5AT(diag)-71
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
2
CHECK HARNESS CONNECTOR BETWEEN
TCM AND BODY HARNESS.
Measure the resistance of harness between
TCM connector and body harness.
Connector & terminal
(B54) No. 18 — Chassis ground:
Is the resistance more than 1
M
Ω?
Go to step 3.
Repair the short
circuit of harness
between TCM and
transmission con-
nector.
3
CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND CONTROL VALVE
BODY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from transmis-
sion.
3) Remove the transmission connector from
bracket.
4) Jack-up the vehicle and place it on rigid
racks.
NOTE:
Raise all wheels off floor.
5) Drain the ATF.
CAUTION:
Do not drain the ATF until it cools down.
6) Remove the oil pan, and disconnect the
control valve body connector.
7) Measure the resistance between transmis-
sion connector and control valve body connec-
tor.
Connector & terminal
(T4) No. 18 — (T11) No. 8:
Is the resistance less than 1
Ω?
Go to step 4.
Repair the open
circuit of harness
between control
valve body con-
nector and trans-
mission connector.
4
CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND CONTROL VALVE
BODY.
Measure the resistance between chassis
ground and control valve body connector.
Connector & terminal
(T11) No. 8 — Chassis ground:
Is the resistance more than 1
M
Ω?
Go to step 5.
Repair the short
circuit of harness
between control
valve body con-
nector and trans-
mission connector.
5
CHECK INPUT CLUTCH SOLENOID.
Measure the resistance between transmission
ground and control valve body connector.
Connector & terminal
(T11) No. 8 — Transmission ground:
Is the resistance 3 — 9
Ω
Go to step 6.
Replace the con-
trol valve body.
<Ref. to 5AT-58,
Control Valve
Body.>
6
CHECK POOR CONTACT.
Check that there are no poor contact in TCM
connector, transmission connector and control
valve body connector.
Is there any loosing terminal,
entering foreign matter, dam-
aging connector body?
Repair the poor
contact.
Go to step 7.
7
CHECK AFTER REPAIR.
1) Perform the clear memory mode.
2) Drive for a while, read the DTC, and verify
that there is no faulty.
Is DTC displayed?
Replace the TCM.
<Ref. to 5AT-61,
Transmission Con-
trol Module
(TCM).>
Temporary poor
contact or open
circuit occurs.
Recheck that the
harness connec-
tor has no faulty.
Step
Check
Yes
No