C 2500 Truck 2WD V8-305 5.0L (1990)
CAUTION: Do not use a meter with an impedance of less than 10 Meg ohms.
1. Insert the positive probe into terminal 9 (circuit 907) and the negative probe into terminal 11 (circuit 361).
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Test the voltages in all three positions and compare them to the values below.
Air Inlet Door Position .............................................................................................................................................................................. Correct Feedback
Voltage ................................................................................................................................................................................................................ (+/- 0.08V)
Park (Ignition off) ........................................................................................................................................................................................................ 0.06V
Outside Air (Ignition on) ............................................................................................................................................................................................. 4.92V
Recirculation ............................................................................................................................................................................................................... 1.99V
High Speed Fan Circuit