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

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

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.
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".
• Is there any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.