DTC P0103 [L8, LF]

id0102b1803300

DTC P0103 | MAF sensor circuit high input
--- | ---
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. • FREEZE FRAME DATA (Mode 2/Mode 12) is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE | • MAF/IAT sensor connector or terminals malfunction • PCM connector or terminals 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 PCM terminal 1P • MAF sensor malfunction • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | VERIFY FREEZE FRAME DATA (MODE 12) HAS BEEN RECORDED • Has the FREEZE FRAME DATA (Mode 12) been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA (Mode 12) on the repair order, then go to the next step.
2 | VERIFY RELATED SERVICE 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/IAT SENSOR CONNECTOR AND TERMINALS • 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 connector or terminals, then go to Step 8.
No | Go to the next step.
4 | INSPECT PCM CONNECTOR AND TERMINALS • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair or replace the connector or terminals, then go to Step 8.
No | Go to the next step.
5 | INSPECT MAF SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • PCM connector is disconnected. • Disconnect the MAF/IAT sensor connector. • 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 there any voltage? | Yes | Repair or replace the wiring harness for a short to power supply, then go to Step 8.
No | Go to the next step.
6 | INSPECT MAF SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT • MAF/IAT sensor and PCM connectors are disconnected. • Turn the ignition switch off. • Inspect for continuity between MAF/IAT sensor terminal B (wiring harness-side) and body ground. • Is there continuity? | Yes | Repair or replace the wiring harness for a short to ground, then go to Step 8.
No | Go to the next step.
7 | INSPECT MAF SENSOR • Reconnect the MAF/IAT sensor connector. • Inspect the MAF sensor. (See MASS AIR FLOW (MAF) SENSOR INSPECTION [L8, LF].) • Is there any malfunction? | Yes | Replace the MAF/IAT sensor, then go to the next step. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
8 | VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all the disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [L8, LF].) • Start the engine and warm it up completely. • Perform the KOEO/KOER self test. (See KOEO/KOER SELF TEST [L8, LF].) • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
9 | VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L8, LF].) • Are any DTCs present? | Yes | Go to the applicable DTC troubleshooting. (See DTC TABLE [L8, LF].)
No | DTC troubleshooting completed.