RS 6 V8-4.2L Turbo (BCY) (2003)
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Check that correct engine control module for this vehicle and other control modules with CAN capability have been installed (Part no. and code).
If correct control modules are installed:
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Check for proper connection of multi-pin connectors of control modules.
If multi-pin connectors are properly attached:
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Check CAN bus system.
Checking "two-wire bus system"
Communication is implemented between three or more control modules by way of a "two-wire bus system".
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Assess faults stored in control modules.
NOTE: Assessment helps to localize wiring fault.
Example 1:
Faults entered in fault memories reveal that control module 1 has no link
with control modules 2 and 3.
Control module
Faults entered in fault memory
1
No message from control module 2
No message from control module 3
2
No message from control module 1
3
No message from control module 1
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Switch off ignition.
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Disconnect control modules linked by bus wires and examine bus wires for open circuit.
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Replace control module 1 if no faults are found in bus wires.
Example 2:
Faults entered in fault memories reveal that control module 2 has no link
with control modules 1 and 3.
Control module
Faults entered in fault memory
1
No message from control module 2
2
No message from control module 1
