DTC P0102 [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed))

BME010200100W10

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 11 is below 0.24 V, PCM determines that MAF circuit has a malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.
• PENDING CODE is available if the 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 E and PCM terminal 11
• Open circuit in wiring between MAF/IAT sensor terminal E and PCM terminal 11
• Open circuit in wiring between main relay and MAF/IAT sensor terminal B
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME DATA on repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Check for related Service Information and/or on-line repair information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
VERIFY CURRENT INPUT SIGNAL STATUS-IS CONCERN INTERMITTENT OR CONSTANT
• Connect WDS or equivalent to DLC-2.
• Start engine.
• Access MAF PID.
• Is MAF PID within 0.83- 236 g/s {0.11 - 31.2 lb/min}?
Yes
Intermittent concern exists. Go to INTERMITTENT CONCERNS TROUBLESHOOTING procedure.
No
Go to the next step.
4
INSPECT POOR CONNECTION OF MAF SENSOR CONNECTOR
• Turn the ignition switch off.
• Disconnect the MAF/IAT sensor connector.
• Check for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace terminals, then go to Step 9.
No
Go to the next step.
5
CHECK POWER SUPPLY CIRCUIT FOR OPEN
• Turn the ignition switch to the ON position (Engine off).
• Check voltage at MAF/IAT sensor terminal B (harness-side).
• Is voltage B+?
Yes
Go to the 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 9.
6
INSPECT POOR CONNECTION OF PCM CONNECTOR
• Turn the ignition switch off.
• Disconnect PCM connector.
• Check for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair terminal, then go to Step 9.
No
Go to the next step.
7
INSPECT MAF SENSOR SIGNAL CIRCUIT FOR OPEN
• Connect the PCM connector.
• Check for continuity between MAF/IAT sensor terminal E (harness-side) and PCM terminal 11 (harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace suspected harness, then go to Step 9.
8
INSPECT MAF SENSOR SIGNAL CIRCUIT FOR SHORT CIRCUIT
• Check continuity between following circuits:
- MAF/IAT sensor terminal E (harness-side) and body ground
- MAF/IAT sensor connector terminal D (harness-side) and E (harness-side)
• Is there continuity?
Yes
Repair or replace suspected harness, then go to the next step.
No
Replace MAF/IAT sensor, then go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC P0102 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Start engine.
• Clear the DTC from the memory using the WDS or equivalent.
• Access MAF PID.
Note
• MAF PID should indicate within 0.83- 236 g/s {0.11 - 31.2 lb/min}.
• Is same DTC present?
Yes
Replace PCM, then go to the next step.
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.