P1654

P1654

Coolant Switch-over Valve Driver, Above Limit Value

Diagnostic conditions
- Supply voltage > 7 V
- Engine running
- Coolant change-over valve activated (ATF cooler closed)
- for 997 coolant temperature < 90 degrees C (194 degrees F) and ATF temperature < 83 degrees C (181 degrees F)
- for 987 coolant temperature < 80 degrees C (176 degrees F) and ATF temperature < 75 degrees C (167 degrees F)

Possible fault causes
- Short circuit to B+ in control line
- Coolant switch-over valve faulty
- DME control module faulty