P0340
2ZR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0340: Camshaft Position Sensor Circuit Malfunction
DTC P0340 - Camshaft Position Sensor Circuit Malfunction
DTC P0342 - Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor)
DTC P0343 - Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor)
DESCRIPTION
The camshaft position sensor for intake camshaft (G signal sensor) consists of a magnet and MRE element.
The camshaft has a timing rotor for the camshaft position sensor. When the camshaft rotates, changes occur in the air gaps between the timing rotor and MRE element, which affects the magnet. As a result, the resistance of the MRE material fluctuates. The camshaft position sensor converts the camshaft rotation data to pulse signals, and uses the pulse signals to determine the camshaft angle, which it sends to the ECM. Then the ECM uses this data to control fuel injection time and injection timing.
HINT: DTC P0340 indicates a malfunction relating to the CMP sensor circuit (the wire harness between the ECM and CMP sensor, and the CMP sensor itself).
Reference: Inspection using an oscilloscope
MONITOR DESCRIPTION
If no signal is transmitted by the CMP sensor despite the engine revolving, or the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.
If the malfunction is not repaired successfully, the DTC is set 10 seconds after the engine is nest started.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All:
P0340 Camshaft position Sensor Range Check (Cranking):
P0340 Camshaft position/Crankshaft Position Misalignment:
P0340, P0342, P0343 CMP Sensor Range Check:
TYPICAL MALFUNCTION THRESHOLDS
P0340 Camshaft Position Sensor Range Check (Cranking):
P0340 Camshaft Position/Crankshaft Position Misalignment:
P0340 CMP Sensor Range Check:
P0342 CMP Sensor Range Check:
P0343 CMP Sensor Range Check:
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
- Read freeze frame data using a Techstream. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was LEAN or RICH, and other data from the time the malfunction occurred.
- If no problem is found through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.
PROCEDURE
1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0340, P0342 AND P0343)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester ON.
(d) Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
(e) Read DTCs.
Result:
HINT: If any DTCs other than P0340, P0342 and P0343 are output, troubleshoot those DTCs first.
B -- GO TO DTC CHART
A -- Continue to next step.
2. INSPECT CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) (POWER SOURCE)
(a) Disconnect the camshaft position sensor (for intake camshaft) connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:
(d) Reconnect the camshaft position sensor (for intake camshaft) connector.
NG -- CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)
(a) Disconnect the camshaft position sensor (for intake camshaft) connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):
Standard resistance (Check for short):
(d) Reconnect the camshaft position sensor (for intake camshaft) connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR FOR INTAKE CAMSHAFT)
(a) Check the camshaft position sensor (for intake camshaft) installation.
OK:
Sensor is installed correctly.
NG -- SECURELY REINSTALL SENSOR
OK -- Continue to next step.
5. INSPECT INTAKE CAMSHAFT (TIMING ROTOR)
(a) Check the timing rotor of the intake camshaft.
OK:
Camshaft timing rotor does not have any cracks or deformation.
NG -- REPLACE INTAKE CAMSHAFT
OK -- Continue to next step.
6. REPLACE CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT)
NEXT -- Continue to next step.
7. CHECK WHETHER DTC OUTPUT RECURS (P0340, P0342 OR P0343)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester ON.
(d) Clear DTCs DTC Check / Clear.
(e) Start the engine and allow the engine to idle for 10 seconds or more.
(f) Turn the ignition to off.
(g) Start the engine again and allow the engine to idle for 10 seconds or more.
(h) Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
(i) Read DTCs.
Result:
HINT: If the engine does not start, replace the ECM.
B -- REPLACE ECM
A -- Continue to next step.
8. ADJUST VALVE TIMING
HINT: There are no marks on the cylinder head to match-up for the purpose of checking valve timing. Valve timing can only be inspected by lining up the colored plates on the timing chain with the marks on the pulleys. It may be necessary to remove and re-install the chain to match up the alignment marks Reassembly.
NEXT -- Continue to next step.
9. CHECK WHETHER DTC OUTPUT RECURS (P0340, P0342 OR P0343)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester ON.
(d) Clear DTCs DTC Check / Clear.
(e) Start the engine and allow the engine to idle for 10 seconds or more.
(f) Turn the ignition switch to OFF.
(g) Start the engine again and allow the engine to idle for 10 seconds or more.
(h) Select the following menu items: Powertrain / Engine and ECT / Trouble codes.
(i) Read DTCs.
Result:
HINT: If the engine does not start, replace the ECM.
B -- REPLACE ECM
A -- END
10. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)
(a) Disconnect the camshaft position sensor (for intake camshaft) connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):
Standard resistance (Check for short):
(d) Reconnect the camshaft position sensor (for intake camshaft) connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM