DTC P0101 [L3]


DTC P0101	MAF sensor inconsistent with TP sensor (lower than expected) or engine speed (greater than expected)
DETECTION CONDITION	• The PCM compares actual input signal from MAF sensor with expected input signal from MAF sensor (calculated by input voltage from throttle position sensor or engine speed). - If mass intake air flow amount is below 4.8 g/sec. {0.63 lb/min.} for 5 s and throttle opening angle is above 50% with engine running, the PCM determines that detected mass intake air flow amount is too low. - If mass intake air flow amount is above 66.5 g/sec. {8.8 lb/min.} for 5 s and engine speed is below 2,000 rpm with engine running, the PCM determines that detected mass intake air flow amount is too high. Diagnostic support note • This is a continuous monitor (CCM). • MIL illuminates if PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. • PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle. • FREEZE FRAME DATA is available. • DTC is stored in the PCM memory.
POSSIBLE CAUSE	• MAF sensor malfunction • TP sensor malfunction • Electrical corrosion in MAF signal circuit • Electrical corrosion in MAF RETURN circuit • Voltage drops in MAF signal circuit • Voltage drops in ground circuit


STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to next step.
1		No	Record FREEZE FRAME DATA on repair order, then go to next step.
2	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Check for related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to available Service Information. • If vehicle is not repaired, go to next step.
2		No	Go to next step.
3	VERIFY CURRENT INPUT SIGNAL STATUS-IS CONCERN INTERMITTENT OR CONSTANT • Connect WDS or equivalent to DLC-2. • Start the engine. • Access ECT, TP and MAF PIDs. • Warm up the engine until ECT PID is above 80 °C {176 °F}. • Drive the vehicle. • Read MAF PID while TP PID is above 50%. • Is MAF PID reading below 4.8 g/s {0.63 lb/min.}?	Yes	Make sure that throttle position sensor resistance changes smoothly while gradually opening throttle valve. • If not, replace throttle position sensor and go to Step 7. • For others, go to next step.
3		No	Go to next step.
4	VERIFY CURRENT INPUT SIGNAL STATUS-IS CONCERN INTERMITTENT OR CONSTANT • Connect WDS or equivalent to DLC-2. • Start the engine. • Access ECT, MAF and RPM PIDs. • Warm up engine until ECT PID is above 80°C {176 °F}. • Read MAF PID while RPM PID is below 2,000 rpm. • Is MAF PID reading above 66.5 g/s {8.8 lb/min.}?	Yes	Go to Step 8.
4		No	Intermittent concern exists. Go to INTERMITTENT CONCERNS TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [L3].)
5	INSPECT POOR CONNECTION OF MAF SENSOR CONNECTOR • Turn ignition key to OFF. • Disconnect MAF/IAT sensor connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction?	Yes	Repair or replace suspected terminal or MAF/IAT sensor, then go to Step 7.
5		No	Go to next step.
6	INSPECT POOR CONNECTION OF PCM CONNECTOR • Disconnect PCM connector. • Inspect for poor connection (damaged/pulled-out pins, corrosion, etc.). • Is there any malfunction?	Yes	Repair terminal, then go to next step.
6		No	Replace MAF/IAT sensor, then go to next step.
7	VERIFY TROUBLESHOOTING OF DTC P0101 COMPLETED • Make sure to reconnect all disconnected connectors. • Turn ignition key to ON (Engine OFF). • Clear DTC from memory using WDS or equivalent. • Start the engine. • Access ECT, TP and RPM PIDs. • Warm up the engine until ECT PID is reading above 80°C {176°F}. • Drive the vehicle while TP PID above 50% for 50 s. • Is same DTC present?	Yes	Replace PCM, then go to Step 11.
7		No	Go to Step 11.
8	CHECK MAF SENSOR TERMINALS FOR ELECTRICAL CORROSION • Turn ignition key to OFF. • Disconnect MAF/IAT sensor connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is any corrosion problem found?	Yes	Repair or replace suspected terminal or MAF/IAT sensor, then go to Step 10.
8		No	Go to next step.
9	INSPECT POOR CONNECTION OF PCM CONNECTOR • Disconnect PCM connector. • Inspect for poor connection (damaged, pulled-out pins, corrosion, etc.). • Is there any malfunction?	Yes	Repair terminal, then go to next step.
9		No	Go to next step.
10	VERIFY TROUBLESHOOTING OF DTC P0101 COMPLETED • Make sure to reconnect all disconnected connectors. • Turn ignition key to ON (Engine OFF). • Clear DTC from memory using WDS or equivalent. • Start the engine. • Warm up engine until ECT PID is above 80 °C {176 °F}. • Drive the vehicle while RPM PID is 2,000 rpm for 50 s. • Is PENDING CODE of same DTC present?	Yes	Replace PCM, then go to next step. (See PCM REMOVAL/INSTALLATION [L3].)
10		No	Go to next step.
11	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].)
11		No	Troubleshooting completed.