Code No. P0335: Crank Angle Sensor System


OPERATION



  • A power voltage of 5 V is applied to the crank angle sensor power terminal (terminal No. 1) from the engine-ECU (terminal No. 68) and earthed to engine-ECU (terminal No. 91) from the crank angle sensor (terminal No. 2).
  • The sensor signal is inputted to the engine-ECU (terminal No. 67) from the crank angle sensor output terminal (terminal No. 3).

FUNCTION



  • The crank angle sensor detects the crank angle (position) and inputs a pulse signal to the engine-ECU.
  • In response to the signal, the engine ECU detects the engine speed, controls the fuel injection timing and fuel injection quantity, etc.

TROUBLE JUDGMENT


Check Conditions
  • While engine is being cranked or is running.
  • Battery positive voltage is 6 - 16 V.
Judgment Criterion
  • The number of output pulses from the crank angle sensor per engine rotation is 1 or less.

FAIL-SAFE AND BACKUP FUNCTION



  • The rail pressure is controlled in the range between 50 and 100 MPa.
  • The DPF regeneration is prohibited.
  • The fuel injection amount is restricted (Output restriction).
  • The throttle valve is closed (Fixed opening degree).
  • The EGR control is stopped (fully closed).
  • The open angle of the accelerator pedal is restricted.
  • The AS&G control is prohibited.

PROBABLE CAUSES



  • Failed crank angle sensor
  • Open/short circuit or harness damage in crank angle sensor circuit or loose connector contact
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

  • Refer to Data List Reference Table .

  1. Item 2: Engine revolution

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 2 .

STEP 2. Connector check: B-111 crank angle sensor connector

Q. Is the check result normal?
Go to Step 3 .
Repair or replace the connector.

STEP 3. Perform voltage measurement at B-111 crank angle sensor connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 3 and earth.
OK: 4.9 - 5.1 V

Q. Is the check result normal?
Go to Step 9 .
Go to Step 4 .

STEP 4. Perform voltage measurement at B-09 engine-ECU connector.

  • Disconnect engine-ECU harness, and connect special tool power plant ECU check harness (MB992291) to measure at connector for inspection.
  • Disconnect B-111 crank angle sensor connector.
  • Ignition switch: ON
  • Voltage between terminal No. 67 and earth.
OK: 4.9 - 5.1 V

Q. Is the check result normal?
Go to Step 5 .
Go to Step 6 .

STEP 5. Connector check: B-09 engine-ECU connector

Q. Is the check result normal?

    Check intermediate connector B-114, and repair if necessary. If intermediate connector is normal, check and repair harness between B-111 (terminal No. 3) crank angle sensor connector and B-09 (terminal No. 67) engine-ECU connector.

    • Check output line for open circuit.
Repair or replace the connector.

STEP 6. Connector check: B-09 engine-ECU connector

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

STEP 7. Check harness between B-111 (terminal No. 3) crank angle sensor connector and B-09 (terminal No. 67) engine-ECU connector
note Before checking harness, check intermediate connector B-114, and repair if necessary.

  • Check output line for short circuit.

Q. Is the check result normal?
Go to Step 8 .
Repair the damaged harness wire.

STEP 8. M.U.T.-III data list

  • Refer to Data List Reference Table .

  1. Item 2: Crank angle sensor

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Replace the engine-ECU.

STEP 9. Perform voltage measurement at B-111 crank angle sensor connector.

  • Use special tool test harness (MB991709) to connect connector, and measure at pick-up harness.
  • Ignition switch: ON
  • Voltage between terminal No. 1 and earth.
OK: 4.9 - 5.1 V

Q. Is the check result normal?
Go to Step 12 .
Go to Step 10 .

STEP 10. Connector check: B-09 engine-ECU connector

Q. Is the check result normal?
Go to Step 11 .
Repair or replace the connector.

STEP 11. Check harness between B-111 (terminal No. 1) crank angle sensor connector and B-09 (terminal No. 68) engine-ECU connector
note Before checking harness, check intermediate connector B-114, and repair if necessary.

  • Check power supply line for open/short circuit and damage.

Q. Is the check result normal?
Go to Step 8 .
Repair the damaged harness wire.

STEP 12. Perform resistance measurement at B-111 crank angle sensor connector.

  • Disconnect connector, and measure at harness side.
  • Resistance between terminal No. 2 and earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?
Go to Step 15 .
Go to Step 13 .

STEP 13. Connector check: B-09 engine-ECU connector

Q. Is the check result normal?
Go to Step 14 .
Repair or replace the connector.

STEP 14. Check harness between B-111 (terminal No. 2) crank angle sensor connector and B-09 (terminal No. 91) engine-ECU connector
note Before checking harness, check intermediate connector B-114, and repair if necessary.

  • Check earthing line for open circuit and damage.

Q. Is the check result normal?
Go to Step 8 .
Repair the damaged harness wire.

STEP 15. Check harness between B-111 (terminal No. 3) crank angle sensor connector and B-09 (terminal No. 67) engine-ECU connector
note Before checking harness, check intermediate connector B-114, and repair if necessary.

  • Check output line for damage.

Q. Is the check result normal?
Go to Step 16 .
Repair the damaged harness wire.

STEP 16. Perform output wave pattern measurement at B-111 crank angle sensor (Using an oscilloscope).

  • Use special tool test harness (MB991709) to connect connector, and measure at pick-up harness.
  • Engine: Idling
  • Transmission: Neutral
  • Voltage between terminal No. 3 and earth.
OK: Waveforms should be displayed on Inspection procedure using an oscilloscope (Refer to ), its maximum value should be 4.8 V or more, and its minimum valve should be 0.6 V or less with no noise in waveform.

Q. Is the check result normal?
Go to Step 8 .
Go to Step 17 .

STEP 17. Check crank angle sensor for correct mounting condition.

Q. Is the check result normal?
Go to Step 18 .
Repair.

STEP 18. Replace the crank angle sensor.

  • After replacing the crank angle sensor, reconfirm whether the diagnosis code is set.

Q. Is the diagnosis code set?
Go to Step 19 .
Check end.

STEP 19. Replace the crankshaft sensing ring.

  • After replacing the crank angle sensor, reconfirm whether the diagnosis code is set.

Q. Is the diagnosis code set?
Replace the engine-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).