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.

J1 PRELIMINARY DIAGNOSIS FOR DTCs P0101, P0103, P1102

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.
Perform the KOER On-Demand Self-Test.

ARE DTCS P0101, P0103 OR P1102 PRESENT?

Yes	No
For P0101, Go to J2. For P1102, Go to J4. For P0103, Go to J8.	Unable to duplicate condition. CHECK for restriction in air flow and water intrusion. CHECK for loose connection, damaged or corroded terminals or pins. WIGGLE harness attempting to recreate the fault. REFER to SYMPTOM CHARTS - 6.0L DIESEL if driveability concern exists.

J2 DIAGNOSTIC TROUBLE CODE (DTC) P0101

Possible causes:
- MAF sensor
- contaminated sensor
- unmetered air flow into engine
- PCM
Check MAF sensor for contamination.

IS ANY RESTRICTION OR CONTAMINATION PRESENT?

Yes	No
REMOVE restriction and REPAIR system as necessary. CLEAR DTCs and RETEST the system.	Go to J3.

J3 CHECK MAF OUTPUT SIGNAL TO PCM

Access MAF PIDs.
Engine running.
Monitor MAF PID volts at idle.
Increase idle to approximately 2,500 rpm while monitoring PID.

IS MAF PID VALUE 1.4 TO 1.8 VOLTS WITH ENGINE IDLING AND 1.9 TO 2.1 VOLTS AT 2,500 RPM?

Yes	No
INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system.	INSTALL a new MAF sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

J4 DIAGNOSTIC TROUBLE CODE (DTC) P1102

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

Possible causes:
- restricted air flow
- MAF sensor disconnected
- VPWR circuit open to MAF
- PWR GND circuit open to MAF
- MAF RTN signal open
- MAF signal shorted to ground
- mechanical failure
- MAF sensor
- PCM
Inspect air intake for restrictions
Key off.
Disconnect the MAF sensor harness connector.
Key on.
Measure the voltage between the MAF sensor VPWR circuit pin 2, harness side and MAF PWR GND pin 3, harness side.
Measure the voltage between the MAF sensor VREF circuit pin 4, harness side and MAF PWR GND pin 3, harness side.

IS THE VOLTAGE GREATER THAN 10.5 VOLTS BETWEEN PINS 2 AND 3 AND IS THE VOLTAGE APPROXIMATELY 5.5 TO 6.5 VOLTS BETWEEN PINS 4 AND 3?

Yes	No
Go to J5.	REPAIR the circuit in question. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

J5 CHECK MAF SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Key off.
Disconnect the PCM body harness electrical connector.
Measure the resistance between MAF sensor harness connector signal circuit pin 5 and ground.

IS THE RESISTANCE GREATER THAN 10,000 OHMS?

Yes	No
Go to J6.	REPAIR short to ground in signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

J6 CHECK MAF SENSOR SIGNAL CIRCUIT FOR AN OPEN

Measure the resistance between MAF sensor harness connector signal circuit pin 5 and PCM body harness connector pin 42.

IS THE RESISTANCE LESS THAN 5 OHMS?

Yes	No
Go to J7.	REPAIR open in signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

J7 CHECK MAF SENSOR CIRCUITS

NOTE: This step may cause DTC P0103 to set.

Reconnect the PCM body harness electrical connector.
Key on, engine off.
Access MAF VOLT PID.
Record MAF VOLT PID reading.
Install a jumper wire between the MAF signal circuit pin 5 and the MAF VPWR circuit pin 2.

DOES THE MAF PID CHANGE FROM LESS THAN 0.04 VOLT TO GREATER THAN 4.5 VOLTS?

Yes	No
INSTALL a new MAF sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.	INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

J8 DIAGNOSTIC TROUBLE CODE (DTC) P0103

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

Possible causes:
- restricted inlet air flow
- water intrusion
- MAF signal circuit shorted to power
- open ground circuit
- MAF sensor
- PCM
Disconnect air inlet and check for restrictions and water intrusion.

IS A CONCERN PRESENT?

Yes	No
REPAIR as necessary. RESTORE the vehicle. CLEAR DTCs and RETEST the system.	Go to J9.

J9 INDUCE OPPOSITE FAILURE

Disconnect the MAF sensor electrical connector.
Perform the KOER On-Demand Self-Test.

IS DTC P0102 PRESENT?

Yes	No
RESTORE the vehicle. CLEAR DTCs. Go to J12.	Go to J10.

J10 CHECK MAF SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Disconnect the PCM body harness electrical connector.
Measure the voltage between MAF sensor signal circuit pin 5 and ground.

IS THE VOLTAGE LESS THAN 0.2 VOLT?

Yes	No
Go to J11.	REPAIR short to voltage in signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

J11 CHECK MAF RETURN CIRCUITS FOR AN OPEN

Key off.
Measure the resistance between MAF sensor harness connector signal return circuit pin 1 and PCM body harness connector pin 33; and between the MAF sensor harness connector pin 4 and PCM body harness connector pin 21.

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 return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

J12 CHECK THE MAF SIGNAL TO THE PCM

Access the MAF PID.
Key on, engine running.
Monitor and record the MAF PID voltage at idle.
Increase the engine speed to 2,500 RPM.
Record the MAF PID voltage.

IS THE MAF PID VOLTAGE BETWEEN 1.4 TO 1.8 VOLTS AT IDLE AND 1.9 TO 2.1 VOLTS AT 2,500 RPM?

Yes	No
UNABLE to duplicate condition. Concern may have set due to water intrusion. REFER to SYMPTOM CHARTS - 6.0L DIESEL if a driveability concern exists.	INSTALL a new MAF sensor. RESTORE the vehicle. CLEAR the DTCs and RETEST the system.