Specifications

AUTOMATIC TRANSMISSION -
Troubleshooting
23-17
Code No. 23 Output shaft speed sensor system Probable cause
If the output from the output shaft speed sensor is continuously 50% lower than the
vehicle speed for 1 second or more while driving in 3rd or 4th gear at a speed of
30 km/h or more, there is judged to be an open circuit or short-circuit in the output
shaft speed sensor a nd diagnosis code No. 23 is output.
If diagnosis code No. 23 is output four times, the transmission is locked into 3rd
gear (D range) or 2nd gear as a fail-safe measure, and the N range lamp flashes
at a frequency of 1 Hz.
D Malfunction of the output shaft speed sensor
D Malfunction of the transfer drive gear or driven gear
D Malfunction of connector
D Malfunction of the A/T-ECU
L
: Refer to the Transmission Workshop Manual.
A/T overhaul L
D Replace the transfer drive gear and
driven gear.
Check the trouble symptoms.
NG
Eliminate the cause of the noise.
Replace the A/T-ECU.
Replace the A/T-ECU.
NG
OK
Check the trouble symptoms.
OK
Check the following harness:
D Between the output shaft speed
sensor an d the ignition switch
D Between the output shaft speed
sensor and A/T-ECU
NG
Repair
NG
Check the trouble symptoms.
NG
OK
Check the trouble symptoms.
OK
Measure output waveform of the output
shaft speed sensor.
(using an oscilloscope)
D Engine: 2,000 r/min
(approx. 50 km/h)
D Transmission: 3rd gear
(Voltage)
OK:
Conforms to the waveform
shown at page 23-45 (Inspec-
tion procedure using an oscil-
loscope). There is no noise
in the output waveform.
NG
Replace the output shaft speed sensor.
Measure at the output shaft speed sen-
sor connector B-68.
D Disconnect th e connector and
measure at the harness side.
(1) Voltage between 3 and earth
(Ignition switch: ON)
OK:
Battery voltage
(2) Voltage between 2 and earth
(Ignition switch: ON)
OK:
approx. 5 V
(3) Continuity between 1 and earth
OK:
Continuity
NG
Check the following connectors:
B-68, C-29
NG
Repair
Code No. 25 Wide open throttle switch system Probable cause
If the wide open throttle switch is on for 1 second or more with the throttle valve
opening angle at 70% or less, it is judged that there is a short circuit in the wide
open throttle switch a nd diagnosis code No. 25 is output.
D Malfunction of the wide open throttle switch
D Malfunction of connector
D Malfunction of A/T-ECU
Wide open throttle switch check (Refer to P.23-64).
NG
Replace
OK
Check the following connectors:
C-18, C-30, C-83
NG
Repair
OK
Harness check
D Between the wide open throttle switch and the A/T-ECU.
NG
Repair
OK
Check the trouble symptoms.
NG
Replace the A/T-ECU.