P0502

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE. Cruise control not working.

P0502

Fault symptoms

•	CHECK ENGINE.

•	Cruise control not working.

On-Board Diagnostics

Type of diagnosis:

-	Continuous.

Enable criteria:

One of the following conditions must be fulfilled:

-	Rpm must be over 2000.

-	Injection quantity must be 22mm 3 /combustion.

-	Coolant temperature over 50 °C.

Fault criteria:

-	The speed signal from ABS is 0 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:

-	The speed signal from ABS is greater than 0 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.