6-1-86 ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE)
DTC P0340 (DTC No.42) Camshaft Position Sensor Circuit Malfunction
WIRING DIAGRAM
SYSTEM DESCRIPTION
CMP sensor detects REF signal and POS signal.
• REF signal : 4 pulses/1 revolution of camshaft. There are 2 different kinds of wavelength. Based on REF sig-
nal, ECM (PCM) judges which cylinder is at TDC.
• POS signal : 6 pulse/1 revolution of camshaft. Each of POS signals has equivalent wavelength. Based on
POS signal, ECM (PCM) judges the wavelength of REF signals, engine speed and piston position.
REFERENCE
Connect oscilloscope between terminals C51-1-13 (POS) or C51-1-12 (REF) and C51-3-26 (ground) of ECM
(PCM) connector connected to ECM (PCM) and check CMP sensor signal.
1. CMP sensor
2. To main relay
3. ECM (PCM)
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