P0343
DTC PO343 CAMSHAFT POSITION SENSOR A CIRCUIT HIGH INPUTComponent Location:
GENERAL DESCRIPTION
Camshaft Position Sensor (CMPS) is a hall sensor and detects the camshaft position by using a hall element. It is related with Crankshaft Position Sensor (CKPS) and detects the piston position of the each cylinder which the CKPS can' detect. The CMPS are installed on engine head cover and uses a target wheel installed on the camshaft. This sensor has a hall-effect IC which output voltage changes when magnetic field is made on the EC with current flow. When teeth on the target wheel trigger the sensor, output voltage is 12 V. If not, it is 0 V. These CMP signal is sent to the ECM/PCM and used for determining the ignition timing along with CKP signal. CMPS makes Sequential Injection possible.
DTC DESCRIPTION
If the signal input is high with no phase edge over 12 times, ECM/PCM sets DTC P0343.
DTC Detecting Condition:
Schematic Diagram (A/T):
Schematic Diagram (M/T):
Signal Waveform & Data:
SIGNAL WAVEFORM & DATA
This example shows a typical Crankshaft Position Sensor (CKPS) and Camshaft Position Sensor(CMPS) waveform at idle. The PCM controls the injection and ignition timing by using these signals. Generally CKPS signal is used to detect the piston's position and CMPS signal is used to detect the Top Dead Center of each cylinder.
MONITOR SCANTOOL DATA
1. Connect scantool to Data Link Connector (DLC).
2. IG "ON".
3. Select "Diagnostic Trouble Codes (DTCs)" mode, and then Press F4 (DTAL) to check DTC's information from the DTCs menu.
4. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions noted in the DTC detecting condition.
5. Read "DTC Status" parameter.
6. Is parameter displayed "History (Not Present) fault"??
NOTE :
- History 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/PCM's connector or was repaired and ECM/PCM 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 "Terminal & Connector Inspection" procedure
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminal condition. 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 "CMPS Power circuit inspection" procedure.
POWER CIRCUIT INSPECTION
1. Key "OFF".
2. Disconnect CMPS connector.
3. Key "ON"
4. Measure the voltage between terminal 1 of CMPS harness connector and chassis ground.
Specification : B+
5. Is the measured voltage within specification?
YES - Go to "Ground circuit inspection" procedure.
NO - Repair Open or Short circuit and then, go to "Verification of Vehicle Repair" procedure.
GROUND CIRCUIT INSPECTION
1. Key "OFF".
2. Disconnect CMPS connector.
3. Key "ON"
4. Measure the voltage between terminal 2 of CMPS harness connector and chassis ground.(A)
5. Measure the voltage between terminal 2 and 3 of CMPS harness connector.(B)
Specification : "A" - "B" = Below 200 mV
6. Is the measured voltage within specification?
YES - Go to "Signal circuit inspection" procedure.
NO - Repair Open in signal circuit and then, go to "Verification of Vehicle Repair" procedure.
SIGNAL CIRCUIT INSPECTION
1. Check Open in signal circuit.
1. Key "OFF".
2. Disconnect CMPS connector.
3. Key "ON".
4. Measure the voltage between terminal 2 of CMPS harness connector and chassis ground.
Specification : Approx 12 V
5. Is the measured voltage within specification?
YES - Go to "Short to power circuit inspection" procedure.
NO - Repair Open in signal circuit and then, go to "Verification of Vehicle Repair" procedure.
2. Check Short to power in signal circuit.
1. Key "OFF".
2. Disconnect CMPS connector and ECM/PCM connector.
3. Measure the resistance between terminal 1 and 2 of CMPS harness connector.
Specification : Infinite
4. Is the measured resistance within specifications?
YES - Go to "Component inspection" procedure.
NO - Repair Short to power in signal circuit and then, go to "Verification of Vehicle Repair" procedure.
COMPONENT INSPECTION
1. CMPS check.
1. Key "ON". (Don't disconnect sensors.)
2. Select "vehicle scopemeter" in the menu, and connect channel A of scantool with terminal 2 of CMPS harness connector.
Specification:
3. Engine start. And check the signal waveforms.
4. Is the signal waveform within specifications?
YES - Substitute with a known-good ECM/PCM and check for proper operation. If the problem is corrected, replace ECM/PCM and then go to "Verification of Vehicle Repair" procedure.
NO - 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. Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
3. Are any DTCs present?
YES - Go to the applicable troubleshooting procedure.
NO - Repair as necessary and then, go to "Verification of Vehicle Repair" procedure.