P0340

P0340 CMP SENSOR







Component Description
The camshaft position sensor is a basic component of the engine control system. It monitors engine speed and piston position. These input signals to the ECM are used 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 a 1 ° (POS) signal and 6 slits for a 120 ° (REF) signal. The wave-forming circuit consists of Light Emitting Diodes (LED) and photo diodes.

The rotor plate is positioned between the LED and the photo diode. The LED transmits light to the photo diode. As the rotor plate turns, the slits cut the light to generate rough-shaped pulses. These pulses are converted into on-off signals by the wave-forming circuit and sent to the ECM.

The distributor is not repairable and must be replaced as an assembly except distributor cap and rotor head.

NOTE: The rotor screw which secures the distributor rotor head to the distributor shaft must be torqued properly.

Tightening Torque: 3.6 ± 0.3 N.m (37 ± 3 kg.cm, 32 ± 3 in-lb)

ECM Terminals And Reference Value Part 1:

ECM Terminals And Reference Value Part 2:

On Board Diagnosis Logic
Malfunction is detected when (Malfunction A) either 1 ° or 120 ° signal is not sent to ECM for the first few seconds during engine cranking, (Malfunction B) either 1 ° or 120 ° signal is not sent to ECM often enough while the engine speed is higher than the specified engine speed, (Malfunction C) the relation between 1 ° and 120 ° signal is not in the normal range during the specified engine speed.

POSSIBLE CAUSE
- Harness or connectors
(The camshaft position sensor circuit is open or shorted.)

- Camshaft position sensor
- Starter motor
- Starting system circuit
- Dead (Weak) battery

DTC Confirmation Procedure

NOTE:
- Perform "PROCEDURE FOR MALFUNCTION A" first. If DTC cannot be confirmed, perform "PROCEDURE FOR MALFUNCTION B AND C".
- If "DTC 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-II
1. Turn ignition switch ON.




2. Select "DATA MONITOR" mode with CONSULT-II.
3. Crank engine for at least 2 seconds.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

With GST
Follow the procedure "With CONSULT-II".

PROCEDURE FOR MALFUNCTION B AND C

With CONSULT-II
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" below.

With GST
Follow the procedure "With CONSULT-II".

Wiring Diagram

EC-CMPS-01:

Diagnostic Procedure

Step 1 - 3:

Step 4 - 6:

Step 7 - 9: