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DTC P0102 [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513)

BME010200100202

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 88 is below 0.24 V, PCM determines that MAF circuit has a 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 not available.
• 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 88 • Open circuit in wiring between MAF/IAT sensor terminal E and PCM terminal 88 • Open circuit in wiring between main relay and MAF/IAT sensor terminal B

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 SERVICE INFORMATION AVAILABILITY • Check for related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to available Service Information. • If 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 the WDS or equivalent to the DLC-2. • Start the 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 MAF SENSOR CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the MAF/IAT sensor connector. • Inspect for poor connection (such as damaged/pulled-out terminals, corrosion). • Is there any malfunction? | Yes | Repair or replace the terminals, then go to Step 9.
No | Go to the next step.
5 | CHECK POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch to the ON position (Engine off). • Measure the voltage at MAF/IAT sensor terminal B (wiring harness-side). • Is the voltage B+? | Yes | Go to the next step.
No | Inspect for open circuit in the wiring harness between MAF/IAT sensor terminal B (wiring harness-side) and main relay. Repair or replace the wiring harness, then go to Step 9.
6 | INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out terminals, corrosion). • Is there any malfunction? | Yes | Repair the terminal, then go to Step 9.
No | Go to the next step.
7 | INSPECT MAF SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT • Disconnect PCM connector. • Inspect for continuity between MAF/IAT sensor terminal E (wiring harness-side) and PCM terminal 88 (wiring harness-side). • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to Step 9.
8 | INSPECT MAF SENSOR SIGNAL CIRCUIT FOR SHORTS • Inspect for continuity between following circuits:

  - MAF/IAT sensor terminal E (wiring harness-side) and body ground
  - MAF/IAT sensor connector terminal D (wiring harness-side) and E (wiring harness-side)

• Is there continuity?
Yes
Repair or replace the wiring harness, then go to the next step.
No | Replace the MAF/IAT sensor, then go to the next step.
9 | VERIFY TROUBLESHOOTING OF DTC P0102 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine. • Access MAF PID.

  Note

  • MAF PID should indicate within 0.83- 236 g/s {0.11- 31.2 lb/min.}.

• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [AJ].) • Is there any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513).)
No | Troubleshooting completed.