AUTOMATIC TRANSMISSION ± Troubleshooting <A/T>
23-12
Code No. 38 Vehicle speed sensor system Probable cause
If no output pulse is detected from the vehicle speed sensor for 120 seconds or
more continuously while driving at a speed of 60 km/h or more, there is judged
to be an open circuit in the vehicle speed sensor and diagnosis code No. 38 is
output.
D Malfunction of the vehicle speed sensor
D Malfunction of harness or connector
D Malfunction of the A/T-ECU
D Malfunction of the ignition switch
Check the trouble symptoms.
OK
Replace the A/T-ECU.
Replace the A/T-ECU.
NG
OK
Check the trouble symptoms.
OK
NG
Repair
Check the ignition switch. (Refer to
GROUP 54.)
OK
OK
Check the trouble symptoms.
OK
Check the following connectors:
B-08, D-02, D-04
NG
Check the harness wire between
vehicle speed sensor and earth, and
repair if necessary.
Measure at the vehicle speed sensor
connector B-08.
D Disconnect the connector and
measure at the harness side.
(1) Voltage between 1 and earth
(Ignition switch: ON)
OK: System voltage
(2) Voltage between 3 and earth
(Ignition switch: ON)
OK: 4.8 ± 5.2 V
(3) Continuity between 2 and earth
OK: Continuity
(1) NG
Check the following connectors:
<L.H. drive vehicles> D-02, C-38, C-02,
C-76, C-74
<R.H. drive vehicles> D-02, C-41, C-76,
C-74
NG
Repair
Vehicle speed sensor check (Refer to
GROUP 54 ± Combination meter.)
OK
NG
Replace
OK
NG
Repair
NG
Check the harness wire between
A/T-ECU and vehicle speed sensor.
Repair
NG
Check the harness wire between igni-
tion switch and vehicle speed sensor.
Check the following connectors:
D-02, D-04
NG
Repair
NG
Check the harness wire between
A/T-ECU and vehicle speed sensor.
Repair
(2) NG
(3) NG
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