1. Set parking brake.
2. Depress the Engine Diagnostics switch .
3. Turn the ignition switch ON. Do not start the engine. The ECM will begin the Output Circuit Check (self test). If DTCs are detected, the ECM will flash the WARN ENGINE light.
When the self test is over, the ECM will flash the red OIL/WATER light and amber WARN ENGINE light to signal the Diagnostic Trouble Codes
NOTE: All Diagnostic Trouble Codes are three digits. Code 111 indicates that no Diagnostic Trouble Codes have been detected.
4. Count the flashes in sequence. After each digit of the code a short pause will occur.
Three flashes and a pause indicate number 3
Two flashes , a pause, three flashes , a pause, and two flashes and a pause indicate code 232.
5. For more than one Diagnostic Trouble Code, the OIL/WATER light will flash once indicating the beginning of another active Diagnostic Trouble Code.
6. After all active Diagnostic Trouble Codes have flashed, the OIL/WATER light will flash twice to indicate the start of inactive Diagnostic Trouble Codes. Count the flashes from the WARN ENGINE light. If there is more than one inactive code, the OIL/WATER light will flash once in between each Diagnostic Trouble Code.
7. After all Diagnostic Trouble Codes have been sent, the OIL/WATER light will flash three times indicating end of message.
8. To repeat Diagnostic Trouble Code transmission, depress the Engine Diagnostic Switch. The ECM will resend stored Diagnostic Trouble Codes.