DTC P0103 [MZR-CD (RF Turbo)]

BME010200100W23

DTC P0103

MAF sensor circuit high input

DETECTION CONDITION

• PCM monitors input voltage from MAF sensor while engine is running. If input voltage from MAF sensor is above 4.9 V, PCM determines MAF sensor circuit high input.

POSSIBLE CAUSE

• MAF sensor malfunction
• Connector or terminal malfunction
• Short to power circuit in wiring between MAF/IAT sensor terminal C and PCM terminal 9
• MAF sensor power and signal circuits short each other
• Open circuit in wiring between MAF/IAT sensor terminal B and PCM terminal 14
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform "DTC Confirmation Procedure".
• Is same DTC present during KOEO or KOER self-test?
Yes
Go to next step.
No
Intermittent concern exists. Go to "Intermittent Concern Troubleshooting".
2
INSPECT POOR CONNECTION OF MAF SENSOR CONNECTOR
• Turn engine switch to OFF.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace suspected terminal, go to Step 8.
No
Go to next step.
3
INSPECT MAF SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER
• Turn engine switch to ON. (Engine OFF)
• Inspect voltage between MAF/IAT sensor terminal C and body GND.
• Is voltage below 1.0 V?
Yes
Go to next step.
No
Repair or replace harness for short to power, go to Step 8.
4
INSPECT MAF SENSOR CIRCUIT FOR SHORT WITH EACH OTHER
• Turn engine switch to OFF.
• Inspect continuity between MAF/IAT sensor terminals A and C.
• Is there continuity?
Yes
Repair or replace harness for short with each other, go to Step 8.
No
Go to next step.
5
INSPECT MAF SENSOR
• Inspect MAF sensor.
• Is there any malfunction?
Yes
Replace MAF/IAT sensor, go to Step 8.
No
Go to next step.
6
INSPECT POOR CONNECTION OF PCM CONNECTOR
• Turn engine switch to OFF.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace suspected terminal, go to Step 8.
No
Go to next step.
7
INSPECT MAF SENSOR GND CIRCUIT FOR OPEN
• Turn engine switch to OFF.
• Inspect continuity between MAF/IAT sensor terminal B and PCM terminal 14.
• Is there continuity?
Yes
Go to next step.
No
Repair or replace harness for open, go to next step.
8
VERIFY TROUBLESHOOTING OF DTC P0103 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from PCM memory using WDS or equivalent.
• Perform KOEO/KOER self-test.
• Is same DTC present?
Yes
Replace PCM, go to next step.
No
Go to next step.
9
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.