DTC P0103:00 [L8, LF, L5]

id010242701000

DTC P0103:00

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 is available.

•  The DTC 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 PCM terminal 1P

•  PCM malfunction

DTC P0103:00	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 is available. • The DTC 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 PCM terminal 1P • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
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.
1		No	Record the FREEZE FRAME 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.
2		No	Go to the next step.
3	INSPECT POOR CONNECTION OF MAF SENSOR CONNECTOR • Switch the ignition to off. • Disconnect the MAF/IAT connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, then go to Step 8.
3		No	Go to the next step.
4	INSPECT MAF SIGNAL CIRCUIT FOR SHORT TO POWER CIRCUIT • Switch the ignition to ON. (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 8.
4		No	Go to the next step.
5	INSPECT POOR CONNECTION OF PCM CONNECTOR • Switch the ignition to off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, then go to Step 8.
5		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 PCM terminal 1P (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
6		No	Repair or replace the wiring harness, then go to the next step.
7	INSPECT MAF SENSOR • Inspect the MAF sensor. (See MASS AIR FLOW (MAF) SENSOR INSPECTION [L8, LF, L5].) • Is there any malfunction?	Yes	Replace the MAF/IAT sensor, then go to the next step. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L8, LF, L5].)
7		No	Go to the next step.
8	VERIFY TROUBLESHOOTING OF DTC P0103:00 COMPLETED • Make sure to reconnect all the disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. • Start the engine. • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF, L5].)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L8, LF, L5].) • Are any DTCs present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE [L8, LF, L5].)
9		No	Troubleshooting completed.