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DTC P0101 [13B-MSP]

DTC REFERENCE CHART

DTC P0101 MAF sensor circuit range/performance problem
DETECTION CONDITION 
  • The PCM compares the actual MAF amount with the expected MAF amount when the engine is running.

  • If the throttle opening angle is more than 50%  and the MAF amount is less than 9 g/s {1.2 lb/min} (less than 1.4 V)  , the PCM determines that there is a MAF sensor circuit range/performance problem.
  • If the ECT is more than 70°C {158°F}  , the engine speed is less than 2,000 RPM  and the MAF amount is more than 65 g/s {8.6 lb/min} (more than 2.8 V)  , the PCM determines that there is a MAF sensor circuit range/performance problem.

Diagnostic support note 
  • This is a continuous monitor (CCM.)
  • The MIL illuminates if the 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 the PCM detects the above malfunction condition during the first drive cycle.
  • FREEZE FRAME DATA is available.
  • The DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • MAF sensor malfunction
  • Eccentric shaft position sensor malfunction
  • PCM malfunction
DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED 
  • Has FREEZE FRAME DATA been recorded?
 Yes Go to the next step.
No Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify related Service Bulletins and/or on-line repair information availability.
  • Is any related repair information available?
 Yes Perform repair or diagnosis according to the available repair information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
3 VERIFY CURRENT INPUT SIGNAL STATUS 
  • Connect the M-MDS to the DLC-2.
  • Start the engine.
  • Access the TP REL and MAF PIDs.
  • Read the MAF PID when the TP REL PID is more than 50 %  .
  • Is the MAF PID less than 9 g/s {1.2 lb/min}  ?
 Yes Verify that the TP REL PID changes smoothly while gradually opening throttle valve.
No Go to the next step.
4 VERIFY CURRENT INPUT SIGNAL STATUS 
  • Connect the M-MDS to the DLC-2.
  • Start the engine.
  • Access the ECT, RPM and MAF PIDs.
  • Warm-up the engine until the ECT PID is more than 70°C {158°F}  .
  • Read the MAF PID when the RPM PID is less than 2,000 RPM  .
  • Is the MAF PID more than 65 g/s {8.6 lb/min}  ?
 Yes Go to Step 6.
No Intermittent concern exists. Perform the "INTERMITTENT CONCERNS TROUBLESHOOTING". (See INTERMITTENT CONCERN TROUBLESHOOTING [13B-MSP] .)
5 VERIFY TROUBLESHOOTING OF DTC P0101 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the M-MDS.
  • Start the engine.
  • Access the TP REL PID.
  • Drive the vehicle for 5 s or more  when the TP REL PID is more than 50 %  .
  • Is the PENDING CODE same as the DTC present?
 Yes Replace the PCM, then go to Step 9. (See PCM REMOVAL/INSTALLATION [13B-MSP] .)
No Go to Step 9.
6 INSPECT MAF SENSOR 
 Yes Replace the MAF/IAT sensor, then go to Step 8. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [13B-MSP] .)
No Go to the next step.
7 INSPECT ECCENTRIC SHAFT POSITION SENSOR 
 Yes Replace the eccentric shaft position sensor, then go to the next step. (See ECCENTRIC SHAFT POSITION SENSOR REMOVAL/INSTALLATION [13B-MSP] .)
No Go to the next step.
8 VERIFY TROUBLESHOOTING OF DTC P0101 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the M-MDS.
  • Start the engine.
  • Access the ECT and RPM PIDs.
  • Warm-up the engine until the ECT PID is more than 70°C {158°F}  .
  • Drive the vehicle for 5 s or more  when the RPM PID is less than 2,000 RPM  .
  • Is the PENDING CODE same as the DTC present?
 Yes Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [13B-MSP] .)
No Go to the next step.
9 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection. (See DTC TABLE [13B-MSP] .)
No DTC troubleshooting completed.
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