Code No.P1766 (P0715): Input shaft speed sensor system
OPERATION
The input shaft speed sensor detects the speed of the
reverse clutch retainer, and sends the information to the ECU as a pulse
signal.
DIAGNOSIS CODE SET CONDITIONS
The diagnosis code No.P1766 (P0715)
is set if the input shaft speed sensor does not send a pulse signal for one
second or more while the 3rd gears are engaged and the vehicle speed is 40
km/h or more (the output shaft speed sensor speed is 1,000 r/min
or more).
If the code No.P1766 (P0715) 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 input shaft speed sensor
- Malfunction of reverse clutch retainer
- Damaged harness wires and connectors
- Malfunction of the A/T-ECU <4M4>
- Malfunction of the engine-A/T-ECU <6G7>
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STEP 1. M.U.T.-III data list
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Item 5: Input 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: C-01 input shaft speed sensor
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 3.
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Repair
the defective connector.
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STEP 3. Measure the resistance at input shaft speed sensor connector
C-01.
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Disconnect the connector, and measure the
resistance between terminal 1 and earth at the wiring harness
side.
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OK: Continuity (Less than 2
Ω)
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Q.
Is the check result normal?
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Go to Step 9.
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Go to Step 4.
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STEP 4. Measure the voltage at A/T-ECU connector D-38
<4M4> or engine-A/T-ECU connector D-216
<6G7>.
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(1)Connect input shaft speed sensor connector C-01.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between A/T-ECU connector D-38
terminal No.43 <4M4> and earth or engine-A/T-ECU connector
D-216 terminal No.88 <6G7> and earth. OK: 0.5 V or
less
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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 5.
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STEP 5. Connector check: D-38 A/T-ECU connector <4M4>
or D-216 engine-A/T-ECU connector <6G7>
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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 6.
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Repair
the defective connector.
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STEP 6. M.U.T.-III data list
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Item 5: Input 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 A/T-ECU
<4M4> or engine-A/T-ECU <6G7>.
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STEP 7. Connector check: D-225 intermediate connector, D-111 J/C (5)
<6G7>, D-38 A/T-ECU connector <4M4> or D-216
engine-A/T-ECU connector <6G7>
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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 input shaft speed sensor connector
C-01 terminal No.1 and A/T-ECU connector D-38 terminal No.43
<4M4> or engine-A/T-ECU connector D-216 terminal No.88
<6G7>.
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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 6.
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Repair
the wiring harness.
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STEP 9. Measure the voltage at input shaft speed sensor connector
C-01.
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(1)Disconnect the connector, and measure the voltage between
terminal 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 12.
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Go to Step 10.
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STEP 10. Connectors check: D-401 J/B connector, D-225 and 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 11.
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Repair
the defective connector.
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STEP 11. Check the harness between input shaft speed sensor connector
C-01 terminal No.3 and junction block 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 6.
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Repair
the wiring harness.
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STEP 12. Measure the voltage at input shaft speed sensor connector
C-01.
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(1)Disconnect the connector, and measure the voltage between
terminal 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 18.
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Go to Step 13.
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STEP 13. Measure the voltage at A/T-ECU connector D-38
<4M4> or engine-A/T-ECU connector D-216
<6G7>.
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(1)Disconnect input shaft speed sensor connector
C-01.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between A/T-ECU connector D-38
terminal No.31 <4M4> and earth or engine-A/T-ECU connector
D-216 terminal No.64 <6G7> 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 16.
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Go to Step 14.
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STEP 14. Connector check: D-225 intermediate connector, D-111 J/C (5)
<6G7>, D-38 A/T-ECU connector <4M4> or D-216
engine-A/T-ECU connector <6G7>
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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 15.
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Repair
the defective connector.
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STEP 15. Check the harness between input shaft speed sensor connector
C-01 terminal No.2 and A/T-ECU connector D-38 terminal No.31
<4M4> or engine-A/T-ECU connector D-216 terminal No.64
<6G7>.
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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 6.
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Repair
the wiring harness.
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STEP 16. Connector check: D-225 intermediate connector, D-111 J/C (5)
<6G7>, D-38 A/T-ECU connector <4M4> or D-216
engine-A/T-ECU connector <6G7>
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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 17.
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Repair
the defective connector.
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STEP 17. Check the harness between input shaft speed sensor connector
C-01 terminal No.2 and A/T-ECU connector D-38 terminal No.31
<4M4> or engine-A/T-ECU connector D-216 terminal No.64
<6G7>.
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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 6.
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Repair
the wiring harness.
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STEP 18. Measure the output wave pattern of the input shaft speed
sensor at A/T-ECU connector D-38 <4M4> or engine-A/T-ECU
connector D-216 <6G7> (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
A/T-ECU connector D-38 terminal No.31 <4M4> and earth or
engine-A/T-ECU connector D-216 terminal No.64 <6G7> 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.
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 19.
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STEP 19. Connector check: D-38 A/T-ECU connector <4M4> or
D-216 engine-A/T-ECU connector <6G7>
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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 20.
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Repair
the defective connector.
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STEP 20. Replace the input shaft speed sensor and then recheck the
diagnosis code.
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(1)Replace the input 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 P1766 (P0715) set?
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Go to Step 21.
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The
inspection is complete.
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STEP 21. Reverse clutch retainer inspection
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Visually check the reverse clutch retainer 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 reverse clutch
retainer.
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