Test Procedure
WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
- HU1 DTCS P2004, P2006, P2008 AND P2279: CHECK FOR SELF-TEST DTCS
Are any of the following DTCs present during the PCM self-test: P2004, P2006, P2008, or P2279?
Yes No For DTCs P2004, P2006 or P2008, GO to HU5.
For DTC P2279, GO to HU2.GO to HU2. - HU2 CHECK THE INTAKE AIR SYSTEM FOR LEAKS, OBSTRUCTIONS AND DAMAGE
- Remove the air cleaner element. Check the air cleaner for restrictions.
- Check for restrictions between the air inlet and the throttle body.
Are any restriction concerns present?
Yes No REMOVE the restriction. INSTALL the air cleaner element. INSTALL a new air cleaner element. GO to HU3. - HU3 CHECK FOR VACUUM LEAKS
- Listen for vacuum leaks from the following:
- cracked or punctured inlet air tube.
- loose connections on the inlet air tube at the air cleaner housing or throttle body.
- intake manifold assembly or gasket.
- vacuum supply connectors and hose.
Are any concerns present?
Yes No Key in OFF position.
REPAIR as necessary.GO to HU4. - Listen for vacuum leaks from the following:
- HU4 CHECK THE THROTTLE BODY FOR EXCESSIVE WEAR
- Key in OFF position.
- Remove the throttle body assembly. Refer to FUEL CHARGING & CONTROLS - HYBRID .
- Inspect the throttle body for:
- excessive wear or grooving in the throttle bore.
- misaligned or worn throttle plate.
- excessive gap between the throttle bore and plate.
Are any concerns present?
Yes No INSTALL a new throttle body assembly. The concern is elsewhere. RETURN to SYMPTOM CHARTS for further direction. - HU5 DTCS P2004, P2006 AND P2008: VISUAL INSPECTION
- Visually inspect the IMRC linkage for binding or obstructions. Check the IMRC lever/linkage for movement. There may be some tension in one direction but there should be full travel.
- Manually open and close the IMRC plates at the intake manifold and check for sticking or binding.
Are any concerns present?
Yes No GO to HU6. GO to HU7. - HU6 CHECK THE IMRC FOR MECHANICAL OPERATION NOTE: The IMRC return spring is strong - approximately 0.34 to 0.45 Nm (3 to 4 in-lb).
- Disconnect the IMRC linkage from the manifold.
- Rotate the IMRC plate lever fully open and fully closed, contacting both limits.
- Check for sticking or binding during rotation.
Are any concerns present?
Yes No REPAIR as necessary. INSTALL a new IMRC actuator. - HU7 CHECK THE VACUUM HOSES RELATED TO THE IMRC SYSTEM
- Inspect the vacuum hose between the engine intake manifold and the IMRC actuator.
- Inspect the vacuum hose between the IMRC actuator and the IMRC linkage.
Are any concerns present?
Yes No REPAIR as necessary. GO to HU8. - HU8 VERIFY NORMAL OPERATION OF THE IMRC SYSTEM
- Key in OFF position.
- IMRC Actuator connector disconnected.
- Connect a non-powered test lamp between:
( + ) IMRC Actuator Connector, Harness Side ( - ) IMRC Actuator Connector, Harness Side VPWR - Pin 1 IMRC - Pin 2 - Key ON, engine OFF.
Does the test lamp illuminate with the key in the ON position?
Yes No GO to HU17. GO to HU9. - HU9 CHECK THE VPWR CIRCUIT FOR AN OPEN IN THE HARNESS
Is the voltage greater than 10.5 V?
Yes No GO to HU10. REPAIR the open circuit. - HU10 CHECK FOR AN INTERMITTENT OPEN IN THE VPWR CIRCUIT
- Key ON, engine OFF.
- Measure the voltage between:
( + ) IMRC Actuator Connector, Harness Side ( - ) VPWR - Pin 1 Ground - While observing the DMM shake, wiggle, and bend the VPWR circuit. Note that voltage will suddenly change when the fault is detected.
Is a concern present?
Yes No REPAIR as necessary. GO to HU11. - HU11 CHECK THE IMRC CIRCUIT FOR AN OPEN IN THE HARNESS
- Key in OFF position.
- PCM connector disconnected.
- Measure the resistance between:
( + ) IMRC Actuator Connector, Harness Side ( - ) PCM Connector, Harness Side IMRC - Pin 2 IMRC - Pin E28
Is the resistance less than 5 ohms?
Yes No GO to HU12. REPAIR the open circuit. - HU12 CHECK FOR AN INTERMITTENT OPEN IN THE IMRC CIRCUIT
- Measure the resistance between:
( + ) IMRC Actuator Connector, Harness Side ( - ) PCM Connector, Harness Side IMRC - Pin 2 IMRC - Pin E28 - While observing the DMM shake, wiggle, and bend the IMRC circuit. Note that resistance will suddenly change when the fault is detected.
Is a concern present?
Yes No REPAIR as necessary. GO to HU13. - Measure the resistance between:
- HU13 CHECK THE IMRC CIRCUIT FOR A SHORT TO PWR IN THE HARNESS
- Key ON, engine OFF.
- Measure the voltage between:
( + ) IMRC Actuator Connector, Harness Side ( - ) IMRC - Pin 2 Ground
Is any voltage present?
Yes No Key in OFF position. REPAIR the short circuit to PWR. GO to HU14. - HU14 CHECK FOR AN INTERMITTENT SHORT TO PWR IN THE IMRC CIRCUIT
- Key ON, engine OFF.
- Measure the voltage between:
( + ) IMRC Actuator Connector, Harness Side ( - ) IMRC - Pin 2 Ground - While observing the DMM shake, wiggle, and bend the IMRC circuit. Note that voltage will suddenly change when the fault is detected.
Is a concern present?
Yes No Key in OFF position.
REPAIR as necessary.GO to HU15. - HU15 CHECK THE IMRC DRIVER CIRCUIT FOR A SHORT TO THE IMRCM CIRCUIT
- Key in OFF position.
- IMRCM Sensor connector disconnected.
- Measure the resistance between:
( + ) IMRC Actuator Connector, Harness Side ( - ) IMRCM Sensor Connector, Harness Side IMRC - Pin 2 IMRCM - Pin 1
Is the resistance greater than 10K ohms?
Yes No GO to HU16. REPAIR the short circuit. - HU16 CHECK THE IMRC DRIVER CIRCUIT FOR AN INTERMITTENT SHORT TO THE IMRCM CIRCUIT
- Key in OFF position.
- Measure the resistance between:
( + ) IMRC Actuator Connector, Harness Side ( - ) IMRCM Sensor Connector, Harness Side IMRC - Pin 2 IMRCM - Pin 1 - While observing the DMM shake, wiggle, and bend the IMRC and IMRCM circuits. Note that resistance will suddenly change when the fault is detected.
Is a concern present?
Yes No REPAIR as necessary. GO to HU30. - HU17 CHECK THE IMRC ACTUATOR RESISTANCE
- Key in OFF position.
- Measure the resistance between:
( + ) IMRC Actuator Connector, Component Side ( - ) IMRC Actuator Connector, Component Side IMRC - Pin 2 VPWR - Pin 1
Is the resistance between 32 ohms - 40 ohms?
Yes No GO to HU18. INSTALL a new IMRC actuator. - HU18 CHECK THE IMRC CIRCUIT FOR A SHORT TO GROUND
- Key in OFF position.
- PCM connector disconnected.
- Measure the resistance between:
( + ) IMRC Actuator Connector, Harness Side ( - ) IMRC - Pin 2 Ground
Is the resistance greater than 10K ohms?
Yes No GO to HU19. REPAIR the short circuit to GND. - HU19 CHECK FOR AN INTERMITTENT SHORT TO GROUND IN THE IMRC CIRCUIT
- Measure the resistance between:
( + ) IMRC Actuator Connector, Harness Side ( - ) IMRC - Pin 2 Ground - While observing the DMM shake, wiggle, and bend the IMRC circuit. Note that resistance will suddenly change when the fault is detected.
Is a concern present?
Yes No REPAIR as necessary. GO to HU20. - Measure the resistance between:
- HU20 CHECK THE VREF VOLTAGE TO THE IMRCM SENSOR
- IMRCM Sensor connector disconnected.
- Key ON, engine OFF.
- Measure the voltage between:
( + ) IMRCM Sensor Connector, Harness Side ( - ) IMRCM Sensor Connector, Harness Side SIGRTN - Pin 2 VREF - Pin 3
Is the voltage between 4.5 V - 5.5 V?
Yes No GO to HU21. Key in OFF position.
GO to Pinpoint Test C . - HU21 CHECK THE IMRCM CIRCUIT FOR AN OPEN IN THE HARNESS
- Key in OFF position.
- Measure the resistance between:
( + ) IMRCM Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side IMRCM - Pin 1 IMRCM - Pin E29
Is the resistance less than 5 ohms?
Yes No GO to HU22. REPAIR the open circuit. - HU22 CHECK FOR AN INTERMITTENT OPEN IN THE IMRCM CIRCUIT
- Measure the resistance between:
( + ) IMRCM Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side IMRCM - Pin 1 IMRCM - Pin E29 - While observing the DMM shake, wiggle, and bend the IMRCM circuit. Note that resistance will suddenly change when the fault is detected.
Is a concern present?
Yes No REPAIR as necessary. GO to HU23. - Measure the resistance between:
- HU23 CHECK THE IMRCM CIRCUIT FOR A SHORT TO PWR IN THE HARNESS
- Key ON, engine OFF.
- Measure the voltage between:
( + ) IMRCM Sensor Connector, Harness Side ( - ) IMRCM - Pin 1 Ground
Is any voltage present?
Yes No Key in OFF position. REPAIR the short circuit to PWR. GO to HU24. - HU24 CHECK FOR AN INTERMITTENT SHORT TO POWER IN THE IMRCM CIRCUIT
- Key ON, engine OFF.
- Measure the voltage between:
( + ) IMRCM Sensor Connector, Harness Side ( - ) IMRCM - Pin 1 Ground - While observing the DMM shake, wiggle, and bend the IMRCM circuit. Note that voltage will suddenly change when the fault is detected.
Is a concern present?
Yes No Key in OFF position.
REPAIR as necessary.GO to HU25. - HU25 CHECK THE IMRCM CIRCUIT FOR A SHORT TO GROUND
- Key in OFF position.
- PCM connector disconnected.
- Measure the resistance between:
( + ) IMRCM Sensor Connector, Harness Side ( - ) IMRCM - Pin 1 Ground
Is the resistance greater than 10K ohms?
Yes No GO to HU26. REPAIR the short circuit to GND. - HU26 CHECK FOR AN INTERMITTENT SHORT TO GROUND IN THE IMRCM CIRCUIT
- Measure the resistance between:
( + ) IMRCM Sensor Connector, Harness Side ( - ) IMRCM - Pin 1 Ground - While observing the DMM shake, wiggle, and bend the IMRCM circuit. Note that resistance will suddenly change when the fault is detected.
Is a concern present?
Yes No REPAIR as necessary. GO to HU27. - Measure the resistance between:
- HU27 CHECK THE IMRC DRIVER CIRCUIT FOR A SHORT TO THE IMRCM CIRCUIT
- Key in OFF position.
- Measure the resistance between:
( + ) IMRC Actuator Connector, Harness Side ( - ) IMRCM Sensor Connector, Harness Side IMRC - Pin 2 MRCM - Pin 1
Is the resistance greater than 10K ohms?
Yes No GO to HU28. REPAIR the short circuit. - HU28 CHECK THE IMRC DRIVER CIRCUIT FOR AN INTERMITTENT SHORT TO THE IMRCM CIRCUIT
- Key in OFF position.
- Measure the resistance between:
( + ) IMRC Actuator Connector, Harness Side ( - ) IMRCM Sensor Connector, Harness Side IMRC - Pin 2 IMRCM - Pin 1 - While observing the DMM shake, wiggle, and bend the IMRC and IMRCM circuits. Note that resistance will suddenly change when the fault is detected.
Is a concern present?
Yes No REPAIR as necessary. GO to HU29. - HU29 CHECK THE IMRCM CIRCUIT FOR A SHORT TO VREF AND SIGRTN IN THE HARNESS
- Measure the resistance between:
( + ) IMRCM Sensor Connector, Harness Side ( - ) IMRCM Sensor Connector, Harness Side IMRCM - Pin 1 VREF - Pin 3 IMRCM - Pin 1 SIGRTN - Pin 2
Are the resistances greater than 10K ohms?
Yes No INSTALL a new IMRC actuator.
REPAIR as necessary.REPAIR the short circuit. - Measure the resistance between:
- HU30 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Visually inspect for:
- pushed out pins.
- corrosion.
- Connect all the PCM connectors and make sure they seat correctly.
- Carry out the PCM self-test and verify the concern is still present.
Is the concern still present?
Yes No INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.