3. CHECK DTC (C1789)
(a) Check for DTC C1789 See: Steering and Suspension/Suspension/Testing and Inspection/Reading and Clearing Diagnostic Trouble
Codes
Result:
B -- CHECK CAN COMMUNICATION SYSTEM
A -- END
1. CHECK CAN COMMUNICATION SYSTEM
(a) Check the CAN communication system for any malfunctions See: Powertrain Management/Computers and Control
Systems/Information Bus/Testing and Inspection/Initial Inspection and Diagnostic Overview/CAN Communication System/Diagnosis
System.
Result:
B -- GO TO CAN COMMUNICATION SYSTEM See: Powertrain Management/Computers and Control Systems/Information
Bus/Testing and Inspection/Initial Inspection and Diagnostic Overview/CAN Communication System/How to Proceed With
Troubleshooting
A -- Continue to next step.
2. CHECK ECM
(a) Check if the part number of the installed ECM is correct.
OK:
An ECM with the correct part number is installed.
NG -- REPLACE ECM See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and
Repair/Removal
OK -- REPLACE SUSPENSION CONTROL ECU
From 08/2009
SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1789: Vehicle Identification Malfunction
C1789 - Vehicle Identification Malfunction
DESCRIPTION
- This DTC is stored when the suspension control ECU is initialized, and is cleared when the vehicle identification information received through
CAN communication is correctly stored in the EEPROM.
- DTC C1789 is stored as the vehicle specification and data do not match when an incorrect ECM is installed.
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