Intake Manifold Runner Control Valve, Checking

Intake Manifold Runner Control Valve, Checking

Special tools, testers and auxiliary items required
- Multimeter.
- Wiring diagram.

Test requirements
- The Intake Manifold Runner Control (IMRC) Valve N316 fuse OK.
- The Engine Component Power Supply Relay J757 OK.
- The parking brake engaged.
- The battery voltage at least 12.5 V.
- The selector lever of automatic transmission in position "P" or "N".
- All electrical consumers switched off (radiator fan must NOT run during test).
- A/C switched off.
- The fuel tank at least 1/4 filled.
- The ignition switched off.

Test procedure
- Perform a preliminary check to verify the customers complaint. Preliminary Check

Start diagnosis







- Remove the rear engine cover - arrows -.







- Disconnect the Intake Manifold Runner Control (IMRC) Valve N316 electrical harness connector - 5 -.

Checking internal resistance







- Using a Multimeter, check the Intake Manifold Runner Control (IMRC) Valve N316 terminals 1 to 2 for resistance

Intake Manifold Runner Control (IMRC) Valve N316 terminals
1 to 2

Specified value: 450 to 1000 Ohms.

If the specified value was not obtained:
- Replace the Intake Manifold Runner Control (IMRC) Valve N316.

If the specified value was obtained:

Checking voltage
Switch the ignition on.







- Using a Multimeter, check the Intake Manifold Runner Control (IMRC) Valve N316 electrical harness connector terminal 1 to ground (GND) for voltage.

Specified value: battery voltage.

- Switch the ignition off.

If the specified value was not obtained:
- Check the wiring from the Intake Manifold Runner Control (IMRC) Valve N316 electrical harness connector terminal 1 to the Engine Component Power Supply Relay J271 terminal 2/87 for a short circuit to Ground (GND), or an open circuit.
- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
- If necessary, repair the wiring connection.

If no malfunctions are found in the wiring:

Checking wiring
If the manufacturers test box is being used. Perform the following step.
- Install the test box.

If the manufacturers test box is not being used. Perform the following step.
- Remove the Motronic Engine Control Module (ECM) J623.
- Using a multimeter, check the Intake Manifold Runner Control (IMRC) Valve N316 electrical harness connector terminal 2 to the Engine Control Module (ECM) J623 electrical harness connector T60 terminal 35 for an open circuit.

Intake Manifold Runner Control Engine Control Module (ECM) J623
(IMRC) Valve N316 electrical electrical harness connector T60
harness connector terminal terminal or test box socket
2 6

Specified value: 1.5 Ohms Max.

If the specification was not obtained:
- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
- If necessary, repair the faulty wiring connection.
- Erase the DTC memory. Diagnostic Modes 01 - 09
- Perform a road test to verify repair.

If the DTC does not return:
Repair complete, Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:
- Replace the Motronic Engine Control Module (ECM) J623.
- Assembly is performed in the reverse of the removal.

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:

1. Check the DTC memory. Diagnostic Modes 01 - 09
2. If necessary, erase the DTC memory. Diagnostic Modes 01 - 09
3. If the DTC memory was erased, generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

End of Diagnosis