P0100 (blink 31, 3ZZ) on Toyota Corolla E120: MASS AIR FLOW CIRCUIT MALFUNCTION
Short answer: P0100 means “MASS AIR FLOW CIRCUIT MALFUNCTION”. The car’s computer has found a fault in the EFI 3ZZ-FE system and turns on the Malfunction indicator lamp (Check Engine). First check: workshop check order (RM821E): READ VALUE OF MAF/AFM -> INSPECT INTAKE AIR FLOW METER SUB−ASSY(POWER SOUCE VOLTAGE) -> INSPECT ECU -> CHECK HARNESS AND CONNECTOR(ENGINE ECU−AIR FLOW METER) -> CHECK HARNESS AND CONNECTOR(AIR FLOW METER +B CIRCUIT) -> INSPECT INTAKE AIR FLOW METER SUB−ASSY(POWER SOURCE VOLTAGE).
- Code
- P0100 · blink 31
- System
- EFI 3ZZ-FE
- Dashboard light
- Malfunction indicator lamp (Check Engine)
- Applies to
- 3ZZ-FE 1.6 (PK SE Saloon 1.6 2002-05 ZZE121)
- Confidence
- high (official Toyota RM821E)
- Source
- toyotamanuals.gitlab.io
Symptoms and when it is set
- Open or short in air flow meter circuit with more than 3 sec. engine speed less than 4,000 rpm
Likely causes
- Open or short in air flow meter circuit; Air flow meter; Engine ECU
What to check, in order
- Workshop check order (RM821E): READ VALUE OF MAF/AFM -> INSPECT INTAKE AIR FLOW METER SUB−ASSY(POWER SOUCE VOLTAGE) -> INSPECT ECU -> CHECK HARNESS AND CONNECTOR(ENGINE ECU−AIR FLOW METER) -> CHECK HARNESS AND CONNECTOR(AIR FLOW METER +B CIRCUIT) -> INSPECT INTAKE AIR FLOW METER SUB−ASSY(POWER SOURCE VOLTAGE)
Related on this car
- Dirty MAF sensor
- All fault codes for this car
- Warning lights
- Where the parts are (parts map)
- Common problems
Same code on other cars
- P0100 · Toyota Corolla (11th gen, E170)
- P0100 · Toyota Corolla (10th gen, E140)
- P0100 · Honda City (5th gen, GM2)
- P0100 · Honda Civic (10th gen, FC)
- P0100 · Suzuki Wagon R (Pakistan, K10B)
- P0100 on all cars compared
Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.