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 4 slits for a 180° (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 distributor rotor head to the distributor shaft must be torqued properly.
Torque: 3.3 - 3.9 N.m (0.34 - 0.40 kg.m, 29.5 - 34.7 in.lb)
ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values and are measured between each terminal and (43) (ECM ground).
ON BOARD DIAGNOSIS LOGIC:
DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
Perform "Procedure for malfunction A" first. If DTC cannot be confirmed, perform "Procedure for malfunction B and C".
Procedure for malfunction A
NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and waft 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.
With Consult
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.
OR
With Generic Scan Tools
1. Crank engine for at least 2 seconds.
2. Select "MODE 7" with GST.
3. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.
OR
Without Scan Tools
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
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 at idle.
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" below.
OR
With Generic Scan Tools
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.
OR
Without Scan Tools
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.
EC-CMPS-01:
EC-CMPS-01 - Connector View:
WIRING DIAGRAM
M8, E65:
Diagnostic Procedure:
DIAGNOSTIC PROCEDURE (DETECTABLE CIRCUIT)
COMPONENT INSPECTION
1. Start engine and warm it up to the normal operating temperature.
2. Check voltage between ECM terminals (41) or (42), (40) and ground.
If NG, replace distributor assembly with camshaft position sensor.