P0340

COMPONENT DESCRIPTION
The camshaft position sensor (CMPS) is a basic component of the ECM. It monitors engine speed and piston position. It sends signals to the ECM to control fuel injection, ignition timing and other functions.

The camshaft position sensor has a rotor plate and a wave-forming circuit. The rotor plate has 360 slits for 1° signal and 8 slits for 90° signal. Light Emitting Diodes (LED) and photo diodes are built into the wave-forming circuit.

When the rotor plate passes between the LED and the photo diode, the following happens:

Slits in the rotor plate continually cut the transmitted light to the photo diode from the LED. This generates rough-shaped pulses converted into on-off pulses by the wave forming circuit sent to the ECM.

ECM Terminals And Reference Value Part 1:

ECM Terminals And Reference Value Part 2:

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
Perform "Procedure for malfunction A" first. If DTC cannot be confirmed, perform "Procedure for malfunction B and C".

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5 V at idle.




Procedure for malfunction A

With Consult
1. Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT-II.
2. Start engine and run it for at least 2 seconds at idle speed.
(If engine does not run, turn ignition switch to "START" for at least 2 seconds.)
3. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".

OR

With Generic Scan Tool
Follow the procedure "With CONSULT-II" above.

Procedure for malfunction B and C

With Consult
1. Turn ignition switch "ON".
2. Select "DATA MONITOR" mode with CONSULT-II.
3. Start engine and run it for at least 2 seconds at idle speed.
4. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".

OR

With Generic Scan Tool
Follow the procedure "With CONSULT-II" above.

EC-CMPS-01:

EC-CMPS-01 Connector View:

WIRING DIAGRAM

Part 1:

Part 2:

DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION







Camshaft position sensor
1. Start engine and warm it up to the normal operating temperature.
2. Check voltage between ECM terminals (59) (POS) or (55), (58) (REF) (ECM terminal) and ground with DC range.

CAUTION: Do not use ECM ground terminals when measuring voltage
Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals such as the body ground.

If NG, replace camshaft position sensor.