To help locate intermittents, it sometimes helps to place the appropriate tester on
the suspected component or circuit and simulate operating conditions—wiggle,
pull, bump, and bend while watching the tester.
g. Exiting Diagnostic Mode.
NOTE: Strip Pushbutton Shift Selectors cannot display or clear
diagnostic codes.
To exit the diagnostic mode, do one of the following:
• Do nothing; wait until the calibrated time has passed and the system
automatically returns to normal operation.
• Using a pushbutton shift selector, simultaneously press the ↑ (Up) and
↓ (Down) arrow buttons.
• Using a pushbutton shift selector, press N (Neutral).
• Using a lever shift selector, press the DISPLAY MODE button once.
• Using a lever shift selector, move the selector lever to any position other
than the one it was in when the diagnostic display mode was activated.
2–12. TRANSMISSION STALL TEST AND NEUTRAL COOL-DOWN
CHECK
a. Purpose. Stall testing is performed to determine if a vehicle performance
complaint is due to an engine or transmission malfunction. Stall testing is a
troubleshooting procedure only—never perform a stall test as a general test or
during routine maintenance.
Transmission stall speed is the maximum engine rpm attainable when the engine
is at full throttle and the torque converter turbine is not moving, or “stalled.” After
a transmission stall test, compare the actual full throttle engine speed at torque
converter turbine stall with specifications established by the vehicle manufacturer.
NOTE: Engine speed data can be obtained from the engine
manufacturer or from the equipment dealer or distributor. Some engine
manufacturers provide a programmable parameter to limit engine speed
when the transmission output speed is 0 rpm, such as at a stop. This
parameter should be set to a higher value than the expected transmission
stall speed before performing the stall test.
b. Stall Testing Preparation. If a transmission stall test is to be performed,
make sure the following preparations have been made before conducting the
transmission stall test:
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