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DTC P0103 [L8, LF, L3]

id0102a1803300

DTC P0103 | MAF sensor circuit high input
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DETECTION CONDITION | • The PCM monitors the input voltage from the MAF sensor when the engine 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). • The MIL illuminates if the PCM detects the above malfunction condition during first drive cycle. • PENDING CODE is available if the PCM detects the above malfunction condition. • FREEZE FRAME DATA is available. • Are any DTCs is stored in the PCM memory.
POSSIBLE CAUSE | • MAF sensor malfunction • Connector or terminal malfunction • Short to power supply in wiring harness between MAF/IAT sensor terminal C and PCM terminal 1AK • Open circuit in wiring harness between MAF/IAT sensor terminal B and ground • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to the available Service information. If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | 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? | Yes | Repair or replace the terminals, then go to Step 7.
No | Go to the next step.
4 | INSPECT MAF SIGNAL CIRCUIT FOR SHORT TO POWER CIRCUIT • Turn the ignition switch to the ON position. (Engine off) • Measure the voltage between MAF/IAT sensor terminal C (wiring harness-side) and body ground. • Is the voltage B+? | Yes | Repair or replace the wiring harness, then go to Step 7.
No | Go to the next step.
5 | 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? | Yes | Repair the terminal, then go to Step 7.
No | Go to the next step.
6 | INSPECT MAF SENSOR GROUND FOR OPEN CIRCUIT • Remove the PCM with the PCM connector connected. • Inspect for continuity between MAF/IAT sensor terminal B (wiring harness-side) and ground. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to the next step.
7 | VERIFY TROUBLESHOOTING OF DTC P0103 COMPLETED • Make sure to reconnect all the disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine. • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF, L3].)
No | Go to the next step.
8 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [L8, LF, L3].) • Are any DTCs present? | Yes | Go to the applicable DTC troubleshooting. (See DTC TABLE [L8, LF, L3].)
No | Troubleshooting completed.