Shutter Solenoid Valve Signal Check
- Warm engine to normal operating temperature. Stop engine. Connect tachometer to engine. Connect voltmeter to negative (Light Green/Yellow) terminal of shutter solenoid valve electrical connector without disconnecting connector.
- Disconnect throttle sensor electrical connector (Black/Yellow and Green/Black wires). Shift automatic transmission into "P" or "N". Start engine and run at idle.
- Voltmeter should read 0V at shutter solenoid valve terminals. Disconnect electrical connector from throttle sensor. Voltmeter should read near 12V and engine idle is erratic.
- Shift automatic transmission into "D". Connect throttle sensor connector disconnected in step 1). Voltmeter should read near 12V.
- On automatic transmissions, shift into "P" or "N". Current should NOT flow to solenoid valve terminal at any engine speed. If solenoid valve does not respond as described, replace shutter solenoid valve.
NOTE:
Before replacing shutter solenoid valve, check auxiliary control unit as outlined in AUXILIARY CONTROL DEVICE article. Also check relief solenoid valve and switching solenoid valve as described in AIR INJECTION SYSTEM article.