Code No. P0715: Input Shaft Speed Sensor System












DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES



  • Malfunction of the Input shaft speed sensor system circuit
  • Damaged harness or connector
  • Malfunction of the Input shaft speed sensor
  • Malfunction of the A/T-ECU
  • Malfunction of the input shaft speed sensor rotor (A/T assembly)

DIAGNOSIS PROCEDURE

STEP 1. Check the A/T-ECU terminal voltage and frequency.
[C-137 A/T-ECU connector (vehicle side, connected)]
Check that the voltage between C-137 terminal No. 49 and C-35 terminal No. 13 or C-35 terminal No. 26 is 0 V, and then check the frequency of C-137 terminal No. 38.

  • At D range, and the engine speed is 700 r/min: Approx. 353 Hz

Q. Is the check result normal?
Go to Step 8.
Go to Step 2.

STEP 2. Check the power supply and sensor earth.
[B-131 input shaft speed sensor connector (vehicle side, disconnected)]

  • With the ignition switch ON: Terminal No. 3 to terminal No. 1 → System voltage

Q. Is the check result normal?
Go to Step 3.
Go to Step 4.

STEP 3. Check the wiring harness between the input shaft speed sensor and A/T-ECU.
Check for continuity between B-131 input shaft speed sensor connector terminals and C-137 A/T-ECU terminals.

  • Between B-131 terminal No. 2 and C-137 terminal No. 38: Continuity exists.
When the continuity check result is OK, check that the wiring harness is not shorted to the body and other wiring harness.

Q. Is the check result normal?
Replace the input shaft speed sensor with the one of the same transmission of the same model. Then go to Step 5 .
Repair or replace the failure section, and then go to Step 8 .

STEP 4. Check the path between the ignition switch and the input shaft speed sensor.

  • Check the wiring harness for an open/short circuit between the ignition switch and B-131 input shaft speed sensor connector terminal No. 3.
  • Check for a blown fuse.

Q. Is the check result normal?
Go to Step 6.
Repair or replace the failure section.

STEP 5. After replacing the input shaft speed sensor, drive the vehicle for a while, and then check the diagnosis code again.

Q. Is the check result normal?
Replace the input shaft speed sensor.
Replace the A/T-ECU.

STEP 6. Check the wiring harness between the input shaft speed sensor and A/T-ECU.
Check for continuity between B-131 input shaft speed sensor terminals and C-137 A/T-ECU terminals.

  • Between B-131 terminal No. 1 and C-137 terminal No. 49: Continuity exists.
When the continuity check result is OK, check that the wiring harness is not shorted to the body and other wiring harness.

Q. Is the check result normal?
Go to Step 7.
Repair or replace the failure section.

STEP 7. Check the A/T-ECU connector pin terminal and the connection status.

Q. Is there a failure point?
Repair or replace the failure section.
Replace the A/T-ECU.

STEP 8. Drive the vehicle for a while.
Check that the normal code is displayed.

Q. Is the check result normal?
The procedure is complete.
Replace the A/T-ECU.