General Information

General Information

HINT: For general information about fault-tracing the control area network (CAN), see the linked document below.

NOTE: When selecting the vehicle profile, the correct vehicle must be identified. Use the "Retrieve VIN" button. The fault-tracing may fail if this is not done.

In order to check the control area network (CAN) cables, the resistance in the network must be measured. When the network is connected, the resistance between the two CAN cables must be 60 ohms in the high speed network. Generally the permitted values 55-65 ohms.

NOTE: Resistance will only be 60 ohms if the main artery of the CAN network is whole and the network is connected. If the main artery of the CAN network is split somewhere and a reading is taken between the CAN cables, resistance will be 120 ohms.

If diagnostic trouble codes (DTCs) for communication faults can be read off from a control module, the fault is probably intermittent.

Intermittent fault in the voltage supply to a control module on the CAN network results in the Central electronic module (CEM) storing a diagnostic trouble code (DTC) for an open-circuit in communication with the control module where the voltage supply does not work. There will probably not be a diagnostic trouble code (DTC) in the control module where the open-circuit in the voltage supply occurred as the control module cannot store a diagnostic trouble code (DTC) when it is not supplied with power.

CAUTION: During this fault-tracing use the wiring diagram to provide support when taking readings.

Other Information
- General information about fault-tracing in the CAN network

Continue: Refer to Taking Reading on Cables In the Can Network (HS-CAN). Taking Reading on Cables In the CAN Network (HS-CAN)