TST 139350

01/11/2021 07:52
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RYKER MY21 Misfire Faults on 903 - 139350
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Summary:
Some 903 engines may trigger misfire faults @ 3800RPM
Type:
General
TST Detail:
Problem :
Some RYKER MY21 with 903 engines are experiencing misfire Pcode (P0301) around 3800 rpm which is hard to solve.
Solution :
Please proceed through the following troubleshooting guideline in order :
Before starting the diagnosis process, make sure all accessories power wires are disconnected from the battery.
Check ground connections on the chassis, the engine and the battery.
Validate also that the unit doesn't have poor quality fuel.
Confirm the unit isn't low in fuel
1. Validate CVT
Most of misfire codes generated by the CVT are triggering all 3 cylinders misfire codes. It is not recommended
to replace CVT components unless you have a misfire code on more than 1 cylinder.
If you have more than 1 misfire cylinder code, then check the belt and replace if any damage are
seen.
2. Inspect ignition system
Check spark plug gap is correct and that no corrosion is on the spark plug. Check that there's no damage to
the spark plug area.
Inspect & test the ignition coils.
Check wiring harness continuity between all ignition coils and ECM pin out.
3. Validate Spark plug & ignition coil
Switch spark plug and coil from a cylinder without a misfiring code into the misfiring cylinder.
Test unit and reach operating RPM that initialy triggered the fault code. Focus your test in this RPM
range.
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If the misfire code transfered of cylinder from the switched parts, replace the faulty spark plug & the
coil by new ones. Retest with new parts.
4. Validate fuel system
Check fuel pressure. (if any of the test pressure are out of spec, inspect the fuel pump & replace if needed)
If fuel pressure was within specifications, validate fuel pressure at RPM range that triggers the fault code.
Make sure to test the unit at running engine temperature and while the engine temperature is still cold.
If at RPM range the fuel pressure is good, switch fuel injector from non-misfiring cylinder with misfiring
cylinder. If the fault code is transfered of cylinder replace the faulty injector.
5. Replace flywheel
If all previous elements were good, replace the flywheel and test the unit.
6. Contact Technical support
If none of the previous check allowed to solve the issue please contact us to allow us to assist you
Please in every situation, open a technical case to allow us to know what solved the issue you had on the unit.
Warranty :
Normal warranty applies
Attachment:
First Published By: Jeremi Hamelin on 2021-10-06
Last Modified By: Eric Fauteux on 2021-10-06
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