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DIAGNOSIS CODE NO. 51
SWITCHING SIGNAL CIRCUIT
IG SW
Neutral
start
switch (A/T)
Throttle
position
sensor
When the ECU detects malfunction of the switching cir-
cuit.
1. Check that the following wire harness connector or switch-
ing circuits are connected properly.
(1) Throttle position sensor circuit
(2) A/C switch circuit
(3) Neutral start switch circuit of the A/T.
NOTE:
•
This code will not be memorized.
•
The diagnosis code will be indicated only when the test
terminal is connected with the earth terminal as shown
in the illustration.
2. Check of wire harness and switches
(1) Connect the SST between the ECU connectors and
the wire harness connectors.
(2) Check that there is continuity between the SST termi-
nals 62 and 38 when the A/T shift lever is shifted to the
P or N position.
ACC
IG No. 1
IG No. 2
ST
Main
To starter
relay
coil
62
38
EFI ECU
6
23
54
5
20
EF–35
ACC
IG
1
IG
2
ST
MAIN
K02
M
K30
Resister
K44
K05
K07
K04
K06
K08
Z21
JEF00105-00561
Diagnosis connector
Earth
Test
terminal
terminal
JEF00106-00562
JEF00107-00563
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