Question about 1998 Isuzu Trooper

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I have flashing 4wd light but no engagement on my 98' Trooper. I took the vacuum actuator off and tested to see if it is stuck. It wasn't. If I applied vacuum to the blue it stayed in normal position and if I applied vacuum to the white it would extend into the 4wd position. I tried to test the vacuum. There was vacuum on the blue, but when I pushed the 4x4 button I hear a small noise like something is trying to work, but no vacuum is found in the white line to engage the 4x4. Is there a vacuum control switch/module/solenoid that needs to be replaced? Where is it? Is it the blue/gray vaccuum thing with the wires? Is there another potential problem?

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You can check the continuity of the VSV assembly units you are working with (what you are referring to as blue and white).

Inspection (1) - Remove the connector, shift transfer lever to 2H and start the engine. Make sure there is continuity in the vehicle side of the harness. If there is none, check the transfer shift switch and wiring.

Inspection (2) - Inspect both VSV units as follows:
A) With battery not connected
Measure A-C for continuity, B is closed
B) With battery connected
Measure A-B for continuity, C is closed.

If either A) or B) fail, replace the VSV unit.

Posted on Apr 09, 2011

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