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AUTO-CRUISE CONTROL
10. CHECKING THE CIRCUITS RELATED TO THE OVERDRIVE-CANCELLATION FUNCTION <A/T>
Overdrive
Auto-cruise
control unit
Cruise-control
4 A/T
control
module
SYSTEM - Troubleshootina
Description of operation
This is a function that cancels the overdrive function for a
certain fixed period of time, if during constant-speed travel in
overdrive, the actual vehicle speed decreases to less than the
time causes the vehicle speed to return to the vehicle speed
retained in the memory.
Overdrive is cancelled under the following conditions.
If, during constant-speed travel, the actual vehicle speed
decreases to 7 km/h (4.4 mph) or more below the set vehicle
speed.
Under either of the conditions described above, the overdrive-
ON signals output from the microcomputer (with the control
unit) are no longer output, and transistor Tr, is switched OFF.
As a result, transistor Tr2 is also switched OFF, causing the
current passing through the overdrive switch of the selector
handle to be interrupted at transistor Tr2. with the result that the
drive is controlled at 3rd gear.
Troubleshooting hint
ECU terminal voltage
Terminal
TSB Revision
Signal
I
No.
4 A/T control
When the overdrive
10
switch is switched
module
ON.
When the overdrive
11
switch is switched
ON.
Terminal
Conditions
positive
voltage
Battery
positive
voltage
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Troubleshooting
