Code No.C1453: Rear Propeller Shaft Speed Sensor System (Abnormal)
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.13 and No.30) via the rear propeller shaft speed sensor connector (terminals No.2 and No.1).
The transfer-ECU detects the rear propeller shaft speed by the signal input to terminal No.13.
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.C1453 is set.
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.C1453 is set.
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
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
Item 13: Rear propeller shaft speed sensor (Refer to data list reference table ).
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Go to Step 2.
STEP 2. Measure the voltage at rear propeller shaft speed sensor connector C-10.
(1)Disconnect the connector, and measure the voltage between terminal No.3 and earth at the wiring harness side.
(2)Turn the ignition switch to the ON position. OK: System voltage
STEP 16. Measure the output wave pattern of the rear propeller shaft speed sensor at transfer-ECU connector D-124 (using an oscilloscope).
(1)Transfer shift lever position: 4HLc.
(2)Start the engine and drive the vehicle at constant speed of 30 km/h.
(3)Connect an oscilloscope, and measure the voltage between transfer-ECU connector D-124 terminal No.13 and No.30.
(4)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 0.6 V or less. There should be no noise in the output wave pattern.
Q.
Is the check result normal?
Go to Step 19.
Go to Step 17.
STEP 17. Check the rear propeller shaft speed sensor and then recheck the diagnosis code
(1)Remove the rear propeller shaft speed sensor. Wipe any metallic particles or dirt off the sensor tip. If the rear propeller shaft speed sensor has damage, replace the sensor.
(2)Install the rear propeller shaft speed sensor and road test the vehicle.
(3)Check if the diagnosis code is set.
Q.
Is diagnosis code No.C1453 set?
Go to Step 18.
The inspection is complete.
STEP 18. Rear output shaft check
Visually check the rear output shaft for damage.
Q.
Is the check result normal?
Investigate noise source, and resolve it.
Replace the rear output shaft.
STEP 19. M.U.T.-III data list
Item 13: Rear propeller shaft speed sensor (Refer to data list reference table ).
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction 
Go to Step 2.