DTC P0103 [L3 Turbo]
id0102b7803300
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DTC P0103 |
MAF circuit high input |
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DETECTION CONDITION
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• The PCM monitors input voltage from the MAF sensor when the engine is running. If the input voltage is above 4.9 V, the PCM determines that the MAF circuit has a malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA is available.
• DTCs are stored in the PCM memory.
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POSSIBLE CAUSE
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• Connector or terminal malfunction
• Short to power supply in the wiring harness between MAF/IAT sensor terminal C and PCM terminal 1AK
• Open circuit in the wiring harness between MAF/IAT sensor terminal B and PCM terminal 1P
• MAF sensor malfunction
• PCM malfunction
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has the FREEZE FRAME DATA been recorded?
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Yes
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Go to the next step.
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No
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Record FREEZE FRAME DATA on the repair order, then go to the next step.
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2
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VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Verify related Service Information availability.
• Is any related Service Information available?
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Yes
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Perform the repair or diagnosis according to the available Service Information.
• If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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3
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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 pins, corrosion).
• Is there any malfunction?
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Yes
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Repair or replace terminals, then go to Step 7.
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No
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Go to the next step.
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4
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INSPECT MAF SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
• Turn ignition switch to the ON position (Engine off).
• Measure voltage between MAF/IAT sensor terminal C (wiring harness-side) and body ground.
• Is voltage 0 V?
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Yes
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Go to the next step.
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No
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Repair or replace the suspected wiring harness, then go to Step 7.
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5
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INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
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Yes
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Repair the terminal, then go to Step 7.
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No
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Go to the next step.
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6
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INSPECT MAF SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
• Remove the PCM with the PCM connector connected.
• Inspect for continuity between MAF/IAT sensor terminal B (wiring harness-side) and PCM terminal 1P (wiring harness-side).
• Is there continuity?
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Yes
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Replace the MAF sensor, then go to the nest step.
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No
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Repair or replace the suspected wiring harness, then go to the next step.
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7
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VERIFY TROUBLESHOOTING OF DTC P0103 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Turn ignition switch to the ON position (Engine off).
• Clear the DTC from the PCM memory using the M-MDS.
• Start the engine and warm it up completely.
• Is same DTC present?
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Yes
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Replace the PCM, then go to the next step.
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No
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Go to the next step.
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8
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VERIFY AFTER REPAIR PROCEDURE
• Perform the “After Repair Procedure”.
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
(SeeDTC TABLE [L3 Turbo].)
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No
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Troubleshooting completed.
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