1A
DTC P0340: Camshaft Position (CMP) Sensor Circuit
Wiring Diagram
1. CMP sensor 4. Main relay 7. “FI” fuse 10. To CKP sensor
2. Signal rotor 5. Ignition switch 8. “IG” fuse      
3. ECM 6. Relay box 9. “IGN1” fuse      
System Description
The CMP sensor located on the transmission side of cylinder head consists of the signal generator (magnetic sensor) and signal rotor (intake camshaft portion).
The signal generator generates Reference signal through slits in the slit plate which turns together with the camshaft.
Reference signal
The CMP sensor generates 6 pulses of signals each of which has a different waveform length while the camshaft makes one full rotation. Refer to Inspection of ECM and Its Circuits:M13A with VVT .
Based on these signals, ECM judges which cylinder piston is in the compression stroke and the engine speed.
DTC Detecting Condition and Trouble Area
DTC detecting condition Trouble area
• CMP sensor pulse is less than 20 pulses per crankshaft 8 revolutions
• CMP sensor pulse is more than 28 pulses per crankshaft 8 revolutions
• CMP sensor pulse is less than 20 pulses between BTDC 155° CA and BTDC 5° CA with crankshaft 8 revolutions from engine start.
(1 driving cycle detection logic)
• CMP sensor circuit open or short
• Signal rotor teeth damaged
• CMP sensor malfunction, foreign material being attached or improper installation
• ECM
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Crank engine for 5 sec.
4) Check DTC and pending DTC.
DTC Troubleshooting
Step Action YES NO
1
Was “Engine and Emission Control System Check” performed?
Go to Step 2.
Go to Engine and Emission Control System Check:M13A with VVT .
2
CMP sensor and connector for proper installation check
Is CMP sensor installed properly and connector connected securely?
Go to Step 3.
Correct.
3
Wire harness and connection check
1) Disconnect connector from CMP sensor.
2) Check for proper connection to CMP sensor at “BLU/BLK”, “WHT” and “BLK” wire terminals.
3) If OK, turn ignition switch ON and check for voltage at “BLU/BLK”, “WHT” and “BLK” wire terminals of disconnected CMP sensor connector.
CMP sensor voltage
Terminal “B+”: 10 – 14 V
Terminal “Vout”: 4 – 5 V
Terminal “GND”: 0 V
Is check result satisfactory?
Go to Step 7
Go to Step 4.
4
Was terminal “Vout” voltage in Step 3 within specification?
Go to Step 5.
“WHT” wire open or shorted to ground/power supply circuit.
If wire and connection are OK, substitute a known-good ECM and recheck.
5
Ground circuit check
1) Turn ignition switch to OFF position.
2) Measure resistance between “BLK” wire terminal of CMP sensor connector and engine ground.
Is measured resistance value less than 3 Ω?
“BLU/BLK” wire open.
“BLK” wire open or high resistance.
6
Was terminal “B+” voltage in Step 3 within specification?
Go to Step 7.
“BLU/BLK” wire open. If wire and connection are OK, substitute a known-good ECM and recheck.
7
CMP sensor check
1) Check CMP sensor and signal rotor tooth referring to Camshaft Position (CMP) Sensor Inspection:M13A .
Is check result satisfactory?
Substitute a known-good ECM and recheck.
Replace CMP sensor or intake camshaft.
NOTE:
Upon completion of inspection and repair work, perform “DTC Confirmation Procedure” and confirm that the trouble has been corrected.