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Acura RSX Honda Integra. Manual - part 172

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DTC P1077:

Special Tools Required

YES

11-394

Intake Air System

DTC Troubleshooting (cont’d)

IMT (IMRC) System Malfunction

(Low rpm) Stuck Short
(2005-2006 models)

Vacuum pump/gauge, 0

30 in.Hg, Snap-on YA4000A

or equivalent, commercially available

1. 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. Do the IMT (IMRC) TEST in the INSPECTION MENU

with the HDS.

Intermittent failure, system is OK at this time.

Check for poor connections or loose terminals at
the intake manifold tuning (IMT) (intake manifold
runner control (IMRC)) solenoid valve and the ECM/
PCM.

Go to step 3.

3. Turn the ignition switch OFF.

4. Check the vacuum hose and the hose connectors

between the IMT (IMRC) actuator and the IMT
(IMRC) solenoid valve.

Go to step 5.

Repair the blockage or vacuum leak between

the IMT (IMRC) actuator and the IMT (IMRC)
solenoid valve, then go to step 27.

5. Disconnect the vacuum hose (A) from the IMT

(IMRC) actuator (B), and connect the vacuum
pump/gauge, 0

30 in.Hg, to the hose.

6. Start the engine.

7. Measure the vacuum.

Go to step 8.

Go to step 13.

8. Turn the ignition switch OFF.

Is the r esult OK ?

Ar e the vacuum hose and the hose connector s
OK ?

Is ther e vacuum?

05/06/27 17:42:31 61S6M040_110_0394

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YES

11-395

9. Reconnect the vacuum hose to the IMT (IMRC)

actuator.

10. Disconnect the vacuum hose (A) from the IMT

(IMRC) solenoid valve (B), and connect the vacuum
pump/gauge, 0

30 in.Hg, to the hose.

Go to step 11.

Replace the IMT (IMRC) valve (see page

11-413), then go to step 27.

11. Do the IMT (IMRC) TEST in the INSPECTION MENU

with the HDS.

12. Apply 28 kPa (8.27 in.Hg, 210 mmHg) of vacuum to

the hose.

Go to step 34.

Replace the IMT (IMRC) valve (see page

11-413), then go to step 27.

13. Turn the ignition switch OFF.

14. Connect the vacuum hose to the IMT (IMRC)

actuator.

15. Disconnect the lower vacuum hose (A) from the

IMT (IMRC) solenoid valve (B), and connect the
vacuum pump/gauge, 0

30 in.Hg, to the hose.

16. Start the engine.

17. Measure the vacuum.

Go to step 20.

Go to step 18.

18. Turn the ignition switch OFF.

19. Check the vacuum hose and the hose connectors

between the intake manifold and the IMT (IMRC)
solenoid valve.

Replace the intake manifold, K20Z1 engine

(see page 9-8), K20A3 engine (see page 9-2), then
go to step 27.

Repair the blockage or vacuum leak between

the intake manifold and the IMT (IMRC) solenoid
valve, then go to step 27.

(cont’d)

Does the IMT ( IMRC) actuator hold vacuum?

Does the r eading on the HDS change?

Is ther e vacuum?

Ar e the vacuum hose and the hose connector s
OK ?

05/06/27 17:42:31 61S6M040_110_0395

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YES

11-396

Intake Air System

DTC Troubleshooting (cont’d)

IMT (IMRC) SOLENOID VALVE
2P CONNECTOR

IMT (IMRC)
(RED/BLU)

IMT (IMRC) SOLENOID VALVE
2P CONNECTOR

IMT (IMRC)
(RED/BLU)

20. Turn the ignition switch OFF.

21. Disconnect the IMT (IMRC) solenoid valve 2P

connector.

22. Check for continuity between IMT (IMRC) solenoid

valve 2P connector terminal No. 2 and body ground.

Go to step 23.

Replace the IMT (IMRC) solenoid valve

(see page 11-413), then go to step 27.

23. Turn the ignition switch OFF.

24. Jump the SCS line with the HDS.

25. Disconnect ECM/PCM connector A (31P).

26. Check for continuity between IMT (IMRC) solenoid

valve 2P connector terminal No. 2 and body ground.

Repair short in the wire between the IMT

(IMRC) solenoid valve and the ECM/PCM (A11),
then go to step 27.

Go to step 34.

27. Reconnect all connectors.

28. Turn the ignition switch ON (II).

29. Reset the ECM/PCM with the HDS.

Wire side of female terminals

Is ther e continuity?

05/06/27 17:42:32 61S6M040_110_0396

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YES

11-397

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

11-349).

31. Do the IMT (IMRC) TEST in the INSPECTION MENU

with the HDS.

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

If DTC P1077 is indicated, check for poor

connections or loose terminals at the IMT (IMRC)
solenoid valve and the ECM/PCM, then go to step 1.
If any other Temporary DTCs or DTCs are indicated,
go to the indicated DTC’s troubleshooting.

Go to step 33.

33. Monitor the OBD STATUS for DTC P1077 in the

DTCs MENU with the HDS.

Troubleshooting is complete.

If the screen indicates FAILED, check for poor

connections or loose terminals at the IMT (IMRC)
solenoid valve and the ECM/PCM, then go to step 1.
If the screen indicates NOT COMPLETED, go to step
30 and recheck.

34. Update the ECM/PCM if it does not have the latest

software, or substitute a known-good ECM/PCM
(see page 11-6).

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

If DTC P1077 is indicated, check for poor

connections or loose terminals at the IMT (IMRC)
solenoid valve and the ECM/PCM, then go to step 1.
If any other Temporary DTCs or DTCs are indicated,
go to the indicated DTC’s troubleshooting.

If the ECM/PCM was updated, troubleshooting

is complete. If the ECM/PCM was substituted,
replace the original ECM/PCM (see page 11-284).

Ar e any T empor ar y DT Cs or DT Cs indicated?

Does the scr een indicate PASSED?

Ar e any T empor ar y DT Cs or DT Cs indicated?

05/06/27 17:42:32 61S6M040_110_0397

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