Intake Manifold Runner Position Sensor/Switch Circuit Bank 1
The Manifold Runner Position Sensor detects the position of the intake manifold runner control (IMRC) valve on Bank 1. This code sets when the PCM detects an electrical or mechanical fault in the sensor circuit or the IMRC valve itself, preventing proper intake manifold tuning.
What You Might Notice
- Check Engine Light illuminated
- Loss of engine power or reduced acceleration
- Occasional misfires during acceleration
- Poor fuel economy
- Rough idle
Most Common Causes
- 1
Sticking or faulty IMRC valve
The intake manifold runner control valve becomes stuck due to carbon buildup or mechanical failure, preventing it from moving freely and triggering the position sensor fault.
- 2
Faulty manifold runner position sensor
The sensor develops an electrical fault, fails to read correctly, or loses connection, causing the PCM to detect an out-of-range signal.
- 3
Faulty IMRC actuator
The actuator that controls the IMRC valve malfunctions or loses electrical connection, preventing proper valve operation and sensor feedback.
- 4
Wiring or connector issues in IMRC circuit
Corroded, damaged, or loose connectors and wiring in the IMRC sensor or actuator circuit prevent proper electrical communication with the PCM.
How to Diagnose It
- 1
Check Sticking or faulty IMRC valve — The intake manifold runner control valve becomes stuck due to carbon buildup or mechanical failure, preventing it from moving freely and triggering the position sensor fault.
- 2
Check Faulty manifold runner position sensor — The sensor develops an electrical fault, fails to read correctly, or loses connection, causing the PCM to detect an out-of-range signal.
- 3
Check Faulty IMRC actuator — The actuator that controls the IMRC valve malfunctions or loses electrical connection, preventing proper valve operation and sensor feedback.
- 4
Check Wiring or connector issues in IMRC circuit — Corroded, damaged, or loose connectors and wiring in the IMRC sensor or actuator circuit prevent proper electrical communication with the PCM.
How to Fix It
- 1
Clean or replace IMRC valve
Remove the intake manifold and inspect the IMRC valve for carbon buildup or mechanical damage. Clean the valve with appropriate solvents or replace if faulty. Ensure the valve moves freely before reassembly.
- 2
Inspect and repair wiring and connectors
Check all connectors and wiring in the IMRC sensor circuit for corrosion, damage, or loose connections. Clean corroded terminals with electrical contact cleaner and reconnect securely. Replace damaged wiring as needed.
- 3
Replace manifold runner position sensor
Remove the faulty sensor from the intake manifold and install a new OEM or equivalent sensor. Verify proper electrical connection before starting the engine.
- 4
Replace IMRC actuator
If testing confirms the actuator is faulty, remove the old actuator assembly and install a replacement. Ensure all connectors are secure and test valve operation.
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