DTC P0103-00; MAF Sensor Circuit High Input: Notes

DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0103:00	MAF sensor circuit high input
DETECTION CONDITION	The PCM monitors the input voltage from the MAF sensor. If the input voltage at the PCM terminal 2BC is above 4.94 V for 5 s, the PCM determines that the MAF sensor circuit has a malfunction. Diagnostic support note This is a continuous monitor (CCM). The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA/Snapshot data is available. DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Restricts the upper limit of the engine speed. Inhibits the evaporative purge control.
POSSIBLE CAUSE	MAF sensor/IAT sensor No. 1 connector or terminals malfunction PCM connector or terminals malfunction MAF sensor malfunction Short to power supply in wiring harness between MAF sensor/IAT sensor No. 1 terminal C and PCM terminal 2BC Open circuit in wiring harness between MAF sensor/IAT sensor No. 1 terminal B and PCM terminal 2AY PCM malfunction

CAUTION:

• Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.

Related PIDs

Item (definition)	Unit/Condition	Definition	Condition/Specification (Reference)
MAF	g/Sec	Mass air flow input from MAF sensor	Displays MAF
	V	MAF sensor voltage	Ignition switched ON (engine off) (MAF: 0.59 g/s {0.078 lb/min}): Approx. 0.72 V Idle (after warm up) (MAF: 2.17 g/s {0.287 lb/min}): Approx. 0.97 V Racing (engine speed is 2, 000 rpm) (MAF: 4.73 g/s {0.626 lb/min}): Approx. 1.26 V