1A-7 Engine General Information and Diagnosis:
Diagnostic Information and Procedures
Engine Symptom Diagnosis
B940H21104001
Condition
Possible cause
Correction / Reference Item
Engine will not start or is
hard to start
(Compression too low)
Valve clearance out of adjustment.
Adjust.
Worn valve guide or poor seating of
valve.
Repair or replace.
Mistimed valve.
Adjust.
Excessively worn piston rings.
Replace.
Worn-down cylinder bores.
Replace.
Too slow starter motor cranking.
Refer to “Starting System Diagram in Section
1I (Page 1I-1)”.
Poor seating of spark plugs.
Retighten.
Engine will not start or is
hard to start (Plug not
sparking)
Fouled spark plugs.
Clean.
Wet spark plugs.
Clean and dry.
Defective ignition coil/plug caps.
Replace.
Defective CKP sensor.
Replace.
Defective ECM.
Replace.
Open-circuited wiring connection.
Repair or replace.
Open or short in high-tension cords.
Replace.
Engine will not start or is
hard to start (No fuel
reaching the intake
manifold)
Clogged fuel filter or fuel hose.
Clean or replace.
Defective fuel pump.
Replace.
Defective fuel pressure regulator.
Replace.
Defective fuel injectors.
Replace.
Defective fuel pump relay.
Replace.
Defective ECM.
Replace.
Open-circuited wiring connection.
Check and repair.
Engine will not start or is
hard to start (Incorrect
fuel/air mixture)
TP sensor out of adjustment.
Adjust.
Defective fuel pump.
Replace.
Defective fuel pressure regulator.
Replace.
Defective TP sensor.
Replace.
Defective CKP sensor.
Replace.
Defective IAP sensors.
Replace.
Defective ECM.
Replace.
Defective ECT sensor.
Replace.
Defective IAT sensor.
Replace.
Clogged ISC valve air passage way.
Repair or replace.
Engine idles poorly
Valve clearance out of adjustment.
Adjust.
Poor seating of valves.
Replace or repair.
Defective valve guides.
Replace.
Worn down camshafts.
Replace.
Too wide spark plug gaps.
Adjust or replace.
Defective ignition coil/plug caps.
Replace.
Defective CKP sensor.
Replace.
Defective ECM.
Replace.
Defective TP sensor.
Replace.
Defective fuel pump.
Replace.
Imbalanced throttle valve.
Adjust.
Damaged or cranked vacuum hose.
Replace.
Damaged or clogged ISC valve.
Repair or replace.
ISC incorrect learning.
Reset learned value.
Summary of Contents for Intruder VZ1500
Page 2: ......
Page 4: ......
Page 14: ...00 9 Precautions ...
Page 62: ...0C 12 Service Data ...
Page 190: ...1D 1 Engine Mechanical Engine Engine Mechanical Schematic and Routing Diagram ...
Page 484: ...4C 10 Rear Brakes ...
Page 522: ...5C 17 Clutch ...
Page 536: ...6B 11 Steering Handlebar ...
Page 580: ...Prepared by September 2008 Part No 99500 39370 03E Printed in U S A 580 ...