I039

CIRCUIT DESCRIPTION

Code I039 will set if the ignition is on and the IPC is not able to exchange data with the RSS module (if any other communication codes are stored along with I039, see the chart of "MULTIPLE INTERMITTENT CODES"). When this is the only communication code stored, the problem must be one of the following:

^ An open in CKT 800 between the Electronic Brake and Traction Control Module (EBTCM) and RSS module and an open in CKT 800 between the RSS module and programmer (ACP).

^ An open or short in the RSS module power or ground circuits.

^ A faulty RSS module.

During the time the failure is present, no RSS diagnostic information will be available for display. The "SERVICE RIDE CONTROL" message will be displayed on the IPC. Also, while in the service diagnostic mode, this code will remain active, always checking for proper operations.

TEST DESCRIPTION

Test numbers refer to circled numbers on the diagnostic chart.

1. First check that the code is not intermittent.

2. This step determines if the fault is in the power or ground circuits or the data line.

3. This step checks if the data line fault is in CKT 800 or at the RSS module.

4. This step checks for battery voltage to the RSS module.

NOTES ON INTERMITTENTS

If only code I039 is stored as "History", check RSS power, ground and serial data CKT's.