Mazda 1990 323 Workshop Manual Supplement page 192

K2
SELF-DIAGNOSIS SYSTEM
FAIL-SAFE FUNCTION
lf a malfunction occurs in any of the following components, the fail-safe function makes it
possible to drive
the vehicle with only slightly diminished performance. Hold mode cannot be selected while driving in the
fail-safe mode.
1. Vehicle speed sensor
-
Shifting is performed normally. If the pulse generator or a solenoid valve also fails, operation of all solenoid
valves is canceled.
2. Throttle sensor
The EC-AT control unit considers the throttle opening to be at 4/8 stroke. Shifting is performed in accor-
dance with signals from the vehicle speed sensor and the shift pattern for that fail-safe mode.
Lockup is not provided.
3. Pulse generator
Shifting is performed in accordance with signals from the vehicle speed sensor and the shift pattern for
that fail-safe mode. If a malfunction occurs at one of the solenoid valves along with a malfunction of the
pulse generator, the operation of the malfunctioning valve is canceled.
4. 1-2, 2-3, or 3-4 solenoid valve
The operation of the remaining solenoid valve(s) performs the shifting with as little interference as possible
with driving performance. If a malfunction occurs at all four solenoid valves, 3rd, 1st and reverse gears
are obtained hydraulically.
Note
l
If all solenoid valves are switched OFF, D and S ranges become 3rd gear position, L range
becomes 1st gear position, and R range remains reverse gear position.
5. Lockup solenoid valve
The solenoid valves for shifting operate normally but no lockup is obtained.
03UOK2-014
DISPLAY OF MALFUNCTION CODE
If a malfunction occurs in components which the EC-AT control unit can diagnose, the control unit causes
the HOLD indicator to flash while the malfunction is continuing. At the same time, the control unit memorizes
the code of the malfunction for later retrieval with the
EC-AT Tester
and
System Selector.
The flashing of the HOLD indicator ceases if the malfunction recovers.
When the TAT and GND terminals of the diagnosis connector are jumped with the ignition switch ON, the
EC-AT control unit outputs any memorized malfunction codes by flashing the HOLD indicator.
The
EC-AT Tester
with
System Selector
will display these codes as malfunction code numbers when con-
nected to the diagnosis connector.
If there is more than one malfunction, the code numbers are displayed sequentially in numerical order.
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K2-16