STARTING AND STOPPING PROCEDURES
STEERING COMPARTMENT 07005
To enhance troubleshooting and to allow interro-
gation of the ECU for valuable service infor-
mation, a DDR (diagnostic data reader) can be
used. To use it, plug the appropriate connector
(not furnished by the manufacturer) in the termi-
nal located in the steering compartment or the
DDR connector located on L.H. side control
panel. You can also use your push-button shifter
to perform certain maintenance operations (see
page 4-6 under "Diagnostic codes").
Output Retarder (optional)
The purpose of the retarder is to assist in stop-
ping the vehicle during stop and go driving and
to control the downhill speed of the vehicle on a
grade. For both of these uses, the retarder
serves to extend the life of the service brakes
and to enhance vehicle con-
trol. The retarder system is
activated by turning "ON" the
retarder enable switch (L.H.
side control panel-item #4 on
page 2-4).
The retarder controls are
broken down into two (2)
types:
BRAKE APPLY - actuated by
brake pressure; applies the
retarder at three (3) distinct
retardation levels (low = 1/3 -
2 psi, medium = 2/3 - 4 psi, and "full on" - 7 psi)
when increasing pressures are detected in the
brake system.
Warning: Always manually disable the retarder
controls (turn off enable switch) during inclement
weather or slippery road conditions.
18018
AUTOMATIC APPLY - actuated by hand lever
located on R.H. side of steering column; retarder
capacity is determined by hand lever which per-
mits the operator to select "OFF", or one of six
(6) levels of automatically-commanded retarda-
tion, the highest of which is maximum retarder
capacity "full on".
The controls may be used in combinations such
that the retarder can be activated when either of
the two (2) controls are actuated. (If both are
actuated simultaneously, the level of retardation
will correspond to higher input signal).
The optimum retarder control will depend on the
vehicle type and retarder use. In general maxi-
mum brake savings occur with increased retard-
er use. In stop and go driving, retarder use can
be maximized by using the "BRAKE APPLY".
For downhill speed control, the "AUTOMATIC
APPLY" may provide the best operator control.
When the vehicle is equipped with the anti-lock
braking system (ABS) and the system is activat-
ed, the transmission controls "ABS input" is used
to disengage the retarder and the transmission
lockup clutch, thus enhancing performance of
the ABS system.
Diagnostic Telltales
Two (2) diagnostic features are available with the
transmission control system to assist in trouble-
shooting of malfunctions and/or the monitoring of
specific operating parameters. These features
include a "DO NOT SHIFT" light on the dash-
board, and the Diagnostic Data Reader (DDR).
When a malfunction is detected in the control
system, a series of "diagnostic codes" are used
to identify and clarify the nature of the malfunc-
tion.
4 - 5
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