Diagnosis

To accurately diagnose the computer command ride (CCR) system, the CCR Diagnostic System Check must be performed before proceeding with any other testing. This method does not require any disassembly. First, connect a test lamp between data link connector (DLC) terminal 11 and battery. Next, connect a jumper between DLC terminals 3 and 4. Finally, turn the ignition switch to the "RUN" position. This series of steps places the controller in a "Blink Codes" mode, and will cause any error codes stored in the controller to be displayed by the test lamp. The Blink Codes sequence starts with a short lamp off period. Then, code 12 is displayed 3 times to mark the beginning of the sequence. Next, each stored error code is blinked out in ascending order. Each error code is displayed 3 times before proceeding to the next code. After all error codes have been displayed, the entire sequence will begin again by displaying code 12 three times. This will continue until the jumper between pins 3 and 4 of the DLC has been removed. [1][2]Diagnostic System Check