P0340

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.

Torque: 3.6 ± 0.3 Nm (37 ± 3 kg.cm, 32 ± 3 in.lb.)

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ECM Terminals and Reference Value
Specification data are reference values and are measured between each terminal and 32 (ECM ground).




On Board Diagnosis Logic

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 10.5V at idle.

PROCEDURE FOR MALFUNCTION A

With CONSULT
1. Turn ignition switch "ON".




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

With GST
1. Crank engine for at least 2 seconds.
2. Select "MODE 7" with CST.
3. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

Without Scan Tool
1. Crank engine 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.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

PROCEDURE FOR MALFUNCTION B AND C

With CONSULT
1. Turn ignition switch "ON".
2. Select "DATA MONITOR" mode with CONSULT.
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
1. Start engine and run it for at least 2 seconds at idle speed.
2. Select "MODE 7" with GST.
3. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

Without Scan Tool
1. Start engine and run it for at least 2 seconds at idle speed.
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.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

Wiring Diagram

EC-CMPS-01:

EC-CMPS-01 Connectors View:

Diagnostic Procedure

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Step 9:

Component Inspection







1. Install any parts removed.
2. Start engine.
3. Check voltage between ECM terminals 44, 48 and ground, ECM terminal 49 and ground with DC range.

If NG, replace distributor assembly with camshaft position sensor.