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Home >> Lexus >> 1994 >> SC 300 L6-3.0L (2JZ-GE) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Idle Air Control Valve Circuit >> Inspection Procedure
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Inspection Procedure

INSPECTION PROCEDURE

1. Check Idle Air Control Valve.





- Disconnect Idle Air Control Valve connector.
- Measure resistance between terminals as shown.

Terminals 5 (B1) - 4 (S1), 5 (B1) - 6 (S3), 2 (B2) - 1 (52), 2 (B2) - 3 (S4); 10 ohms - 30 ohms

- Remove Idle Air Control Valve.
- Connect the battery positive lead to terminals 5 (B1) and 2 (82), and the negative lead to terminals 4(S1) - 1(S2) - 6(S3) - 3(S4) in that order. The valve moves in the closing direction.
- Connect the battery positive lead to terminals 5 (S1) and 2 (S2) and the negative lead to terminals 3(S4) - 6(S3) - 1(S2) - 4(S1) in that order. The valve moves in the opening direction.
- If OK proceed to step 2.
- If not OK replace Idle Air Control Valve.
2. Check for open and short in harness and connector between EFI Main Relay and Idle Air Control Valve, Idle Air Control Valve and Engine Control Module.
- If OK proceed to DIAGNOSIS BY SYMPTOM.
- If not OK repair or replace harness or connector.
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