Check Input Signal For Ecu; Check Harness Connector Between Ecu And Crank Angle Sensor; Check Crank Angle Sensor - Subaru SVX 1992 Manual

FUEL INJECTION SYSTEM
[T9A3) 2-7
1 . CHECK INPUT SIGNAL FOR ECU .
1) Turn ignition switch to "OFF" .
2) Disconnect ECU connectors .
3) Check input signal for ECU from crank angle sensor
1 .
Using oscilloscope
(1) Set the positive (+ ) probe at (1361) terminal No . 1,
and set earth lead at (1361) terminal No . 2.
(2) Cranking the engine, and check wave profile .
,-1g . bb
Using voltage meter
Check if voltage varies synchronously with engine
revolution when cranking, while monitoring voltage
between ECU connector terminal .
Connector it Terminal/Specified voltage
(1361) No . 1 - No . 2/AC 0.1 V, min .
2. CHECK HARNESS CONNECTOR BETWEEN
ECU AND CRANK ANGLE SENSOR 1 .
1) Turn ignition switch to "OFF".
2) Remove alternator .
3) Disconnect connector from ECU and crank angle
sensor 1 .
4) Measure resistance of harness connector between
ECU and crank angle sensor 1 .
Connector Fr Terminal/Specified resistance
(1361) No . 1 - (E21) No . 2/0 f2
(1361) No . 2 - (E21) No . 1/0 f2
5) Measure resistance between ECU connector and
body to check short circuit.
Connector £t Terminal/Specified resistance
(1361) No . 1 - Body/1 Mfg min.
(1361) No. 2- Body/1 MQ min.
(1361) No . 3-Body/1 Mfg min.
Crank angle sensor 1
Crank angle
sensor 2 ,
yJ ~ _
~
y
E21~
III '
C2-340
Fig. 56
3 . CHECK CRANK ANGLE SENSOR 1 .
1) Remove crank angle sensor 1 .
2) Set the positive (+ ) probe at sensor connector
terminal No . 1, and set earth lead at terminal No . 2.
3) Check a wave profile appears crossing a magnet
near the pick-up coil of crank angle sensor 1 .
Fig. 57
55