DTC P0104 [AJ (3.0L Duratec)]


id0102a4816900

DTC P0104

Mass air flow circuit intermittent/erratic

DETECTION CONDITION

• A fault exists in the MAF circuit, or air tube containing the sensor, causing incorrect air flow reading.

POSSIBLE CAUSE

• Air leak between MAF sensor and throttle body.
• MAF sensor malfunction
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to next step.
No
Record FREEZE FRAME DATA on repair order, then go to next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to next step.
No
Go to next step.
3
VERIFY RELATED PENDING CODE OR STORED DTC
• Verify the related PENDING CODE or stored DTCs.
• Are other DTCs present?
Yes
Go to appropriate DTC inspection.
No
Go to next step.
4
INSPECT AIR SUCTIONING BETWEEN MAF SENSOR AND TP SENSOR
• Inspect for major leaks, cracks and openings between MAF sensor and throttle body.
• Is there any malfunction?
Yes
Repair or replace the malfunctioning part, then go to Step 6.
No
Go to next step.
5
INSPECT MAF SENSOR
• Inspect the MAF sensor.
• Is there any malfunction?
Yes
Replace the MAF sensor, then go to next step.
No
Go to next step.
6
VERIFY TROUBLESHOOTING OF DTC P0104 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from memory using WDS or equivalent.
• Start engine.
• Perform "KOEO/KOER self-test"
• Is same DTC present?
Yes
Replace PCM, then go to next step.
No
Go to next step.
7
VERIFY AFTER SERVICE PROCEDURE
• Perform "AFTER SERVICE PROCEDURE".
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.