Downloaded from www.Manualslib.com manuals search engine 1A-112 Engine General Information and Diagnosis:
System Description
The CMP sensor located on the transmission side of cylinder head consists of the signal generator (magnetic sensor)
and signal rotor (intake camshaft portion).
The signal generator generates reference signal through slits in the slit plate which turns together with the camshaft.
Reference signal
The CMP sensor generates 6 pulses of si gnals each of which has a different waveform length while the camshaft
makes one full rotation. Refer to “Inspection of ECM and Its Circuits”.
Based on these signals, ECM judges which cylinder pist on is in the compression stroke and the engine speed.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure 1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Crank engine for 5 sec.
4) Check DTC.
DTC Troubleshooting
NOTE
• When measuring circuit voltage, resistance and/ or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors re ferring to “Inspection of ECM and Its Circuits”.
• Upon completion of inspection and repair work, perform “DTC Confirmation Procedure” and confirm that the trouble has been corrected.
DTC detecting condition Trouble area
• CMP sensor pulse is less than 20 pulses per crankshaft 8 revolutions
• CMP sensor pulse is more than 28 pulses per crankshaft 8 revolutions
• CMP sensor pulse is less than 20 pulses between BTDC 155 ° crank angle and BTDC 5 ° crank angle
with crankshaft 8 revolutions from engine start.
(1 driving cycle detection logic) • CMP sensor circuit open or short
• Signal rotor teeth damaged
• CMP sensor malfunction, foreign material being attached
or improper installation
•ECM
Step Action YesNo
1 Was “Engine and Emission Control System Check”
performed? Go to Step 2.
Go to “Engine and
Emission Control
System Check”.
2 CMP sensor and connector for proper installation check
Is CMP sensor installed properly and connector connected
securely? Go to Step 3.
Correct.
