Code
No.23: Output shaft speed sensor system
OPERATION
The output shaft speed sensor detects the speed of
the transfer drive gear, and sends
the information to the engine-A/T-ECU as a pulse signal.
DIAGNOSIS CODE SET CONDITIONS
If the output pulse from the
output shaft speed sensor has been lost for one second or
more while the vehicle is being driven, it is judged that there is an
open circuit or short
circuit in the output shaft speed sensor, and diagnosis code 23 is
set.
If the code No.23 is set four times, the transmission will be
fixed in 3rd gear as a fail-safe
measure. However, the transmission can be downshifted to 2nd gear by
operating the selector
lever.
PROBABLE CAUSES
- Malfunction of output shaft speed sensor
- Malfunction of transfer drive gear or driven gear
- Damaged harness wires and connectors
- Malfunction of the engine-A/T-ECU
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STEP 1. M.U.T.-III data list
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Item 0002: Output shaft speed
sensor (Refer to data list reference table  ).
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Q.
Is the check result normal?
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 Intermittent
malfunction (Refer to GROUP 00 - How to Cope with
Intermittent
Malfunction ).
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 Go to Step
2.
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STEP 2. Connector check: B-108 output shaft speed sensor
connector
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Check for the contact with
terminals.
Q.
Is the check result normal?
Go to Step
3.
Repair
the defective connector.
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STEP 3. Measure the resistance at output shaft speed
sensor connector
B-108.
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Disconnect the connector, and
measure the resistance between terminal 1 and earth at the
wiring harness side.
OK: 2 Ω or
less
Q.
Is the check result normal?
Go to Step
9.
Go to Step
4.
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STEP 4. Measure the voltage at engine-A/T-ECU
connector C-112.
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(1)Connect output shaft speed sensor connector
B-108.
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(2)Turn the ignition switch to the ON
position.
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(3)Measure the voltage between
engine-A/T-ECU connector C-112 terminal No.88 and
earth.
OK: 0.5 V or less
Q.
Is the check result normal?
Go to Step
7.
Go to Step
5.
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STEP 5. Connector check: C-112 engine-A/T-ECU
connector
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Check for the contact with
terminals.
Q.
Is the check result normal?
Go to Step
6.
Repair
the defective connector.
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STEP 6. M.U.T.-III data list
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Item 0002: Output shaft speed
sensor (Refer to data list reference table ).
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Q.
Is the check result normal?
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Intermittent
malfunction (Refer to GROUP 00 - How to Cope with
Intermittent
Malfunction ).
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Replace the
engine-A/T-ECU.
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STEP 7. Connector check: C-112 engine-A/T-ECU
connector,
C-116 J/C (4)
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Check for the contact with
terminals.
Q.
Is the check result normal?
Go to Step
8.
Repair
the defective connector.
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STEP 8. Check the harness between output shaft speed
sensor connector
B-108 terminal No.1 and engine-A/T-ECU connector
C-112 terminal No.88.
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Check the earth line for open
circuit.
Q.
Is the check result normal?
Go to Step
6.
Repair
the wiring harness.
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STEP 9. Measure the voltage at output shaft speed sensor
connector
B-108.
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(1)Disconnect the connector, and
measure the voltage between terminal 3 and earth at the
wiring harness side.
(2)Turn the ignition switch to the
ON position.
OK: System voltage
Q.
Is the check result normal?
Go to Step
12.
Go to Step
10.
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STEP 10. Connectors check: C-203 J/B connector,
C-18 intermediate
connector, C-116 J/C (4), C-51 J/C (13)
<Vehicles for Hong Kong and
Singapore>
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Check for the contact with
terminals.
Q.
Is the check result normal?
Go to Step
11.
Repair
the defective connector.
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STEP 11. Check the harness between output shaft speed
sensor connector
B-108 terminal No.3 and junction block connector C-203
terminal No.12.
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Check the power supply line for
short or open circuit.
Q.
Is the check result normal?
Go to Step
6.
Repair
the wiring harness.
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STEP 12. Measure the voltage at output shaft speed
sensor connector
B-108.
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(1)Disconnect the connector, and
measure the voltage between terminal 2 and earth at the
wiring harness side.
(2)Turn the ignition switch to the
ON position.
OK: 4.9 - 5.1
V
Q.
Is the check result normal?
Go to Step
18.
Go to Step
13.
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STEP 13. Measure the voltage at engine-A/T-ECU
connector
C-112.
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(1)Disconnect output shaft speed sensor connector
B-108.
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(2)Turn the ignition switch to the ON
position.
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(3)Measure the voltage between
engine-A/T-ECU connector C-112 terminal No.73 and
earth.
OK: 4.9 - 5.1 V
Q.
Is the check result normal?
Go to Step
16.
Go to Step
14.
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STEP 14. Connector check: C-112 engine-A/T-ECU
connector
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Check for the contact with
terminals.
Q.
Is the check result normal?
Go to Step
15.
Repair
the defective connector.
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STEP 15. Check the harness between output shaft speed
sensor connector
B-108 terminal No.2 and engine-A/T-ECU connector
C-112 terminal No.73.
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Check the output line for short
circuit.
Q.
Is the check result normal?
Go to Step
6.
Repair
the wiring harness.
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STEP 16. Connector check: C-112 engine-A/T-ECU
connector
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Check for the contact with
terminals.
Q.
Is the check result normal?
Go to Step
17.
Repair
the defective connector.
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STEP 17. Check the harness between output shaft speed
sensor connector
B-108 terminal No.2 and engine-A/T-ECU connector
C-112 terminal No.73.
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Check the output line for open
circuit.
Q.
Is the check result normal?
Go to Step
6.
Repair
the wiring harness.
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STEP 18. Measure the output wave pattern of the output
shaft speed
sensor at engine-A/T-ECU connector C-112 (using an
oscilloscope).
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(1)Shift the selector lever to the D range.
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(2)Accelerate the vehicle to approximately 50
km/h (shift range; 3rd).
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(3)Connect an oscilloscope, and
measure the voltage between engine-A/T-ECU connector
C-112 terminal No.73 and earth.
OK: A wave
pattern such as the one shown on (Check
Procedure Using an Oscilloscope) should be output, and
the maximum value should be 4.8 V or
more and the minimum value should be 0.8 V or less.
There should be no noise in the output wave
pattern.
Q.
Is the check result normal?
Go to Step
6.
Go to Step
19.
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STEP 19. Connector check: C-112 engine-A/T-ECU
connector
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Check for the contact with
terminals.
Q.
Is the check result normal?
Go to Step
20.
Repair
the defective connector.
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STEP 20. Replace the output shaft speed sensor and then
recheck the
diagnosis code.
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(1)Replace the output shaft speed sensor.
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(2)Test drive the vehicle.
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(3)Check if the diagnosis code is set.
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Q.
Is diagnosis code 23 set?
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Go to Step
21.
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The inspection is
complete.
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STEP 21. Check the transfer drive gear and driven
gear.
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Visually check the transfer drive
gear and driven gear for damage.
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Q.
Is the check result normal?
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Eliminate the cause
of the noise.
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Replace the transfer
drive gear and driven gear.
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