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DTC Troubleshooting

P0101 DIAGNOSIS PROCEDURE

Step Action YES NO
1  Was "Engine and Emission Control System Check" performed?  Go to Step 2. Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK:J24B .
2  DTC check 
  1. Check DTC.

Is there DTC(s) other than P0101? 		 Go to applicable DTC (s). Go to Step 3.
3  Exhaust system and air intake system check 
  1. Check exhaust system and air intake system for clogging or leak.

Are they in good condition? 		 Go to Step 4. Repair or replace defective part.
4  MAF sensor power supply circuit check 
  1. Turn OFF ignition switch and disconnect connector from MAF and IAT sensor.
  2. Check for proper terminal connection to MAF and IAT sensor connector.
  3. If connections are OK, turn ignition switch to ON position.
  4. Check that voltage between MAF sensor power supply circuit (A1) and vehicle body ground is battery voltage.

Is it in good condition? 		 Go to Step 5. Repair or replace defective wire harness.
5  MAF sensor ground circuit check 
  1. Check that voltage between MAF sensor power supply circuit (A1) and MAF sensor ground circuit (A3) is battery voltage.

Is it in good condition? 		 Go to Step 6. Repair or replace defective wire harness.
6  MAF sensor signal circuit check 
  1. Turn OFF ignition switch and disconnect connectors from ECM.
  2. Check for proper terminal connection to ECM connectors.
  3. If connections are OK, check that MAF sensor signal circuit (A2) is as follows.
    • Wiring harness resistance of MAF sensor signal circuit is less than 3 Ω.
    • Insulation resistance between MAF sensor signal circuit and vehicle body ground is infinity.
    • Insulation resistance of wire harness is infinity between MAF sensor signal circuit terminal and other terminal at MAF and IAT sensor connector.
    • Circuit voltage of MAF sensor signal circuit is 0 - 1 V with ignition switch in ON position.

Is it in good condition? 		 Go to Step 7. Repair or replace defective wire harness.
7  MAF sensor check 
  1. Check MAF sensor, see MAF (MASS AIR FLOW) AND IAT (INTAKE AIR TEMPERATURE) SENSOR INSPECTION .

Is it in good condition? 		 Go to Step 8. Replace MAF and IAT sensor.
8  Throttle body assembly check 
  1. Check throttle body for performance, see THROTTLE BODY ASSEMBLY ON-VEHICLE INSPECTION .

Is it in good condition? 		 Substitute a known-good ECM and recheck. Replace throttle body assembly.
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