Federal and High Altitude Man. Trans. Only
- Disconnect hose from vacuum switch B and connect hand vacuum pump to the hose. Apply vacuum to the switch. There should be voltage at control unit Green wire when less than 4 in. Hg vacuum is applied. If there is no voltage, replace vacuum switch and retest.
- Disconnect hose from vacuum switch A and connect hand vacuum pump to the hose. Apply vacuum to the switch. There should be voltage at control unit Blue/Black wire when less than 9.8 in. Hg vacuum is applied. If there is no voltage, replace vacuum switch and retest.