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.

UA1 CHECK THE AFCM SCP CIRCUITS

Key off.
Disconnect the AFCM C1404.
Measure the resistance between the AFCM C1404 pin 87, harness side and the DLC C251 pin 2, harness side.
Measure the resistance between the AFCM C1404 pin 88, harness side and the DLC C251 pin 10, harness side.

Are The Resistances Less Than 5 Ohms?

Yes	No
GO to UA2.	REPAIR the circuit in question.

UA2 CHECK THE PCM SCP CIRCUITS

Disconnect PCM C175.
Measure the resistance between the AFCM C1404 pin 87, harness side and the PCM C175 pin 16, harness side.
Measure the resistance between the AFCM C1404 pin 88, harness side and the PCM C175 pin 15, harness side.

Are The Resistances Less Than 5 Ohms?

Yes	No
GO to UA3.	REPAIR the circuit in question.

UA3 CHECK THE PCM CONFIGURATION

Reconnect the PCM C175.
Reconnect the AFCM C1404.
Check the PCM configuration. Refer to the base vehicle INTRODUCTION - CNG, FLEX-FUEL & GASOLINE .

Is The PCM Configured Correctly?

Yes	No
GO to UA4.	CALIBRATE the PCM or REPLACE if necessary.

UA4 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.