Protege LX L4-1.6L DOHC (2000)
Intake Air Temperature Sensor: Testing and Inspection
NOTE: Perform the following test only when directed.
IAT Sensor Resistance Inspection
1. Disconnect the MAF sensor connector.
Specification
2. Measure the resistance between MAF sensor terminals D and E using an ohmmeter.
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If not as specified, replace the MAF sensor.
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If IAT sensor is okay, but PID value or PCM terminal 39 voltage are out of specification, carry out the "Circuit Open/Short Inspection".
Circuit Open/Short Inspection
1. Remove the PCM.
2. Connect the 551 (104 Pin Breakout Box) to the PCM as shown.
3. Tighten the connector attaching screw.
Tightening torque:
7.9 - 10.7 N.m {80 - 110 kgf.cm, 69.5 - 95.4 in.lbf}
4. Inspect for an open or short circuit in the following wiring harnesses by probing the applicable sensor and SST (104 Pin Breakout Box) terminals
with ohmmeter leads.
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If there is an open or short circuit, repair or replace wiring harnesses.
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If there is no open or short circuit, replace the MAF sensor.
Open circuit
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IAT signal circuit (MAF sensor connector terminal D and PCM connector terminal 39)
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GND circuit (MAF sensor connector terminal E and PCM connector terminal 91 through common connector)
Short circuit
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IAT signal circuit (MAF sensor connector terminal D and PCM connector terminal 39 to GND)
5. Reconnect the sensor connector.