Code No.24, 25: Rear propeller shaft speed sensor system
OPERATION
- The rear propeller shaft speed sensor generates 0 <=> 5
V pulse signal when the rear propeller shaft rotates. The pulse signal
frequency increases with a rise in rear propeller shaft speed.
- The ear propeller shaft speed sensor is connected to the transfer-ECU
(terminals No.9 and No.18) via the rear propeller shaft speed sensor
connector (terminals No.1 and No.2).
- The transfer-ECU detects the rear propeller shaft speed by the signal
input to terminal No.9.
- The rear propeller shaft speed sensor generates the pulse signal as the
hole in the rear output shaft pass the magnetic tip of the sensor.
DIAGNOSIS CODE SET CONDITIONS
In the case that the input signal
from the rear propeller shaft speed sensor is unstable when the APS voltage is
1.5 V and over, the code No.24 is set as the open circuit or the short circuit
of the rear propeller shaft speed sensor.
In the case that the input signal
from the rear propeller shaft speed sensor is unstable when the freewheel
engage switch is ON condition, the code No.25 is set as the open circuit or
the short circuit of the rear propeller shaft speed sensor.
PROBABLE CAUSES
- Malfunction of the rear propeller shaft speed sensor circuit
- Malfunction of the rear output shaft
- Damaged harness wires and connectors
- Malfunction of the transfer-ECU
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STEP 1. M.U.T.-III data list
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Item 3: Rear propeller 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. Measure the voltage at rear propeller shaft speed sensor
connector C-10.
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(1)Disconnect the connector, and measure the voltage between
terminal No.3 and earth at the wiring harness side.
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(2)Turn the ignition switch to the ON
position.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 3.
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STEP 3. Connector check: D-401 J/B connector, D-225, D-229 intermediate
connector.
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Check for the contact with terminals.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair
the defective connector.
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STEP 4. Check the harness between rear propeller shaft speed sensor
connector C-10 terminal No.3 and J/B connector D-401 terminal
No.12.
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Check the power supply line for short or open
circuit.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair
the wiring harness.
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STEP 5. Measure the voltage at rear propeller shaft speed sensor
connector C-10.
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(1)Disconnect the connector, and measure the voltage between
terminal No.2 and earth at the wiring harness side.
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(2)Turn the ignition switch to the ON
position.
OK: 4.5 - 4.9 V
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Q.
Is the check result normal?
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Go to Step 11.
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Go to Step 6.
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STEP 6. Measure the voltage at transfer-ECU connector
D-124.
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(1)Disconnect rear propeller shaft speed sensor connector
C-10.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between transfer-ECU connector D-124
terminal No.9 and earth.
OK: 4.5 - 4.9 V
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Q.
Is the check result normal?
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Go to Step 7.
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Go to Step 9.
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STEP 7. Connector check: C-10 rear propeller shaft speed sensor
connector, D-124 transfer-ECU connector.
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Check for the contact with terminals.
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Q.
Is the check result normal?
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Go to Step 8.
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Repair
the defective connector.
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STEP 8. Check the harness between rear propeller shaft speed sensor
connector C-10 terminal No.2 and transfer-ECU connector D-124 terminal
No.9.
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Check the output line for open
circuit.
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Q.
Is the check result normal?
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Go to Step 19.
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Repair
the wiring harness.
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STEP 9. Connector check: C-10 rear propeller shaft speed sensor
connector, D-124 transfer-ECU connector.
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Repair the defective connector.
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Q.
Is the check result normal?
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Go to Step 10.
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Repair
the defective connector.
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STEP 10. Check the harness between rear propeller shaft speed sensor
connector C-10 terminal No.2 and transfer-ECU connector D-124 terminal
No.9.
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Check the output line for short
circuit.
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Q.
Is the check result normal?
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Go to Step 11.
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Repair
the wiring harness.
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STEP 11. Measure the resistance at rear propeller shaft speed sensor
connector C-10.
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Disconnect the connector, and measure the
resistance between terminal No.1 and earth at the wiring harness
side.
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OK: Continuity (2 Ω or
less)
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Q.
Is the check result normal?
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Go to Step 16.
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Go to Step 12.
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STEP 12. Measure the resistance at transfer-ECU connector
D-124.
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(1)Do not disconnect rear propeller shaft speed sensor
connector C-10.
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(2)Measure the voltage between transfer-ECU connector D-124
terminal No.18 and earth.
OK:Continuity (2 Ω or
less)
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Q.
Is the check result normal?
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Go to Step 13.
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Go to Step 15.
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STEP 13. Connector check: C-10 rear propeller shaft speed sensor
connector, D-124 transfer-ECU connector.
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Check for the contact with terminals.
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Q.
Is the check result normal?
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Go to Step 14.
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Repair
the defective connector.
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STEP 14. Check the harness between rear propeller shaft speed sensor
connector C-10 terminal No.1 and transfer-ECU connector D-124 terminal
No.18.
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Check the earth line for open circuit.
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Q.
Is the check result normal?
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Go to Step 16.
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Repair
the wiring harness.
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STEP 15. Connector check: D-124 transfer-ECU connector.
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Check for the contact with terminals.
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Q.
Is the check result normal?
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Replace the transfer-ECU.
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Repair
the defective connector.
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STEP 16. Measure the output wave pattern of the rear propeller shaft
speed sensor at transfer-ECU connector D-124 (using an
oscilloscope).
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(1)Start the engine and drive the vehicle at constant speed
of 30 km/h.
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(2)Connect an oscilloscope, and measure the voltage between
transfer-ECU connector D-124 terminal No.9 and No.18.
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(3)Check the rear propeller shaft speed sensor
waveform.
OK: A wave pattern such as the one shown on
(Inspection 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.
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Q.
Is the check result normal?
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Go to Step 19.
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Go to Step 17.
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STEP 17. Replace the rear propeller shaft speed sensor.
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(1)Replace the rear propeller 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 No.24 or No.25 set?
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Go to Step 18.
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The
inspection is complete.
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STEP 18. Replace the sensor rotor.
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(1)Replace the sensor rotor.
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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 No.24 or No.25 set?
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Eliminate the cause of the
noise.
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The
inspection is complete.
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STEP 19. M.U.T.-III data list
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Item 3: Rear propeller 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 transfer-ECU.
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