P0340

COMPONENT DESCRIPTION
The camshaft position sensor is a basic component of the ECCS 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° signal and 4 slits for a 180° 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.




ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values and are measured between each terminal and (43) (ECCS ground).




ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

NOTE: Before performing the following procedure, confirm that battery voltage is more than 10.5V.

With CONSULT




(1) Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT.
(2) Start engine and run it for 2 seconds. (It engine does not run, crank engine for at least 2 seconds.)

OR

With GST
(1) Start engine and run it for 2 seconds. (If engine does not run, crank engine for at least 2 seconds.)
(2) Select "MODE 7" with GST.

OR

NO TOOLS
(1) Start engine and run it for 2 seconds. (If engine does not run, crank engine for at least 2 seconds.)
(2) Turn ignition switch "OFF", wait at least 7 seconds and then turn "ON".
(3) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.

EC-CMPS-01 Camshaft Position Sensor (CMPS) (DTC P0340):

WIRING DIAGRAM




DIAGNOSTIC PROCEDURE (DETECTABLE CIRCUIT)




DIAGNOSTIC PROCEDURE (NON-DETECTABLE CIRCUIT)

COMPONENT INSPECTION
Camshaft Position Sensor
1. Start engine.




2. Check voltage between terminals (3), (4) and ground with DC range.

Condition / Terminals / Voltage
Engine running at idle / (3) and ground / Approximately 0.3V*
(4) and ground / Approximately 2.5V*

*Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
If NG, replace distributor assembly with camshaft position sensor.




3. Visually check signal plate for damage or dust.