53
3
、
Sensor failure
4
、
Ignition switch failure
5
、
Ignition coil failure
6
、
Spark plug cap failure
7
、
Spark plug damaged
8
、
Short circuit is found in power resource
circuit
Abnormal noise of engine
Diagnosis
Cause
1
、
Abnormal noise of valve
1
、
Wide valve clearance
2
、
Abrasion of valve
2
、
Piston and cylinder knocking
1
、
Abrasion on piston and cylinder body
2
、
Abrasion on piston pin and smaller end
of crankshaft connecting rod
3
、
Abrasion on bigger end of crankshaft
connecting rod
3
、
Abnormal noise of bearing
1
、
Bearing on crankshaft connecting rod damaged
2
、
Bearing of camshaft damaged
4
、
Abnormal noise of chain of cam 1
、
Lengthened chain
2
、
Teeth abrasion of timing sprocket
wheel
3
、
Abrasion on guiding plate or tension
plate
4
、
Incorrect adjustment for chain
tensioner
5
、
Abnormal noise of transmission and driven gear 1
、
Insufficient machining precision of gears