Section 120-0010
7
SM 1574 12-98
Transmission - Transmission and Mounting
Welding on Vehicles Equipped With CEC
WARNINGS
The ECU can be damaged by improper welding
procedures.
Any time the battery equalizer is
disconnected from the batteries, remove
ground cable first, and reconnect last, to
prevent damaging the component.
When frame or other welding is required, the
following precautions are to be taken to protect the
electronic components.
a. Disconnect battery equalizer ground connection
from the batteries. Disconnect battery cables from
terminal posts (ground cable first). Disconnect
battery equalizer positive connection. Disconnect
electrical connections at the ECU.
b. If additional system ground wires are connected to
the frame, they must be disconnected also.
c. Cover electronic components and wiring to protect
from damage.
d. Do not connect welding cables to electronic
components. Do not weld on electronic components.
If welding is to be done close to electronic
components, the components should be removed
prior to the welding process.
e. On completion of all welding reconnect electrical
connections in the reverse order to step a.
TROUBLESHOOTING
Converter Stall Test
A stall test should be conducted when the power
package (engine and transmission) is not performing
satisfactorily. The purpose of the test is to determine
the engine power output and establish if the
transmission is the malfunctioning component.
WARNING
When conducting a stall test, the vehicle must
be positively prevented from moving. The
parking brake must be applied and the vehicle
should be blocked to prevent movement
forward or reverse. Keep people safely away
from the vehicle path. Do not maintain the
stalled condition longer than 30 seconds due
to rapid heating of the transmission oil. With
the transmission in neutral, run the engine at
1 200 - 1 500 rev/min for two minutes to cool
the oil between tests. Do not allow the
converter-out temperature to exceed 135° C
(275° F). Keep a close check to prevent
overheating of the engine cooling system.
1. Position the vehicle on a level area with room for
movement all round.
2. Apply the parking brake and block all road wheels.
Turn the manual mode key switch to the 'On' position
and the mode selection switch to the 'Power' mode.
3. Apply the service brake, release the parking brake
and select fifth gear on the transmission shift
selector. The transmission will shift to fifth gear and
deactivate the lockup clutch. Apply the parking brake
and release the foot pedal.
4. Accelerate the engine to full throttle and, using a
tachometer of known accuracy, note the maximum
rev/min the engine will attain. Converter-out pressure
should be 2 bar (30 lbf/in²).
Note: The stall speed of each vehicle is noted on the
final inspection records prior to the vehicle leaving
the factory. This can be used as a guide when
checking the stall speed. It is recommended to keep
a record of the stall speed after each major service
and use the previous recorded value as a guide.
5. When the stall check is complete, return the
accelerator to the idle position and move the shift
selector to the neutral position.
Note: Engine power will decrease with an increase in
elevation (altitude), becoming more pronounced at
greater elevation. This will result in a lower engine
speed under converter stall conditions.
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