Intake Manifold Runner Control (IMRC) System Troubleshooting

1.Start the engine and allow it to idle.

2.Disconnect the vacuum hose (A) from Intake Manifold Runner Control (IMRC) actuator (B), and connect the vacuum/ gauge (C) to the hose.

 

Is there vacuum?


YES - Go to 10.


NO - Go to 3.


3.Check the vacuum hose between IMRC actuator and IMRC solenoid valve.

Is there vacuum hose OK?


YES - Go to 4.


NO - Repair the blockage or vacuum leak between the IMRC actuator and IMRC solenoid valve.n

4.Disconnect the lower vacuum hose (A) from IMRC solenoid valve (B), and connect the vacuum/gauge (C) to the hose.

 

Is there vacuum?


YES - Go to 5.


NO - Repair the blockage or vacuum leak between the intake manifold and IMRC solenoid valve.n


5.Reconnect the lower vacuum hose to the IMRC solenoid valve, and connect the vacuum pump/ gauge to the vacuum hose (actuator side).

6.Disconnect the IMRC solenoid valve 2P connector.

Is there vacuum?


YES - Go to 7.


NO - Replace the IMRC solenoid valve.n

7.Turn the ignition switch OFF.

8.Disconnect the negative cable from the battery.

9.Disconnect ECM/PCM connector B (24P).

10.Check for continuity between IMRC solenoid valve 2P connector terminal No. 2 and body ground.

 

Is there continuity?


YES - Repair short in the wire between the  ECM/ PCM (B22) and the IMRC solenoid valve.n


NO - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original  ECM/ PCM.n


11.Raise engine speed to 5,000 rpm (min-1).

12.Check for vacuum.

Is there vacuum?


YES - Go to 13.


NO - Go to 23.


13.Turn the ignition switch OFF.

14.Disconnect the IMRC solenoid valve 2P connector.

15.Start the engine.

16.Raise engie speed to 5,000 rpm (min-1), then measure voltage between IMRC solenoid valve 2P connector terminal No. 1 and No. 2.

 

Is there battery voltage?


YES - Replace the IMRC solenoid valve.n


NO - Go to 17.


17.Measure voltage between IMRC solenoid valve 2P connector terminal No. 1 and body ground.

 

Is there battery voltage?


YES - Go to 18.


NO - Check the No. 4 ACG (10A) fuse in the under-dash fuse/relay box. If the fuse OK, repair open in the wire between the IMRC solenoid valve and No. 4 ACG (10A) fuse.

18.Turn the ignition switch OFF.

19.Disconnect the negative cable from the battery.

20.Disconnect ECM/PCM connector B (24P).

21.Connect IMRC solenoid valve 2P connector terminal No. 2 to body ground with a jumper wire.

 


22.Check for continuity between ECM/PCM connector terminal B22 and body ground.

 

Is there continuity?


YES - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original  ECM/ PCM.n


NO - Repair open in the wire between the  ECM/ PCM (B22) and the IMRC solenoid valve.n

23.Connect the vacuum/ gauge (A) to the IMRC actuator (B), then apply vacuum.

 

Does the IMRC actuator hold vacuum?


YES - Go to 24.


NO - Replace the IMRC valve assembly.n


24.Install the cotter pin (A) to the IMRC actuator shaft (B).

 


25.Apply vacuum to the IMRC actuator, then check the cotter pin movement.

Does the cotter pin move?


YES - IMRC system is OK.n


NO - Replace the IMRC valve assembly.n