P0340

COMPONENT DESCRIPTION
The camshaft position sensor (CMPS) is a basic component of the ECCS. 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 10 signal and 8 slits for 900 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
Specification data are reference values, and are measured between each terminal and (128) (ECCS ground).




ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

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 10.5V.




With Consult
1) Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT.
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.)

OR

With Generic Scan Tool
1) 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.)
2) Select "MODE 7" with GST.

OR

Without Scan Tools
1) 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.)
2) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
3) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.







DIAGNOSTIC PROCEDURE




WIRING DIAGRAM







COMPONENT INSPECTION
Camshaft position sensor
1. Start engine.
2. Check voltage between ECM terminals (59) (POS) or (55), (REF) and (58) (ECM ground) with DC range.