4AT(diag)-89
Diagnostic Procedure without Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
16
CHECK SPORT/MANUAL MODE SWITCH.
1) Shift and hold the AT select lever to down
side.
2) Measure the resistance between SPORT/
manual mode switch terminals.
Connector & terminal
(B116) No. 10 — No. 11:
Is the resistance less than 1
:? Go to step 17.
Replace the guide
plate assembly.
17
CHECK HARNESS CONNECTOR BETWEEN
BODY INTEGRATED UNIT AND SPORT/
MANUAL MODE SWITCH.
1) Disconnect the connector from body inte-
grated unit.
2) Measure the resistance of harness between
body integrated unit connector and SPORT/
manual mode switch connector.
Connector & terminal
(B116) No. 11 — (B281) No. 25:
Is the resistance less than 1
:? Go to step 18.
Repair the open
circuit of harness
between the
SPORT/manual
mode switch con-
nector and body
integrated unit con-
nector, or poor
contact of connec-
tor.
18
CHECK HARNESS CONNECTOR BETWEEN
BODY INTEGRATED UNIT AND SPORT/
MANUAL MODE SWITCH.
Measure the resistance of harness between
SPORT/manual mode switch connector and
chassis ground.
Connector & terminal
(B116) No. 11 — Chassis ground:
Is the resistance 1 M
: or
more?
Go to step 19.
Repair the short
circuit of harness
between SPORT/
manual mode
switch connector
and body inte-
grated unit connec-
tor.
19
CHECK INPUT SIGNAL TO BODY INTE-
GRATED UNIT.
1) Connect all connectors.
2) Turn the ignition switch to ON (engine OFF).
3) Check the signal voltage for body integrated
unit.
Connector & terminal
(B281) No. 25 (+) — Chassis ground (–):
Is the voltage 1.5 — 8 V?
Go to step 20.
Go to step 21.
20
CHECK INPUT SIGNAL TO BODY INTE-
GRATED UNIT.
1) Shift and hold the AT select lever to down
side.
2) Check the signal voltage for body integrated
unit.
Connector & terminal
(B281) No. 25 (+) — Chassis ground (–):
Is the voltage less than 1 V?
Go to step 21.
Replace the body
integrated unit.
<Ref. to 4AT-61,
Transmission Con-
trol Module
(TCM).>
21
CHECK POOR CONTACT.
Is there poor contact in the
SPORT/manual mode switch
circuit?
Repair the poor
contact.
Temporary poor
contact of the
SPORT/manual
mode switch circuit
connector or har-
ness.
Step
Check
Yes
No