NOTE: Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart.
Resistance Inspection
1. Disconnect the mass air flow sensor connector.
Standard
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Click for full-size image
2. Verify that the resistance between MAF sensor terminals D and E is within the specification.
- If the monitor item status/specification (reference) is not within the specification, even though the IAT sensor resistance is within the specification, perform the "Circuit Open/Short Inspection".
- If not within the specification, replace the MAF sensor.
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Circuit Open/Short Inspection
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1. Disconnect the PCM connector.
2. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- MAF/IAT sensor terminal D and PCM terminal 1AT*1*2, 1AH*3
- MAF/IAT sensor terminal E and PCM terminal 1AS*1, 1AV*2, 1AA*3
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- MAF/IAT sensor terminal E and power supply
- MAF/IAT sensor terminal D and power supply
- MAF/IAT sensor terminal D and body ground
*1 : California emission regulation applicable model
*2 : Except for California emission regulation applicable model with LF MTX, L3
*3 : Except for California emission regulation applicable model with LF ATX