Suzuki Swift Sport 2004 Service & Repair Manual page 162

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 signals 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 piston is in the compression stroke and the engine speed.
DTC Detecting Condition and Trouble Area
DTC detecting condition
• 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)
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 referring 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.
Step
1 Was "Engine and Emission Control System Check"
performed?
2 CMP sensor and connector for proper installation check
Is CMP sensor installed properly and connector connected
securely?
• CMP sensor circuit open or short
• Signal rotor teeth damaged
• CMP sensor malfunction, foreign material being attached
• ECM
Action
Trouble area
or improper installation
Yes
Go to Step 2.
Go to Step 3.
No
Go to "Engine and
Emission Control
System Check".
Correct.