0 kgf / cm , 56.9 psi)?

Is ther e continuity?

2

08/08/21 14:28:25 61SNR030_110_0285

YES

NO

YES

NO

YES

NO

YES

NO

11-286

VTEC/VTC

23. Do the ECM/PCM idle learn procedure (see page

11-310).

24. Do the VTEC TEST in the INSPECTION MENU with

the HDS.

25. 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 valve, and the ECM/PCM,
then go step 1.

Go to step 26.

26. Monitor the OBD STATUS for DTC P2646 in the

DTCs MENU with the HDS.

Troubleshooting is complete. 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, the rocker arm oil control valve,
and the ECM/PCM, then go to step 1. If the screen
indicates NOT COMPLETED, go to step 24 and
recheck.

27. Reconnect all connectors.

28. 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).

29. Do the VTEC TEST in the INSPECTION MENU with

the HDS.

30. 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.
If the ECM/PCM was updated, substitute a known-
good ECM/PCM (see page 11-7), then go to step 29.
If the ECM/PCM was substituted, go to step 1.

Go to step 31.

31. Monitor the OBD STATUS for DTC P2646 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 30, 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. If the ECM/PCM was updated,
substitute a known-good ECM/PCM (see page 11-7),
then go to step 29. If the ECM/PCM was substituted,
go to step 1. If the screen indicates NOT
COMPLETED, go to step 29 and recheck.

Is DT C P2646 indicated?

Does the scr een indicate PASSED?

Is DT C P2646 indicated?

Does the scr een indicate PASSED?

08/08/21 14:28:25 61SNR030_110_0286

01

02

SNR9AA7K72100092647FAAT30

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.

Terminal side of male terminals

Wire side of female terminals

Is the engine oil level OK ?

Is the r esult OK ?

Is the test r esult any of above?

Is ther e continuity?

Is ther e batter y voltage?

08/08/21 14:28:25 61SNR030_110_0287

03

YES

NO

YES

NO

YES

NO

11-288

VTEC/VTC

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 oil

pressure 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 ther e continuity?

Is DT C P2647 indicated?

Does the scr een indicate PASSED?

08/08/21 14:28:26 61SNR030_110_0288

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