DTC P0103 [L3]

BME010200100225

DTC P0103

MAF circuit high input

DETECTION CONDITION

• The PCM monitors input voltage from the MAF sensor when the engine is running. If input voltage at PCM terminal 1P is above 4.9 V, the PCM determines that the MAF circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if PCM detects the above malfunction condition during first drive cycle.
• PENDING CODE is available if PCM detects the above malfunction condition.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• MAF sensor malfunction
• Connector or terminal malfunction
• Short to power in wiring between MAF/IAT sensor terminal C and PCM terminal 1P
• Open circuit in MAF/IAT sensor ground circuit

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
• Is the same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure.
2
INSPECT POOR CONNECTION OF MAF SENSOR CONNECTOR
• Turn the ignition switch off.
• Disconnect the MAF/IAT sensor connector.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace the terminals, then go to Step 6.
No
Go to the next step.
3
INSPECT MAF SIGNAL CIRCUIT FOR SHORT TO POWER CIRCUIT
• Turn the ignition switch to the ON position (Engine off).
• Measure the voltage between MAF/IAT sensor terminal C (wiring harness-side) and body ground.
• Is the voltage 0 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness, then go to Step 6.
4
INSPECT POOR CONNECTION OF PCM CONNECTOR
• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair the terminal, then go to Step 6.
No
Go to the next step.
5
INSPECT MAF SENSOR GROUND CIRCUIT FOR OPEN
• Remove the PCM with the PCM connector connected.
• Inspect for continuity between MAF/IAT sensor terminal B (wiring harness-side) and GND.
• Is there continuity?
Yes
Replace the MAF/IAT sensor, then go to the next step.
No
Repair or replace the wiring harness, then go to the next step.
6
VERIFY TROUBLESHOOTING OF DTC P0103 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Perform KOEO/KOER self-test.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
7
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.