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mode selected by the technician, a sequence of one or more groups of blinks. Simply record the number of blinks for each sequence and then use the troubleshooting index on page 17 for active or inactive trouble codes and you will be directed to the page that provides troubleshooting information.
NOTE:
1.Sequences of blinks illuminate the ABS indicator lamp for half a second, with
2.Pauses between blink code digits are 1.5 seconds.
3.Pauses between blink code messages are 2.5 seconds.
4.The lamp remains on for 5 seconds at the end of messages.
Once the ABS indicator lamp begins displaying a sequence of codes, it continues until all blink code messages have been displayed and then returns to the normal operating mode. During this time, the ECU will ignore any additional blink code switch activation.
All trouble codes, with the exception of voltage and J1939 trouble codes, will remain in an active state for the remainder of the power cycle.
Voltage trouble codes will clear automatically when the voltage returns within the required limits. All ABS functions will be
J1939 trouble codes will clear automatically when communications are
DIAGNOSTIC MODES
In order to communicate with the ECU, the controller has several modes that the technician can select, allowing information to be retrieved, or other ECU functions to be accessed.
Diagnostic Modes
To enter the various diagnostic modes:
No. of Times to
Press the BlinkSystem Mode Entered Code Switch
1Active diagnostic trouble code retrieval
2Inactive diagnostic trouble code retrieval
3Clear active diagnostic trouble codes
4System configuration check
5Dynamometer Test Mode
7* Reconfigure ECU
*To enter the Reconfiguration Mode, the switch must be held in before the application of ignition power. Once the power is supplied, the switch is released and then pressed seven times.
CHART 2 - DIAGNOSTIC MODES
Active Diagnostic Trouble Code Mode
For troubleshooting, typically the Active and Inactive Diagnostic Trouble Retrieval Modes are used. The technician presses the blink code switch once and the ABS indicator lamp flashes a first group of two codes, and if there are more trouble codes recorded, this is followed by a second set of codes, etc. (See page 17 for a directory of these codes.) All active trouble codes may also be retrieved using
a
To clear active diagnostic trouble codes (as problems are fixed), simply clear (or
Inactive Diagnostic Trouble Code Mode
The ECU stores past trouble codes and comments (such as configuration changes) in its memory. This record is commonly referred to as “event history.” When an active trouble code is cleared, the ECU stores it in the event history memory as an inactive trouble code.
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