CAN Timeout - Signal Implausible

P0600

CAN Timeout - 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. Currently only the DME control module and Tiptronic control module are connected to it.

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

Diagnosis conditions
- Vehicle with Tiptronic transmission
- Battery voltage greater than 7 V
- Idle speed

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 ohmmeter to DME control module connector, pin 85, and Tiptronic control module connector, pin 85.
Display: 0 - 5 ohms

4. Connect ohmmeter to DME control module connector, pin 86, and Tiptronic control module connector, pin 86.
Display: 0 - 5 ohms

If Infinity ohm 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 9616 to wiring harness (DME control module connector).
4. Connect ohmmeter to special tool 9616, pin 85, and ground.
Display: Infinity ohm

5. Connect ohmmeter to special tool 9616, pin 86, and ground.
Display: Infinity ohm

If 0 - 5 ohms is displayed, check wiring 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 9616 to wiring harness (DME control module connector).
4. Connect voltmeter to special tool 9616, pin 85, and ground. Switch on the ignition.
Display: 0 V

5. Connect voltmeter to special tool 9616, pin 86, 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 9616 to wiring harness (DME control module connector).
4. Connect ohmmeter to special tool 9616, pins 85 and 86.
Display: Infinity ohm

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