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SEN02630-05
Failure code [CA731] Eng Bkup Speed Sens Phase Error
Action code
Failure code
E15
Contents of
• Phase error was detected in signals from engine Ne speed sensor and engine Bkup speed sensor
trouble
Action of con-
• Controls the engine with signal from engine Ne speed sensor.
troller
• Turns the centralized warning lamp and alarm buzzer ON.
Problem that
• Engine does not start at all or does not start easily.
appears on
• Idle speed is unstable.
machine
• Exhaust gas becomes black.
Related infor-
• Method of reproducing failure code: Start engine.
mation
Breakage of engine Ne
1
speed sensor
Breakage of engine Bkup
2
speed sensor
Defective installation or
3
breakage of rotation sensor
wheel on crankshaft side
Possible causes
and standard
value in normal
Defective installation or
state
4
breakage of rotation sensor
ring on camshaft side
Defective timing of crank-
5
shaft and camshaft
Defective connection of
6
ground terminal
34
Trouble
CA731
Cause
Engine Bkup speed sensor phase error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
Engine Ne speed sensor may be broken. Check it directly.
Engine Bkup speed sensor may be broken. Check it directly.
Rotation sensor wheel on crankshaft side may be installed defec-
tively or broken. Check it according to the following procedure.
1) Set No. 1 cylinder at compression top dead center
(Match stamped mark).
2) If center of oblong hole of rotation sensor wheel is at tip of Ne
speed sensor, rotation sensor wheel is installed normally.
Rotation sensor ring on camshaft side may be installed defectively
or broken. Check it according to the following procedure.
1) Set No. 1 cylinder at compression top dead center
(Match stamped mark).
2) Remove Bkup speed sensor.
3) If 2 grooves (1 crest) of rotation sensor ring are seen through
sensor mounting hole, rotation sensor ring is installed normally.
Timing of crankshaft and camshaft may be defective. Check it
directly.
Ground terminal may be connected defectively. Check following ter-
minals directly.
• Ground terminal of machine ((–) terminal of battery)
• Ground terminal of engine
• Ground terminal of engine controller
• Ground terminal of starting motor
40 Troubleshooting
1
PC300, 350-8
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Troubleshooting
