236 CAN Timeout, Tiptronic - Signal Implausible

P0600

236 CAN Timeout, Tiptronic - Signal Implausible

Function
The CAN bus is a data transmission system specially developed for use in the vehicle. The CAN bus is bidirectional, i.e. each ECM connected to it can both send and receive.

The CAN bus consists of a twisted two-core wire.

A CAN timeout means that the Tiptronic control module was unable to establish a connection with the DME control module.

Diagnosis conditions
- Vehicle with Tiptronic transmission
- Battery voltage greater than 7 V
- Engine running

P0600:

Wiring Diagram







Diagnosis Procedure







1 Check CAN bus from DME control module to Tiptronic control module for continuity.
1. Remove DME control module connector.
2. Remove Tiptronic control module connector.
3. Connect special tool 9637 to wiring harness (DME control module connector).
4. Connect ohmmeter to special tool 9637, pin II/3, and Tiptronic control module connector, pin 85.

Display: 0 - 5 ohms

5. Connect ohmmeter to special tool 9637, pin II/4, and Tiptronic control module connector, pin 86.

Display: 0 - 5 ohms

If infinity ohms is displayed, check wiring harness for chafing and pinching damage.

2 Check CAN bus from DME control module to Tiptronic control module for short to ground.
1. Remove DME control module connector.
2. Remove Tiptronic control module connector.
3. Connect special tool 9637 to wiring harness (DME control module connector).
4. Connect ohmmeter to special tool 9637, pin II/3, and ground.

Display: infinity ohms

5. Connect ohmmeter to special tool 9637, pin II/4, and ground.

Display: infinity ohms

If 0 - 5 ohms is displayed, check wiring harness for chafing and pinching damage.

3 Check CAN bus from DME control module to Tiptronic control module for short to B+.
1. Remove DME control module connector.
2. Remove Tiptronic control module connector.
3. Connect special tool 9637 to wiring harness (DME control module connector).
4. Connect voltmeter to special tool 9637, pin II/3, and ground.

Switch on the ignition.
Display: 0 V

5. Connect voltmeter to special tool 9637, pin II/4, and ground.

Switch on the ignition.
Display: 0 V

If battery voltage is displayed, check wiring harness for chafing and pinching damage.

4 Check CAN bus from DME control module to Tiptronic control module for short circuit.
1. Remove DME control module connector.
2. Remove Tiptronic control module connector.
3. Connect special tool 9637 to wiring harness (DME control module connector).
4. Connect ohmmeter to special tool 9637, pins II/3 and II/4.

Display: infinity ohms

If 0 - 5 ohms is displayed, check wiring for chafing and pinching damage.