Mazda 1990 323 Workshop Manual Supplement page 320

K2
ELECTRONIC SYSTEM COMPONENTS
EC-AT CONTROL UNIT
Inspection
1. Turn the ignition switch ON, and check the EC-AT control
unit terminal voltage, referring to the Terminal Voltage Chart.
2. If not correct, check and replace or repair the component(s),
wiring, and/or EC-AT control unit.
03UOKX-151
-
Terminal Voltage Chart
2s 2Q 20 2M 2K 21
2G 2E 2C 2A 10 1M 1K II
1G 1E 1C 1A
2T 2R 2P 2N 2L 2J 2H 2F 20 28 1P 1N 1L 1J 1H 1F
1D 1B
9MUOKl-08:
T
J
Voltage
I
Condition
I
Terminal Connection to
Voltmeter
+ terminal . -terminal
-
I
-
I
1A
-
-
1 B (Output) Hold indicator
1B
Below 1.5V ) Hold mode
I
Approx. 12V 1 Normal mode
I
Approx. 12V Normal (With EC-AT Tester)
I
Below 1.5V or
Approx. 12V If malfunction present (With EC-AT Tester)
(fluctuating)
Code signal Diagnosis connector grounded (With EC-AT Tester)
EC-AT tester
" (Output) (Malfunction code)
1c
Approx. 12V 1 P or N ranges
I
1D (Output) No load signal
ID
Below 1.5V I Other ranges
I
Ground
Approx. l2V
I
Normal
I
Below 1.5V TAT terminal grounded
Approx. 12V Brake pedal depressed
Below l.5V I Brake pedal released
I
Below 1.5V 1 Above 145% (293OF)
I
Approx. 12V Below 138°C (211 OF)
Below 1.5V Switch depressed
Approx. 12V 1 Switch released
I
II
I - I - I
-
I
Ground Below 1.5V 1
- I
1 J (Ground) Battery ground 1J
IK
- -
-
I -*
- -
1L I -
I -
IM
I I -
I
-
I
K2-144