Grand Prix V6-204 3.4L DOHC (1992)
Chart C-12, Cooling Fan Control Circuit Diagnosis (1 of 2)
Numbers below refer to circled numbers on diagnostic chart.
1.
With the diagnostic terminal grounded, the PCM should energize the cooling fan relays and fans should run.
2.
Checks for faulty A/C pressure sensor or circuit. If sensor signal indicates pressure above 300 psi (2069 kPa), or if circuit 802 is open, fans should
run when ever A/C is requested.
3.
With A/C clutch engaged and pressure sensor functioning correctly, fan should turn "ON" when pressure exceeds about 200 psi (1380 kPa.)
4.
This test determines if the A/C pressure sensor is faulty, or if the PCM or wiring is the problem.
DIAGNOSTIC AIDS
