Test Procedure

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

RJ1 PRELIMINARY DIAGNOSIS

Are DTCs P203A, P203B, P203C, P203D, P21AB or P21B0 present?

Yes	No
GO to RJ2.	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. REFER to NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX , if a driveability concern exists.

RJ2 CHECK THE REDUCTANT LEVEL CIRCUITS FOR AN OPEN

Ignition OFF.
Reductant Heater and Sender Assembly connector disconnected.
PCM-T connector disconnected.

Measure the resistance between:

(+) Reductant Heater and Sender Assembly Connector, Harness Side	(-) PCM-T Connector, Harness Side
RDL1 - Pin 6	RDL1 - Pin 15
RDL2 - Pin 7	RDL2 - Pin 18
RDL3 - Pin 8	RDL3 - Pin 19
RDLRTN - Pin 5	RDLRTN - Pin 32

Are the resistances less than 5 ohms?

Yes	No
GO to RJ3.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

RJ3 CHECK THE REDUCTANT LEVEL CIRCUITS FOR A SHORT TO GROUND

Measure the resistance between:

(+) PCM-T Connector, Harness Side	(-)
RDL1 - Pin 15	Ground
RDL2 - Pin 18	Ground
RDL3 - Pin 19	Ground
RDLRTN - Pin 32	Ground

Are the resistances greater than 10K ohms?

Yes	No
GO to RJ4.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

RJ4 CHECK THE REDUCTANT LEVEL CIRCUITS FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) PCM-T Connector, Harness Side	(-)
RDL1 - Pin 15	Ground
RDL2 - Pin 18	Ground
RDL3 - Pin 19	Ground
RDLRTN - Pin 32	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to RJ5.

RJ5 CHECK THE REDUCTANT LEVEL SENSOR FOR CORRECT OPERATION

Ignition OFF.
PCM-T connector connected.

Connect a 5 amp fused jumper wire between the following:

Point A Reductant Heater and Sender Assembly Connector, Harness Side	Point B Reductant Heater and Sender Assembly Connector, Harness Side
RDL1 - Pin 6	RDLRTN - Pin 5
RDL2 - Pin 7	RDLRTN - Pin 5
RDL3 - Pin 8	RDLRTN - Pin 5

Ignition ON, engine OFF.
Access the PCM and monitor the REDUCT_LITERS (CAP) PID.

Is the capacity greater than 18 L?

Yes	No
INSTALL a new Reductant Heater and Sender assembly. REFER to the appropriate Engine Emission Control article. Clear the PCM DTCs. REPEAT the self-test.	GO to RJ6.

RJ6 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.