DTC P0335: Crankshaft Position Sensor Circuit

CIRCUIT OPERATION

The crankshaft position sensor power is supplied from the ECM (terminal No. 9).
Terminal No. 2 of the crankshaft position sensor is grounded with ECM (terminal No. 24).
A 5-volt voltage is applied on the crankshaft position sensor output terminal (terminal No. 3) from the ECM (terminal No. 8). The crankshaft position sensor generates a pulse signal when the output terminal is opened and grounded.

TECHNICAL DESCRIPTION

The crankshaft position sensor detects the crank angle (position) of each cylinder, and converts that data to pulse signals, then which are input to the ECM.
When the engine is running, the crankshaft position sensor outputs a pulse signal.
The ECM checks whether pulse signal is input while the engine is cranking.

DESCRIPTIONS OF MONITOR METHODS

Crankshaft position sensor signal does not change.
Crankshaft position sensor signal is not normal pattern.

MONITOR EXECUTION

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)

Not applicable

Sensor (The sensor below is determined to be normal)

Not applicable

DTC SET CONDITIONS <Circuit continuity>

Logic Flow Chart

Check Condition

Engine is being cranked.

Engine speed is higher than 500 r/min excluding during cranking.

Judgement Criterion

Crankshaft position sensor output voltage has not changed (no pulse signal is input) for 2 seconds.

DTC SET CONDITIONS <Range/Performance problem - alignment>

Logic Flow Chart

Check Condition

Engine is being cranked.

Engine speed is higher than 500 r/min excluding during cranking.

Judgement Criterion

Normal signal pattern has not been input for cylinder identification from the crankshaft position sensor signal and camshaft position sensor signal for 2 seconds.

OBD-II DRIVE CYCLE PATTERN

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)

Crankshaft position sensor failed.
Open or shorted crankshaft position sensor circuit, or harness damage, or connector damage.
Crankshaft position sensing ring failed
ECM failed.

DIAGNOSIS

Required Special Tools:

MB991958: Scan Tool (M.U.T.-III Sub Assembly)

MB991824: V.C.I.
MB991827: USB Cable
MB991910: Main Harness A

MB991709: Test Harness
MB992110: Power Plant ECU Check Harness

STEP 1. Using scan tool MB991958, check data list item 2: Crankshaft Position Sensor.

caution

To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

(1)Connect scan tool MB991958 to the data link connector.
(2)Start the engine and run at idle.
(3)Set scan tool MB991958 to the data reading mode for item 2, Crankshaft Position Sensor.

The tachometer and engine speed indicated on the scan tool should match.

(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the sensor operating properly?

It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions

Go to Step 2.

STEP 2. Using the oscilloscope, check the crankshaft position sensor.

(1)Disconnect the crankshaft position sensor connector B-105 and connect the test harness special tool (MB991709) between the separated connectors.

(2)Connect the oscilloscope probe to terminal No. 3 of the crankshaft position sensor connector.

note

When measuring with the ECM side connector, disconnect all ECM connectors. Connect the check harness special tool (MB992110) between the separated connectors. Then connect the oscilloscope probe to the check harness connector terminal No. 8.

(3)Start the engine and run at idle.

(4)Check the waveform.

The waveform should show a pattern similar to the illustration.

(5)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the waveform normal?

Go to Step 3.

Go to Step 5.

STEP 3. Check harness connector B-105 at the crankshaft position sensor and harness connector B-108 at ECM for damage.

Q. Is the harness connector in good condition?

	Go to Step 4.

	Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 20.

STEP 4. Using scan tool MB991958, check data list item 2: Crankshaft Position Sensor.

(1)Start the engine and run at idle.
(2)Set scan tool MB991958 to the data reading mode for item 2, Crankshaft Position Sensor.

The tachometer and engine speed indicated on the scan tool should match.

(3)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the sensor operating properly?

It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions

Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, Diagnosis - ID Code Registration Judgment Table <Vehicles with KOS>

or GROUP 42C, Diagnosis - ID Codes Registration Judgment Table <Vehicles with WCM>

. Then go to Step 20.

STEP 5. Check harness connector B-105 at the crankshaft position sensor for damage.

Q. Is the harness connector in good condition?

	Go to Step 6.

	Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 20.

STEP 6. Measure the sensor supply voltage at crankshaft position sensor harness side connector B-105.

(1)Disconnect the connector B-105 and measure at the harness side.

(2)Turn the ignition switch to the "ON" position.

(3)Measure the voltage between terminal No. 3 and ground.

Voltage should be between 4.9 and 5.1 volts.

(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the measured voltage between 4.9 and 5.1 volts?

Go to Step 10.

Go to Step 7.

STEP 7. Check harness connector B-108 at ECM for damage.

Q. Is the harness connector in good condition?

	Go to Step 8.

	Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 20.

STEP 8. Measure the sensor supply voltage at ECM connector B-108 by using power plant ECU check harness special tool MB992110.

(1)Disconnect all ECM connectors. Connect the power plant ECU check harness special tool MB992110 between the separated connectors.
(2)Disconnect the crankshaft position sensor connector B-105.
(3)Turn the ignition switch to the "ON" position.

(4)Measure the voltage between terminal No. 8 and ground.

Voltage should be between 4.9 and 5.1 volts.

(5)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the measured voltage between 4.9 and 5.1 volts?

Repair harness wire between crankshaft position sensor connector B-105 (terminal No. 3) and ECM connector B-108 (terminal No. 8) because of open circuit. Then go to Step 20.

Go to Step 9.

STEP 9. Check for short circuit to ground between crankshaft position sensor connector B-105 (terminal No. 3) and ECM connector B-108 (terminal No. 8).

Q. Is the harness wire in good condition?

	Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, Diagnosis - ID Code Registration Judgment Table <Vehicles with KOS> or GROUP 42C, Diagnosis - ID Codes Registration Judgment Table <Vehicles with WCM> . Then go to Step 20.

	Repair it. Then go to Step 20.

STEP 10. Measure the power supply voltage at crankshaft position sensor harness side connector B-105.

(1)Disconnect the connector B-105 and measure at the harness side.

(2)Turn the ignition switch to the "ON" position.

(3)Measure the voltage between terminal No. 1 and ground.

Voltage should be between 4.9 and 16.0 volts.

(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the measured voltage between 4.9 and 16.0 volts?

Go to Step 13.

Go to Step 11.

STEP 11. Check harness connector B-108 at ECM for damage.

Q. Is the harness connector in good condition?

	Go to Step 12.

	Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 20.

STEP 12. Check for open circuit and short circuit to ground between crankshaft position sensor connector B-105 (terminal No. 1) and ECM connector B-108 (terminal No. 9).

Q. Is the harness wire in good condition?

	Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, Diagnosis - ID Code Registration Judgment Table <Vehicles with KOS> or GROUP 42C, Diagnosis - ID Codes Registration Judgment Table <Vehicles with WCM> . Then go to Step 20.

	Repair it. Then go to Step 20.

STEP 13. Check the continuity at crankshaft position sensor harness side connector B-105.

(1)Disconnect the connector B-105 and measure at the harness side.

(2)Check for the continuity between terminal No. 2 and ground.

Continuity (2 Ω or less)

Q. Does continuity exist?

Go to Step 16.

Go to Step 14.

STEP 14. Check harness connector B-108 at ECM for damage.

Q. Is the harness connector in good condition?

	Go to Step 15.

	Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 20.

STEP 15. Check for open circuit and harness damage between crankshaft position sensor connector B-105 (terminal No. 2) and ECM connector B-108 (terminal No. 24).

Q. Is the harness wire in good condition?

	Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, Diagnosis - ID Code Registration Judgment Table <Vehicles with KOS> or GROUP 42C, Diagnosis - ID Codes Registration Judgment Table <Vehicles with WCM> . Then go to Step 20.

	Repair it. Then go to Step 20.

STEP 16. Check harness connector B-108 at ECM for damage.

Q. Is the harness connector in good condition?

	Go to Step 17.

	Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 20.

STEP 17. Check for harness damage between ECM connector B-108 (terminal No. 9) and crankshaft position sensor connector B-105 (terminal No. 1).

Q. Is the harness wire in good condition?

	Go to Step 18.

	Repair it. Then go to Step 20.

STEP 18. Check for harness damage between crankshaft position sensor connector B-105 (terminal No. 3) and ECM connector B-108 (terminal No. 8).

Q. Is the harness wire in good condition?

	Go to Step 19.

	Repair it. Then go to Step 20.

STEP 19. Check the crankshaft position sensing ring.

Q. Is the crankshaft position sensing ring in good condition?

	Replace the crankhaft position sensor. Then go to Step 20.

	Replace the crankshaft sensing ring. Then go to Step 20.

STEP 20. Test the OBD-II drive cycle.

(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23

(2)Check the diagnostic trouble code (DTC).

Q. Is DTC P0335 set?

	Retry the troubleshooting.

	The inspection is complete.