Test Procedure

WARNING: This page is about a different car, the 2004 Ford Pickup Heritage. However, it is still accessible from the selected car via links, so may be relevant.

DA1 MONITOR THE FRTMPAB PID

Connect the scan tool.
Key on, engine off.
Access the AFCM
Select the FRTMPAB PID.
Refer to the FUEL RAIL TEMPERATURE SENSOR VOLTAGE AND RESISTANCE SPECIFICATIONS table at the beginning of this Pinpoint Test for temperature specifications.

Is The Fuel Rail Temperature Within The Normal Operating Range?

Yes	No
CLEAR the DTCs. ROAD TEST the vehicle. REPEAT the self-test. For DTC P0182, GO to DA2. For DTC P0183, GO to DA4.	For DTC P0182, GO to DA2. For DTC P0183, GO to DA4.

DA2 SIMULATE AN OPPOSITE FRT SENSOR SIGNAL

Key off.
Disconnect the FRT sensor C1257.
Key on, engine off.
Monitor the FRTMPAB PID.

Is The FRTMPAB PID Less Than -30 °C (-22 °F)?

Yes	No
INSTALL a new FRT sensor.	GO to DA3.

DA3 CHECK THE FRT SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Key off.
Disconnect the AFCM C1404.
Measure the resistance between the FRT sensor C1257 signal circuit, harness side and ground.
Measure the resistance between the FRT sensor C1257 signal circuit, harness side and the FRT sensor C1257 SIG RTN circuit, harness side.

Are The Resistances Greater Than 10,000 Ohms?

Yes	No
GO to DA7.	REPAIR the circuit in question.

DA4 SIMULATE AN OPPOSITE SENSOR SIGNAL

Key off.
Disconnect the FRT sensor C1257.
Key on, engine off.
Monitor the FRTMPAB PID.
Connect a 5-amp fused jumper wire between the FRT sensor C1257 signal circuit, harness side and the FRT sensor C1257 SIG RTN circuit, harness side.

Is The FRTMPAB PID Greater Than 120°C (248 °F)?

Yes	No
INSTALL a new FRT sensor.	GO to DA5.

DA5 CHECK THE FRT SENSOR SIGNAL AND SIG RTN CIRCUITS FOR AN OPEN

Key off.
Disconnect the AFCM C1404.
Measure the resistance between the FRT sensor C1257 signal circuit, harness side and the AFCM C1404 pin 31, harness side.
Measure the resistance between the FRT sensor C1257 SIG RTN circuit, harness side and the AFCM C1404 pin 89, harness side.

Are The Resistances Less Than 5 Ohms?

Yes	No
GO to DA6.	REPAIR the circuit in question.

DA6 CHECK THE FRT SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Key on, engine off.
Measure the voltage between the FRT sensor C1257 signal circuit, harness side and ground.

Is Any Voltage Indicated?

Yes	No
REPAIR the circuit.	GO to DA7.

DA7 CHECK FOR CORRECT AFCM OPERATION

Disconnect the AFCM.
Check for:
- corrosion
- pushed out pins
Connect the AFCM connector and make sure it is seated correctly.
Operate the system and verify the concern is still present.

Is The Concern Still Present?

Yes	No
INSTALL a new AFCM.	The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.