Test Procedure
WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
- RE1 PRELIMINARY DIAGNOSIS
Are DTCs P20A0, P20A2 or P20A3 present?
Yes No GO to RE2 . Unable to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the concern. REPAIR as necessary.
RETURN to ENGINE CONTROLS - SYMPTOM CHARTS (DIESEL) , Symptom Charts for further direction. - RE2 CHECK THE REDUCTANT PURGE VALVE SOLENOID RESISTANCE
- Ignition OFF.
- Reductant Purge Valve connector disconnected.
- Measure the resistance between:
(+) Reductant Purge Valve Connector, Component Side (-) Reductant Purge Valve Connector, Component Side RDPGC - Pin 1 VPWR - Pin 2
Is the resistance between 9.72 - 11.88 ohms?
Yes No GO to RE3 . INSTALL a new Reductant Pump assembly. REFER to the appropriate Engine Emission Control article.
Clear the PCM DTCs. REPEAT the self-test. - RE3 CHECK THE REDUCTANT PURGE VALVE SOLENOID FOR INTERNAL SHORTS
- Measure the resistance between:
(+) Reductant Purge Valve Connector, Component Side (-) RDPGC - Pin 1 Ground
Is the resistance greater than 10K ohms?
Yes No GO to RE4 . INSTALL a new Reductant Pump assembly. REFER to the appropriate Engine Emission Control article.
Clear the PCM DTCs. REPEAT the self-test. - Measure the resistance between:
- RE4 CHECK THE VPWR CIRCUIT FOR VOLTAGE
- Ignition ON, engine OFF.
- Measure the voltage between:
(+) Reductant Purge Valve Connector, Harness Side (-) VPWR - Pin 2 Ground
Is the voltage greater than 10 V?
Yes No GO to RE5 . REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test. - RE5 CHECK THE RDPGC CIRCUIT FOR AN OPEN
- Ignition OFF.
- PCM-T connector disconnected.
- Measure the resistance between:
(+) Reductant Purge Valve Connector, Harness Side (-) PCM-T Connector, Harness Side RDPGC - Pin 1 RDPGC - Pin 16
Is the resistance less than 5 ohms?
Yes No GO to RE6 . REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test. - RE6 CHECK THE RDPGC CIRCUIT FOR A SHORT TO GROUND
Is the resistance greater than 10K ohms?
Yes No GO to RE7 . REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. - RE7 CHECK THE RDPGC CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition ON, engine OFF.
- Measure the voltage between:
(+) PCM-T Connector, Harness Side (-) RDPGC - Pin 16 Ground
Is any voltage present?
Yes No REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. GO to RE8 . - RE8 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.
- 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.