Seville STS V8-4.6L VIN 9 (1998)
fan relay #1, but is now grounded through the series/parallel cooling fan relay #2 and operates at high speed. The right hand coolant fan is powered
directly through the high speed cooling fan relay #3 and also operates at high speed.
PCM will command fan operation when: Low Speed Fan Operation
^
Engine coolant temperature exceeds approximately 106°C (229°F).
^
Transmission fluid temperature exceeds 150°C (302°F).
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A/C operation is requested.
^
After the vehicle is shut OFF if the coolant temperature at key-off is more than 151°C (304°F) and system voltage was more than 12 volts. The
fans will stay ON for approximately 3 minutes.
The fans will switch from low to OFF when the coolant drops below 102°C (216°F).
High Speed Fan Operation
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Engine coolant temperature reaches 112°C (234°F).
^
Transmission temperature is more than 151°C (304°F).
^
When certain DTCs set.
The fans will switch from high to low (except DTCs set) when the coolant drops below 106°C (229°F).
PCM Controlled SMCC Cruise Control
Diagnostic Chart
This powertrain has a Stepper Motor Cruise Control (SMCC) system which closely approximates a stand alone system, except that the SMCC relies on
the PCM to indicate that cruise control is allowed and then signals the PCM when engaged. This is accomplished by using a two wire link between the
PCM and SMCC. These are called the Cruise Inhibit and the Cruise Engaged circuits. If the PCM will allow operation, refer to the Cruise Operation
table, it signals the SMCC on the Cruise Inhibit circuit to allow cruise. Once cruise is engaged by the driver, the SMCC will continuously signal to the
PCM that cruise is engaged using the Cruise Engaged circuit.
