P0502
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
Cruise control not working.
Low engine torque on manual cars.
Vehicle Speed. No input signal.
Fault symptoms
|
•
|
Cruise control not working.
|
|
•
|
Low engine torque on manual cars.
|
On-Board Diagnostics
Type of diagnosis:
|
-
|
Continuous. However, it is interrupted once the fault criteria have been fulfilled and does not restart until the next driving cycle.
|
Enable criteria:
(Conditions that must be fulfilled for diagnostics to be performed.)
|
-
|
Engine running. Engine speed above 2000 rpm. Load above 500 mg/c. Brake pedal not depressed.
|
Fault criteria:
(When enable criteria have been fulfilled, diagnostics will check if the fault criteria have been fulfilled.)
|
-
|
No vehicle speed for more than 5s.
Subsequently, 17 minutes without the vehicle speed deviating from 0. The gear selector on automatic cars must also have any value other than P or N. The enable criteria need not be fulfilled for these two criteria.
|
Dependents
: (Once fault criteria have been fulfilled, a number of other diagnostics must report OK before the diagnostic trouble code can finally be generated.)
System reaction to a fault:
(Once the fault criteria have been fulfilled, certain measures will sometimes be taken.)
|
-
|
Cruise control blocked. Vehicle speed (Bus from MIU) is used as a substitute value.
|
OK report:
(This diagnosis may be included as a dependent to another diagnosis and must therefore report OK even if it is continuous. The OK report is also used in fault handling to count down the fault counter.)
|
-
|
60s has passed since start. Vehicle speed has exceeded 0 on some occasion.
|
Fault handling:
(Refer to section “Fault diagnosis, general” for more information.)
Diagnostic help
Fault diagnosis concerns an electrical fault in the connecting leads. (ABS is checked first to see if the fault is there.)
Diagnostic tool functions related to this fault:
|
•
|
Diagnostic status for the diagnosis.
|
|
•
|
Vehicle speed (Lead from ABS.), unit km/h.
|
Refer also to the description of readings under ”Fault diagnosis, general” for more information
Check the wiring
Jiggle the wiring harness at several points and in different directions to check if there are intermittent breaks and short-circuits in the leads. Observe the multimeter, test lamp or diagnostic instrument during the test.
See
.
