P0340
DTC P0340 CAMSHAFT POSITION SENSOR A CIRCUIT MALFUNCTION (BANK 1 OR SINGLE SENSOR)Component Location:
GENERAL DESCRIPTION
The Camshaft Position Sensor (CMPS) is a sensor that detects the compression TDC of the NO.1 cylinder. The CMPS consists of a hall type sensor and a target on the end of the intake camshaft. When the target triggers the sensor, the sensor voltage is 5 V. If not, the sensor voltage is 0 V. These CMPS signal is sent to the ECM and the ECM uses the CMPS signal for synchronizing the firing of sequential fuel injectors.
DTC DESCRIPTION
The ECM monitors the camshaft sensor signal transition position which must change only once per crankshaft revolution.
If no camshaft signal is detected while crankshaft signal's detected, the ECM sets DTC P0340.
DTC Detecting Condition:
Schematic Diagram:
Signal Waveform And Data:
MONITOR DTC STATUS
1. Clear the DTC with scan tool.
2. Operate the vehicle within the following conditions:
- Engine run time at idle over 10 minutes
- Engine Oil Temp. is between 20 °C(68 °F) and 110 °C(230 °F)
3. Ignition "ON" & Engine "OFF".
4. Using a scan tool, monitor DTC.
5. Go to applicable troubleshooting procedure for the following conditions
- If any DTCs related to OCV (P0011) are stored, do ALL REPAIRS associated with those codes before proceeding with this troubleshooting procedure.
- If DTC P0340 is set again, go to next step as below
- If other DTCs are stored, go to the applicable troubleshooting procedure.
- If no DTC output, go to "Verification of Vehicle Repair" procedure.
6. Press F4 (DTAL) to select DTC information from the DTCs menu
7. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
8. Read "DTC Status" parameter.
9. Is parameter displayed "History (Not Present) fault"?
NOTE:
- History (Not Present) fault : DTC occurred but has been cleared.
- Present fault : DTC is occurring at present time.
YES - Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO - Go to next step as below
POWER CIRCUIT INSPECTION
1. Ignition "OFF".
2. Disconnect CMP sensor connector.
3. Ignition "ON" & Engine "OFF".
4. Measure voltage between terminal 1 of the sensor harness connector and chassis ground.
Specification : Approx. B+
5. Is voltage within the specification?
YES - Go to "Ground Circuit Inspection" procedure
NO - Check for a open in the power supply circuit between the main relay and the CMPS. Especially check for open or blown 10 A sensor fuse.
Repair as necessary and go to "Verification of Vehicle Repair" procedure
GROUND CIRCUIT INSPECTION
1. Ignition "OFF".
2. Measure resistance between terminal 2 of the sensor harness connector and chassis ground.
Specification : Approx. 0 ohm
3. Is resistance within the specification?
YES - Go to "Signal Circuit Inspection" procedure
NO - Check for an open or short to battery in the ground circuit.
Repair as necessary and go to "Verification of Vehicle Repair" procedure
SIGNAL CIRCUIT INSPECTION
1. Check for short to ground in signal harness
1. Measure resistance between terminal 3 of sensor harness connector and chassis ground.
Specification : Infinite
2. Is resistance within the specification?
YES - Go to next step as below
NO - Repair as necessary and go to "Verification of Vehicle Repair" procedure.
2. Check for short to battery in signal harness
1. Disconnect ECM connector.
2. Ignition "ON" & Engine "OFF".
3. Measure voltage between terminal 3 of sensor harness connector and chassis ground.
Specification : Approx. 0 V
4. Is voltage within the specification?
YES - Go to next step as below
NO - Repair as necessary and go to "Verification of Vehicle Repair" procedure.
3. Check for open in signal harness
1. Ignition "OFF".
2. Measure resistance between terminals 3 of sensor harness connector and 80 of the ECM connector.
Specification : Approx. 0 ohm
3. Is resistance within the specification?
YES - Go to next step as below
NO - Repair as necessary and go to "Verification of Vehicle Repair" procedure.
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES - Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO - Go to next step as below.
COMPONENT INSPECTION
1. Reconnect the CMPS and ECM connectors
2. Set up an oscilloscope as follows :
Channel A (+): terminal 3 of the CKPS (back probe), (-): Ground
Channel B (+): terminal 3 of the CMPS (back probe), (-): Ground
3. Start the engine and check for signal waveform compared with reference waveform as below.
4. Is the signal waveform normal?
YES - Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO - Remove CMPS and check for air gap. Readjust as necessary and go to "Verification of Vehicle Repair" procedure
- If fail to synchronize with CKP sensor, check that the crankshaft and camshaft are correctly aligned the matching marks of the pulleys. Repair or readjust as necessary and go to "Verification of Vehicle Repair" procedure
- Check CMPS for contamination, deterioration, or damage. Substitute with a known-good CMPS and check for proper operation. If the problem is corrected, replace CMPS and then go to "Verification of Vehicle Repair" procedure
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Press F4 (DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
3. Read "DTC Status" parameter.
4. Is parameter displayed "History (Not Present) fault"?
YES - System performing to specification at this time. Clear the DTC
NO - Go to the applicable troubleshooting procedure.