DTC P0103 [L3]


DTC P0103	MAF circuit high input
DETECTION CONDITION	• PCM monitors input voltage from MAF sensor when engine is running. If input voltage at PCM terminal 1P is above 4.9 V, PCM determines that MAF circuit has 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 available if PCM detects the above malfunction condition. • FREEZE FRAME DATA is available. • DTC is stored in the PCM memory.
POSSIBLE CAUSE	• MAF sensor malfunction • Connector or terminal malfunction • Short to power in wiring between MAF/IAT sensor terminal C and PCM terminal 1P • Open circuit in MAF/IAT sensor ground circuit


STEP	INSPECTION		ACTION
1	PERFORM DTC CONFIRMATION PROCEDURE • Perform DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE [L3].) • Is same DTC present?	Yes	Go to next step.
1		No	Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [L3].)
2	INSPECT POOR CONNECTION OF MAF SENSOR CONNECTOR • Turn ignition key to OFF. • Disconnect the MAF/IAT sensor connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction?	Yes	Repair or replace terminals, then go to Step 6.
2		No	Go to next step.
3	INSPECT MAF SIGNAL CIRCUIT FOR SHORT TO POWER CIRCUIT • Turn ignition key to ON (Engine OFF). • Measure voltage between MAF/IAT sensor terminal C (harness-side) and body ground. • Is voltage 0 V?	Yes	Go to next step.
3		No	Repair or replace suspected harness, then go to Step 6.
4	INSPECT POOR CONNECTION OF PCM CONNECTOR • Turn ignition key to OFF. • Disconnect PCM connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction?	Yes	Repair terminal, then go to Step 6.
4		No	Go to next step.
5	INSPECT MAF SENSOR GROUND CIRCUIT FOR OPEN • Remove PCM with PCM connector connected. • Inspect for continuity between MAF/IAT sensor terminal B (harness-side) and GND. • Is there continuity?	Yes	Replace MAF/IAT sensor, then go to next step.
5		No	Repair or replace suspected harness, then go to next step.
6	VERIFY TROUBLESHOOTING OF DTC P0103 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear DTC from memory using WDS or equivalent. • Perform KOEO/KOER self-test. (See KOEO/KOER SELF-TEST PROCEDURE [L3].) • Is same DTC present?	Yes	Replace PCM, then go to next step. (See PCM REMOVAL/INSTALLATION [L3].)
6		No	Go to next step.
7	VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3].) • Is there any DTC present?	Yes	Go to applicable DTC troubleshooting. (See DTC TABLE [L3].)
7		No	Troubleshooting completed.