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P0335

Crankshaft Position Sensor Circuit:




Connector: C-40:






CIRCUIT OPERATION
- The crankshaft position sensor power is supplied from the MFI relay (terminal 1), and the ground is provided on the vehicle body.
- A 5-volt voltage is applied on the crankshaft position sensor output terminal (terminal 2) from the PCM (terminal 45). The crankshaft position sensor generates a pulse signal when the output terminal is opened and grounded.

TECHNICAL DESCRIPTION
- The crankshaft position sensor functions to detect the crank angle (position) of each cylinder, and to convert that data to pulse signals, which are then input to the PCM.
- When the engine is running, the crankshaft position sensor outputs a pulse signal.
- The PCM checks whether pulse signal is input while the engine is cranking.

DTC SET CONDITIONS

Check Conditions
- Engine is being cranked.

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

Check Conditions, Judgment Criteria
- Normal signal pattern has not been input for cylinder identification from the crankshaft position sensor signal and camshaft position sensor signal for 2 seconds.

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 loose connector.
- PCM failed.

DIAGNOSIS
Required Special Tools:
MB991502: Scan Tool (MUT-II)
MD998478: Test Harness

STEP 1. Check the crankshaft position sensor in one of the following two ways.
1. Using scan tool MB991502, go to Step 2.
2. Using an oscilloscope, go to Step 3.

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) Position before connecting or disconnecting scan tool MB991502.




STEP 2. Using scan tool MB991502, check data list item 22: Crankshaft Position Sensor.
1. Connect scan tool MB991502 to the data link connector.
2. Start the engine and run at idle.
3. Set scan tool MB991502 to the data reading mode for item 22, Crankshaft Position Sensor.
- The tachometer and engine speed indicated on the scan tool should match.

If they do not match, go to Step 4.

If they match, this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.




STEP 3. Using the oscilloscope, check the crankshaft position sensor.
1. Disconnect crankshaft position sensor connector B-20, and connect the test harness special tool (MD998478) in between.
2. Connect the oscilloscope probe to crankshaft position sensor side connector terminal 2. (black clip on the special tool.)

NOTE: When measuring with the PCM side connector, connect an oscilloscope probe to terminal 45.

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 "LOCK" (OFF) position.

If the waveform does not show a normal pattern, go to Step 4.

If the waveform shows a normal pattern, this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.




STEP 4. Check the power supply line at crankshaft position sensor connector B-20.
1. Disconnect connector B-20 and measure at the harness side.
2. Turn the ignition switch to "ON" position.
3. Measure voltage between terminal 3 and ground.
- Voltage should be battery positive voltage.

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

If within specifications, go to Step 5.

If not within specifications, repair the harness wire between the MFI relay connector A-21X and the crankshaft position sensor connector B-20. Then go to Step 10.




STEP 5. Check the ground line at the crankshaft position sensor connector B-20.
1. Disconnect connector B-20 and measure at the harness side.
2. Check for continuity between terminal 1 and ground.
- Should be less than 2 Ohms.

If less than 2 Ohms, go to Step 6.

If open circuit, repair the wire between the crankshaft position sensor connector B-20 and ground. Then go to Step 10.




STEP 6. Check the output line at the crankshaft position sensor connector B-20.
1. Disconnect connector B-20 and measure at the harness side.
2. Turn the ignition switch to "ON" position.
3. Measure voltage between terminal 2 and ground.
- Voltage should be between 4.8 and 5.2 volts

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

If within specifications, go to Step 7.

If not within specifications, go to Step 8.




STEP 7. Check the harness connector B-20 at the crankshaft position sensor for damage.
If harness connector B-20 is damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 10.

If harness connector B-20 is in good condition, replace the crankshaft position sensor. Then go to Step 10.




STEP 8. Check the harness connector C-40 at the PCM for damage.
If harness connector C-40 is damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 10.

If harness connector C-40 is in good condition, go to Step 9.







STEP 9. Check the harness wire between the crankshaft position sensor connector B-20 and the PCM connector C-40.
If the wire between the crankshaft position sensor connector B-20 and the PCM connector C-40 is not damaged, replace the PCM. Then go to Step 10.

If the wire between the crankshaft position sensor connector B-20 and the PCM connector C-40 is damaged, repair it.

Then go to Step 10.

STEP 10. Test the OBD-II drive cycle
1. Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 - Other Monitor.
2. Read the diagnostic trouble code, and confirm that diagnostic trouble code P0335 does not reset.
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