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 the next step.
1		No	Record FREEZE FRAME DATA on repair order, then go to the 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 the next step.
2		No	Go to the next step.
3	VERIFY CURRENT INPUT SIGNAL STATUS-IS CONCERN INTERMITTENT OR CONSTANT • Connect the WDS or equivalent to the 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 the throttle position sensor and go to Step 7. • For others, go to the next step.
3		No	Go to the next step.
4	VERIFY CURRENT INPUT SIGNAL STATUS-IS CONCERN INTERMITTENT OR CONSTANT • Connect the WDS or equivalent to the 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 the ignition switch 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 the terminal or MAF/IAT sensor, then go to Step 7.
5		No	Go to the next step.
6	INSPECT POOR CONNECTION OF PCM CONNECTOR • Disconnect the PCM connector. • Inspect for poor connection (damaged/pulled-out pins, corrosion, etc.). • Is there any malfunction?	Yes	Repair the terminal, then go to the next step.
6		No	Replace the MAF/IAT sensor, then go to the next step.
7	VERIFY TROUBLESHOOTING OF DTC P0101 COMPLETED • Make sure to reconnect all disconnected connectors. • Turn the ignition switch to the ON position (Engine off). • Clear the DTC from the PCM memory using the 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 5 s. • Is the same DTC present?	Yes	Replace the PCM, then go to Step 11.
7		No	Go to Step 11.
8	CHECK MAF SENSOR TERMINALS FOR ELECTRICAL CORROSION • Turn the ignition switch off. • Disconnect the MAF/IAT sensor connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is any corrosion problem found?	Yes	Repair or replace the terminal or MAF/IAT sensor, then go to Step 10.
8		No	Go to the next step.
9	INSPECT POOR CONNECTION OF PCM CONNECTOR • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair the terminal, then go to the next step.
9		No	Go to the next step.
10	VERIFY TROUBLESHOOTING OF DTC P0101 COMPLETED • Make sure to reconnect all disconnected connectors. • Turn the ignition switch to the ON position (Engine off). • Clear the DTC from the PCM memory using the 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 5 s. • Is the PENDING CODE of the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L3].)
10		No	Go to the next step.
11	VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3].) • Is there any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [L3].)
11		No	Troubleshooting completed.