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DTC P0340: camshaft position sensor Circuit
 
 
 
 
CIRCUIT OPERATION
  • The camshaft position sensor power is supplied from the ECM terminal 5V.
  • Ground terminal of the camshaft position sensor is grounded with ECM terminal DGND.
  • A 5-volt voltage is applied on the camshaft position sensor output terminal from the ECM terminal SGC. The camshaft position sensor generates a pulse signal when the output terminal is opened and grounded.
 
 
TECHNICAL DESCRIPTION
  • The camshaft position sensor detects the position of the intake camshaft and inputs the pulse signal to the ECM.
  • In response to the camshaft position sensor signal and the crankshaft sensor signal, the ECM detects the compression top dead center of the No. 1 cylinder.
  • Also, in response to the camshaft position sensor signal, the ECM controls variable valve timing (V.V.T.).
 
 
DESCRIPTIONS OF MONITOR METHODS
  • camshaft position sensor signal does not change.
  • camshaft position sensor signal is not normal pattern.
 
 
MONITOR EXECUTION
  • Continuous
 
 
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.
or
  • Engine speed is more than 500 r/min excluding during cranking.
Judgment Criterion
  • camshaft position sensor output voltage does not change (no pulse signal is input) for 2 seconds.
 
 
DTC SET CONDITIONS <Range/Performance problem - alignment>
Logic Flow Chart
Check Condition
  • Engine is being cranked.
or
  • Engine speed is more than 500 r/min excluding during cranking.
Judgment Criterion
  • Normal signal pattern is not inputted for cylinder identification from the crankshaft position sensor signal and camshaft position sensor signal for 2 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Engine runs in learned pattern until engine stops.
  • Does not control variable valve timing (V.V.T.).
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 22 .
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be stored are:)
  • camshaft position sensor failed.
  • Open or shorted camshaft position sensor circuit, harness damage or connector damage.
  • Intake camshaft failed.
  • ECM failed.

 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)
    • MB991824: Vehicles Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
  • MB991709: Test Harness
STEP 1. Using the oscilloscope, check the camshaft position sensor.
(1) Disconnect the camshaft position sensor connector, and connect test harness special tool MB991709 between the separated connectors. (All terminals should be connected.)
(2) Connect the oscilloscope probe to the camshaft position sensor side connector terminal SGC.
noteWhen checking with the ECM side connector, connect the oscilloscope probe to the ECM connector terminal SGC by backprobing.
(3) Start the engine and run at idle.
(4) Check the wave pattern.
  • The wave pattern should show a pattern similar to the illustration.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Is the wave pattern normal?
Go to Step 12.
Go to Step 2.
 
STEP 2. Measure the sensor supply voltage at camshaft position sensor harness side connector.
(1) Disconnect the connector and measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal SGC line and ground.
  • Voltage should be between 4.9 and 5.1 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 4.9 and 5.1 volts?
Go to Step 5.
Go to Step 3.
 
STEP 3. Measure the sensor supply voltage at ECM connector by backprobing.
(1) Do not disconnect the connector.
(2) Disconnect the camshaft position sensor connector.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal SGC and ground by backprobing.
  • Voltage should be between 4.9 and 5.1 volts.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 4.9 and 5.1 volts?
Repair or replace the connector(s), or check and repair the harness of open circuit in SGC line between camshaft position sensor connector and ECM connector. Then go to Step 13 .
Go to Step 4.
 
STEP 4. Check of short circuit to ground in SGC line between camshaft position sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 12.
Repair the connector(s) or wiring harness. Then go to Step 13.
 
STEP 5. Measure the sensor supply voltage at camshaft position sensor harness side connector.
(1) Disconnect the connector and measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 5V line and ground.
  • Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 4.9 and 5.1 volts? present?
Go to Step 7.
Go to Step 6.
 
STEP 6. Check of open circuit and short circuit to ground in 5V line between camshaft position sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 12.
Repair the connector(s) or wiring harness. Then go to Step 13.
 
STEP 7. Check the continuity at camshaft position sensor harness side connector.
(1) Disconnect the connector and measure at the harness side.
(2) Check for the continuity between terminal DGND line and ground.
  • Continuity (2 ohms or less).
Does continuity exist?
Go to Step 9.
Go to Step 8.
 
STEP 8. Check of open circuit and harness damage in DGND line between camshaft position sensor connector and ECM connector B-26.
Is the harness wire in good condition?
Go to Step 12.
Repair it. Then go to Step 13.
 
STEP 9. Check of harness damage in 5V line between ECM connector and camshaft position sensor connector.
Is the harness wire in good condition?
Go to Step 10.
Repair the connector(s) or wiring harness. Then go to Step 13.
 
STEP 10. Check of harness damage in SGC line between camshaft position sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 11.
Repair it. Then go to Step 13.
 
STEP 11. Check the intake camshaft position sensing portion.
Is the intake camshaft position sensing portion in good condition?
Replace the camshaft position sensor. Then go to Step 13.
Replace the intake camshaft. Then go to Step 13.
 
STEP 12. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 22 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P0340 stored?
Replace the ECM (Refer to, Removal and Installation ). Then go to Step 13.
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 .
 
STEP 13. 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 22 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P0340 stored?
Retry the troubleshooting.
The inspection is complete.