P0501

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE. Cruise control not working.

P0501

Fault symptoms

•	CHECK ENGINE.

•	Cruise control not working.

On-Board Diagnostics

Type of diagnosis:

-	Continuous.

Enable criteria:

-	Engine running.

Fault criteria:

-	The speed change between two signals from ABS exceeds 50 km/h.

Dependents:

-

None.

System reaction to a fault:

-	The following limitations apply: ECM will continue to use a substitute value of 0 km/h and cruise control is switched off.

OK report:

-	When the speed change between two signals from ABS falls below 50 km/h.

Fault handling: (See section Fault handling III, other emissions-related components and functions for more information)

-

Type III.

Diagnostic help

Fault diagnosis concerns an electrical fault in connecting leads or in the sensor.

Functions in the diagnostic tool related to the fault:

-	Read value: Vehicle Speed

On cars equipped with TC/ABS, the speed signal travels on the BUS.

See also description of read value under "Read Values" menu 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.