SYMPTOM RELATED DIAGNOSTICS

INTERMITTENT PROBLEMS (continued)

r As a final test before replacing the V-MAC II module, reconnect the module and confirm that the fault still exists.

r If the V-MAC II module is replaced, verify that the new module has fixed the problem.

r Do not reprogram a replacement V-MAC II module until verifying that it has fixed the problem.

Do not program a replacement V-MAC II module with MACK DATA PROGRAMMING until it is confirmed that replacing the V-MAC II module has corrected the problem. Reprogramming with MACK DATA PROGRAMMING executes a password protection function which assigns a new password to the vehicle. THIS PROCESS IS IRREVERSIBLE! If the old module was not the problem and is reinstalled on the vehicle, it cannot be reprogrammed because the password will no longer match.

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