Test Procedure

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2004 Ford RV Cutaway, 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, and 2004 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.

H1 PRELIMINARY DIAGNOSIS FOR DTCs P0107, P0108

Perform the visual inspection.
Connect the scan tool.
Retrieve and record all DTCs.
Record freeze frame data.
Clear all DTCs.
Perform the KOEO On-Demand Self Test.

ARE DTCS P0107 OR P0108 PRESENT?

Yes	No
For P0107, Go to H2. For P0108, Go to H6.	UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. REFER to SYMPTOM CHARTS - 6.0L DIESEL if a driveability concern exists.

H2 DIAGNOSTIC TROUBLE CODE (DTC) P0107

NOTE: Refer to the PCM and component connector pin numbers, Figure and Figure, at the beginning of this pinpoint test.

Possible causes:
- signal circuit short to ground
- VREF circuit open
- BARO sensor
- PCM
Key off.
Disconnect BARO sensor electrical connector.
Key on.
Measure voltage between VREF and SIG RTN circuits at the BARO connector pin 2 and pin 1.

IS THE VREF VOLTAGE BETWEEN 4.5 AND 5.5 VOLTS?

Yes	No
Go to H3.	Go to PINPOINT TEST B to diagnose VREF and SIG RETURN.

H3 INDUCE OPPOSITE DTC

Key off.
Install a jumper wire between BARO sensor electrical connector pin 2 and pin 3.
Key on.
Perform the KOEO On-Demand Self Test.

IS DTC P0108 PRESENT?

Yes	No
INSTALL a new BARO sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.	Go to H4.

H4 CHECK SIGNAL CIRCUIT FOR A SHORT TO GROUND

Key off.
Disconnect the PCM body harness electrical connector.
Measure the resistance between BARO sensor connector pin 3 and ground.

IS THE RESISTANCE GREATER THAN 10,000 OHMS?

Yes	No
Go to H5.	REPAIR short to ground in signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

H5 CHECK SIGNAL CIRCUIT FOR AN OPEN

Measure resistance between BARO sensor electrical connector pin 3 and PCM body harness connector pin 38.

IS THE RESISTANCE LESS THAN 5 OHMS?

Yes	No
INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system.	REPAIR open in signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

H6 DIAGNOSTIC TROUBLE CODE (DTC) P0108

NOTE: Refer to the PCM and component connector pin numbers, Figure and Figure, at the beginning of this pinpoint test.

Possible causes:
- circuit short to voltage
- open in signal return circuit
- BARO sensor
- PCM
Key off.
Induce the opposite DTC.
Disconnect the BARO sensor.
Key on.
Perform On-Demand Self Test.

IS DTC P0107 PRESENT?

Yes	No
INSTALL a new BARO sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.	Go to H7.

H7 CHECK SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Key off.
Disconnect the PCM body harness electrical connector.
Key on.
Measure the voltage between BARO sensor connector pin 3 and ground.

IS THE VOLTAGE GREATER THAN 0.2 VOLTS?

Yes	No
REPAIR short to voltage in the BARO sensor signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.	Go to H8.

H8 CHECK SIGNAL RETURN CIRCUIT FOR AN OPEN

Key off.
Measure the resistance between the BARO sensor connector pin 1 and PCM body harness connector pin 33.

IS THE RESISTANCE LESS THAN 5 OHMS?

Yes	No
INSTALL a new PCM sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.	REPAIR open in the signal return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.