Protege DX L4-2.0L DOHC (2002)
Idle Speed/Throttle Actuator - Electronic: Component Tests and General Diagnostics
IDLE AIR CONTROL (IAC) VALVE INSPECTION
Resistance Inspection
NOTE: Perform the following test only as directed.
1. Carry out the "Idle Air Control (IAC) Inspection".
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If not as specified, perform the further inspection for the IAC valve.
2. Disconnect the battery negative cable.
3. Disconnect the IAC valve connector.
4. Measure the resistance between the IAC valve terminals using an ohmmeter.
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If not as specified, replace the IAC valve.
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If as specified, but PID value failed, carry out the "Circuit Open/Short inspection".
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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 IAC valve.
Resistance: 7.7 - 9.3 Ohms [23 °C {73 °F}]
Circuit Open/Short Inspection
1. Disconnect the PCM connector.
2. Connect the SST (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.
Open circuit
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Power circuit (IAC valve connector terminal A and PCM connector terminal 54)
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GND circuit (IAC valve connector terminal B and PCM connector terminal 83)
Short circuit
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Power circuit (IAC valve connector terminal A and PCM connector terminal 54 to GND)
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GND circuit (IAC valve connector terminal B and PCM connector terminal 83 to GND)