P1655

P1655

Coolant switch-over valve driver, below limit value

Diagnostic conditions
- Supply voltage > 7 V
- Engine running
- Coolant change-over valve not activated (ATF cooler open)
- for 997 coolant temperature > 100 °C (212 °F) or ATF temperature > 90 °C (194 °F)
- for 987 coolant temperature > 90 °C (194 °F) or ATF temperature > 90 °C (194 °F)

Possible fault causes
- Short circuit to ground in control line
- DME control module faulty