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This section describes how to program the correct turn-on temperature of the Main
Transmission Temperature gauge warning LED.This procedure is only required
when the Interface Module has been replaced or a different type of transmission has
been installed in the vehicle.
The temperature at which the warning LED lights depends upon the type of trans-
mission that is installed in the vehicle.
Installed Transmission
Allison without re-
tarder
Allison with retarder
ZF transmission
Manual transmission
1. With the ignition off, connect the HDT to the diagnostic connector (6- or 9-pin)
on the vehicle using the appropriate adapter. See Figure 6-2. The diagnostic con-
nector is usually located under the dash on the driver's side.
2. Turn the ignition on. The HDT will look for the Interface Module and try to es-
tablish communications with it while displaying:
3. Typically, this takes less than 30 seconds but can take up to 2 minutes.
a.
If communications are established, the HDT will display:
b. If communications are not established after 2 minutes, repeat this proce-
dure starting at Step 1 with the ignition off. If the HDT fails to establish
communications after three attempts, a problem may exist with the J1708
data bus. Pick a symptom from Chapter 5 that best describes the original
failure in the instrument system and follow the troubleshooting proce-
dures.
Temperature
285° F
300° F
285° F
275° F
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