DTC P0102 [L3]

BME010200100W02

DTC P0102

MAF circuit low input

DETECTION CONDITION

• PCM monitors input voltage from MAF sensor when engine is running. If input voltage at PCM terminal 1P is below 0.21 V, PCM determines that 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 ground in wiring between MAF/IAT sensor terminal C and PCM terminal 1P
• Open circuit in wiring between MAF/IAT sensor terminal C and PCM terminal 1P
• Open circuit in wiring between main relay and MAF/IAT sensor terminal A

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
• Is same DTC present?
Yes
Go to next step.
No
Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure.
2
INSPECT POOR CONNECTION OF MAF SENSOR CONNECTOR
• Turn ignition key to 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 terminals, then go to Step 7.
No
Go to next step.
3
CHECK POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
• Turn ignition key to ON (Engine OFF).
• Inspect voltage at MAF/IAT sensor terminal B (harness-side).
• Is voltage B+?
Yes
Go to next step.
No
Inspect for open circuit in wiring harness between MAF/IAT sensor terminal B (harness-side) and main relay.
Repair or replace harness, then go to Step 7.
4
INSPECT POOR CONNECTION OF PCM CONNECTOR
• Turn ignition key to OFF.
• Disconnect PCM connector.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair terminal, then go to Step 7.
No
Go to next step.
5
INSPECT MAF SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT
• Remove PCM with PCM connector connected.
• Inspect for continuity between MAF/IAT sensor terminal C (harness-side) and PCM terminal 1P (harness-side).
• Is there continuity?
Yes
Go to next step.
No
Repair or replace suspected harness, then go to Step 7.
6
INSPECT MAF SENSOR SIGNAL CIRCUIT FOR SHORTS
• Inspect continuity between following circuits:
- MAF/IAT sensor terminal C (harness-side) and body ground
- MAF/IAT sensor connector terminal C (harness-side) and B (harness-side)
• Is there continuity?
Yes
Repair or replace suspected harness, then go to next step.
No
Replace MAF/IAT sensor, then go to next step.
7
VERIFY TROUBLESHOOTING OF DTC P0102 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from memory using WDS or equivalent.
• Perform KOEO/KOER self-test.
• Is same DTC present?
Yes
Replace PCM, then go to next step.
No
Go to next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC troubleshooting.
No
Troubleshooting completed.