Specifications

AUTOMATIC TRANSMISSION -
Troubleshooting
23-22
Code No. 43 3rd gear ratio does not meet the specification Probable cause
If the output from the output shaft speed sensor multiplied by the 3rd gear ratio is
not the same as the output from the input shaft speed sensor after shifting to 3rd
gear has been completed, diagnosis code No. 43 is output. If diagnosis code No.
43 is output four times, the transmission is locked into 3rd gear as a fail-safe measure,
and the N range lamp flashes at a frequency of 1 Hz.
D Malfunction of the input shaft speed sensor
D Malfunction of the output shaft speed sensor
D Malfunction of the underdrive clutch retainer
D Malfunciton of the transfer drive gear or driven gear
D Malfunction of the underdrive clutch system
D Malfunction of the overdrive clutch system
D Noise generated
L
: Refer to the Transmission Workshop Manual.
MUT-
II
Self-Diag code
Is the diagnosis code No. 22 output?
Yes
Code No. 22 Input shaft speed sensor system check
(Refer to P.23-16.)
No
MUT-
II
Self-Diag code
Is the diagnosis code No. 23 output?
Yes
Code No. 23 Output shaft speed sensor system check
(Refer to P.23-17.)
No
Measure output waveform from the input shaft speed sensor. (using
an oscilloscope)
D Connect the connector B-71 and measure voltage between
31 and 43 at the A/T-ECU.
D Engine: 2,000 r/min (approx. 50 km/h)
D Selector lever position: 3
(Voltage)
OK:
A waveform such as the one shown on P.23-45 (Inspection
Procedure Using an Oscilloscope) is output (flalshing
between 0 ¨ 5V) and there is no noise appearing
in the waveform.
NG
Replace the input shaft speed sensor.
Check the trouble symptoms.
NG
A/T overhaul L
D Replace the underdrive clutch retainer.
Check the trouble symptoms.
NG
Eliminate the cause of the noise.
OK
Measure output waveform from the output shaft speed sensor.
(using an oscilloscope)
D Connect the connector B-68 and measure voltage between
32 and 43 at the A/T-ECU.
D Engine: 2,000 r/min (approx. 50 km/h)
D Selector lever position: 3
(Voltage)
OK:
A waveform such as the one shown on P.23-45 (Inspection
Procedure Using an Oscilloscope) is output (flalshing
between 0 ¨ 5V) and there is no noise appearing
in the waveform.
NG
Replace the output shaft speed sensor.
Check the trouble symptoms.
NG
A/T overhaul L
D Replace the transfer drive gear and driven gear.
Check the trouble symptoms.
NG
Eliminate the cause of the noise.
OK
A/T overhaul L
D Underdrive clutch system check
(No. 41, No. 42, or no diagnosis code is output).
D Overdrive clutch system check
(No. 4 4 or no diagnosis code is output).