Vacuum Advance Control Solenoid: Testing and Inspection

Ignition Control Solenoid Valve Tests

Test I:
1. Start the engine and warm up the engine to normal operating temperature (the cooling fan comes on).





2. Disconnect the #5 vacuum hose from the intake manifold and check the vacuum.
- If there is no vacuum, check the vacuum port.
- If there is vacuum, check the vacuum line for proper connection, cracks, blockage or disconnected hose.
- If the vacuum line is OK, re-connect the #5 vacuum hose.
3. Disconnect the 6-P connector.





4. Attach the positive probe of the voltmeter to BLK/YEL terminal of the connector, and the negative probe to WHT terminal. Raise the engine speed to above 1500 rpm and check for voltage.
- If there is voltage, replace the solenoid valve and re-test.
- If there is no voltage, attach the positive probe of the voltmeter, to BLK/YEL terminal of the connector, and negative probe to body ground. Raise the engine speed to above 1,500 rpm and check the voltage.
- If there is no voltage, repair open or short in BLK/YEL wire between the solenoid valve and No. 1 fuse (15A).
- If there is voltage, inspect for an open in the WHT wire between the solenoid valve and ECU. If the wire is OK, see ECU troubleshooting.

Test II:
1. Start the engine and warm up the engine to normal operating temperature (the cooling fan comes on).
2. Disconnect the 6-P connector.





3. Attach the positive probe of the voltmeter to BLK/YEL terminal of the connector, and the negative probe to WHT terminal. Check for voltage at idle.
- If there is no voltage, replace the solenoid valve and re-test.
- If there is voltage, inspect for a short in the WHT wire between the solenoid valve and ECU. If the wire is OK, see ECU troubleshooting.