P0340

DTC P0340

DTC Detecting Condition and Trouble Area






Wiring Diagram

Refer to P0016 DTC P0016.

System Description

The CMP sensor located on the cylinder head consists of the signal generator (magnetic sensor) and signal rotor (fixed to intake camshaft).

The signal generator generates reference signal through slits in the signal rotor 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 Pinout Values and Diagnostic Parameters Inspection of ECM and Its Circuits.

Based on CMP sensor signal and CKP sensor signal, ECM judges which cylinder piston is in the compression stroke.

DTC Confirmation Procedure

NOTE:

If DTCs other than aimed DTC are previously detected in DTC confirmation procedure, be sure to troubleshoot DTC previously detected.

1) Run engine at idle speed for 1 min.

DTC Troubleshooting

1.
Was "Engine and Emission Control System Check" performed?
YES -
Go to Step 2.
NO -
Go to Engine and Emission Control System Check Engine and Emission Control System Check.

2. DTC check

Check DTC.

Is there DTC(s) other than P0340?
YES -
Go to applicable DTC(s).
NO -
Go to Step 3.

3. CMP sensor power supply circuit check

Turn OFF ignition switch and disconnect connector from CMP sensor.
Check for proper terminal connection to CMP sensor connector.
If connections are OK, turn ignition switch to ON position.
Check that CMP sensor power supply circuit (A1) is battery voltage.

Is it good condition?
YES -
Go to Step 4.
NO -
Repair or replace defective wire harness.

4. CMP sensor signal circuit and ground circuit check

Turn OFF ignition switch and disconnect connectors from ECM.
Check for proper terminal connection to ECM connectors.
If connections are OK, check that CMP sensor signal circuit (A2) and ground circuit (A3) are as follows.
- Wiring harness resistance of each CMP sensor signal circuit and ground circuit is less than 3 ohms.
- Insulation resistance between CMP sensor signal circuit and vehicle body ground is infinity.
- Insulation resistance of wire harness is infinity between CMP sensor signal circuit terminal and each terminal at CMP sensor connector.
- Insulation resistance of wire harness is infinity between CMP sensor ground circuit terminal and each terminal at CMP sensor connector.
- Circuit voltage of each CMP sensor signal circuit and ground circuit is 0 - 1 V with ignition switch in ON position.

Are they in good condition?
YES -
Go to Step 5.
NO -
Repair or replace defective wire harness.

5. CMP sensor and signal rotor check

Check CMP sensor and signal rotor. Camshaft Position (CMP) Sensor Inspection

Are they in good condition?
YES -
Substitute a known-good ECM and recheck.
NO -
Replace CMP sensor.