P1577

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE. Cruise control not working.

P1577

Fault symptoms

•	CHECK ENGINE.

•	Cruise control not working.

On-Board Diagnostics

Type of diagnosis:

-	Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.

Enable criteria:

-	General conditions for this trouble code: When starting the engine, the atmospheric pressure must exceed 78 kPa and the engine coolant and intake air temperatures must exceed -7°C.

-	Engine running. Vehicle speed has dropped from 40 km/h to 0 km/h in 2 to 12 s on 5 occasions.

Fault criteria:

-	No battery voltage on control module input on any occasion.

Dependents:

-

None.

System reaction to a fault:

-	Cruise control blocked.

OK report:

-	Brake pedal depressed and then released on one occasion.

Fault handling: (See “Fault diagnosis, general” for more information.)

-

Type III.

Diagnostic help

Fault diagnosis concerns an electrical fault in the connecting leads.

Functions in the diagnostic tool related to the fault:

•	Diagnostic status for the diagnosis.

•	Brake light, unit ON/OFF.

See also the description of readings in ”Fault diagnosis, general” for more information.

Checking the wiring

Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Observe the multimeter, diagnostic tool or test lamp during the check.

See .