Code No. P0335: Crank Angle Sensor System


OPERATION



  • A power voltage of 5 V is applied to the crank angle sensor power terminal from the engine-ECU connector terminal SGTB and earthed to engine-ECU connector terminal SGTG from the crank angle sensor connector terminal.
  • The sensor signal is inputted to the engine-ECU connector terminal SGT from the crank angle sensor output terminal.

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. Perform voltage measurement at crank angle sensor connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal engine-ECU SGT line and body earth.
OK: 4.9 - 5.1 V

Q. Is the check result normal?
Go to Step 6.
Go to Step 3.

STEP 3. Perform voltage measurement at engine-ECU connector.

  • Disconnect engine-ECU harness, and connect special tool power plant ECU check harness (MB992291) to measure at connector for inspection.
  • Disconnect crank angle sensor connector.
  • Ignition switch: ON
  • Voltage between terminal SGT and body earth.
OK: 4.9 - 5.1 V

Q. Is the check result normal?

    Repair or replace the connector, or check and repair harness between crank angle sensor connector terminal and engine-ECU connector terminal SGT.

    • Check output line for open circuit.
Go to Step 4.

STEP 4. Check harness between crank angle sensor connector terminal and engine-ECU connector terminal SGT.

  • Check output line for short circuit.

Q. Is the check result normal?
Go to Step 5.
Repair or replace the connector, or repair the damaged harness wire.

STEP 5. 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 6. Perform voltage measurement at 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 engine-ECU SGTB line and body earth.
OK: 4.9 - 5.1 V

Q. Is the check result normal?
Go to Step 8.
Go to Step 7.

STEP 7. Check harness between crank angle sensor connector terminal and engine-ECU connector terminal SGTB.

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

Q. Is the check result normal?
Go to Step 5.
Repair or replace the connector, or repair the damaged harness wire.

STEP 8. Perform resistance measurement at crank angle sensor connector.

  • Disconnect connector, and measure at harness side.
  • Resistance between terminal engine-ECU SGTG line and body earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?
Go to Step 10.
Go to Step 9.

STEP 9. Check harness between crank angle sensor connector terminal and engine-ECU connector terminal SGTG.

  • Check earthing line for open circuit and damage.

Q. Is the check result normal?
Go to Step 5.
Repair or replace the connector, or repair the damaged harness wire.

STEP 10. Check harness between crank angle sensor connector terminal and engine-ECU connector terminal SGT.

  • Check output line for damage.

Q. Is the check result normal?
Go to Step 11.
Repair or replace the connector, or repair the damaged harness wire.

STEP 11. Perform output wave pattern measurement at 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 engine-ECU SGT line and body 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 5.
Go to Step 12.

STEP 12. Check crank angle sensor for correct mounting condition.

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

STEP 13. 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 14.
Check end.

STEP 14. 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 ).