Checking The Parameters
HINT: A number conditions must be met for cruise control to be allowed by the engine control module (ECM). Some of these conditions are speed related (at least 30 km/h), the clutch and the brake pedal must not be depressed and certain diagnostic trouble codes (DTCs) must not be stored etc.
HINT: If the diagnostic trouble code (DTC) for CAN communication in the high speed network is stored in the central electronic module (CEM), these diagnostic trouble codes (DTCs) must be fault traced before carrying out the following fault-tracing.
- Ignition on
- Cruise control switch on.NOTE:
If the cruise control is switched off, incorrect values for the switch will be displayed.
- Read off parameters.
Check that:
- The clutch pedal sensor is "Active". The engine control module (ECM) calculates the status from the central electronic module (CEM) via CAN communication.
HINT: Check that the clutch pedal sensor is correctly installed/adjusted if the status is incorrect.
NOTE:On cars with automatic transmissions, the parameter for the clutch pedal position sensor displays "Active" (the clutch pedal position sensor allows the cruise control to function).
- The stop lamp switch is "ON". The engine control module (ECM) calculates the status from the directly connected signal from the stop lamp switch.
HINT: Check that the stop lamp switch is correctly installed/adjusted if the status is incorrect.
- Cruise control SET+ is "ON" when the switch is pressed in. The engine control module (ECM) calculates the status from the steering wheel module (SWM) via CAN communication
- Cruise control SET- is "ON" when the switch is pressed in. The engine control module (ECM) calculates the status from the steering wheel module (SWM) via CAN communication
- Cruise control RESUME is "ON" when the switch is pressed in. The engine control module (ECM) calculates the status from the steering wheel module (SWM) via CAN communication.
If the status (via CAN) from other control modules is incorrect, these control modules must be fault traced first. Read off the diagnostic trouble codes (DTCs) in the relevant control modules.
If the status from directly connected cables to the engine control module (ECM) is incorrect, these cables must be fault traced.
Remedy as necessary.
If VIDA is not communicating with the engine control module (ECM), fault-trace the CAN network and check the power and ground terminals for the engine control module (ECM).
Other information:
- The clutch pedal sensor is "Active". The engine control module (ECM) calculates the status from the central electronic module (CEM) via CAN communication.