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

BME010200100W10

DTC P0102 | MAF circuit low input
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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
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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. (See INTERMITTENT CONCERN TROUBLESHOOTING [AJ].)
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". (See AFTER REPAIR PROCEDURE [AJ].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed)).)
No | Troubleshooting completed.