jcb G20 Operator's Manual page 139

4 HPV buzzing fault
Step Trouble
1 Fuel injector fault
2 Injector connection fault
3 Wiring fault
Step Trouble
1 Injector connection fault
2 Injector faulty
3 Wiring fault
Step Trouble
1 Fuel injector fault
2 Injector connection fault
3 Wiring fault
Step Trouble
1 Injector fault - electrical
132
If the electrical resistance is OK, replace the rail and HPV.
If no fault is found proceed to step 4.
Perform the HPV buzz test. If the HPV is not buzzing replace
the rail and HPV.
If the HPV buzzes, raise Techweb Helpdesk call.
Table 54. Open Circuit Injector
Action/Remedy
Perform the injector buzz test, if the injector is faulty it will not
produce a buzzing sound. In such instances raise Techweb
Helpdesk call.
If no fault is found proceed to step 2.
Check the resistance of injector. For solenoid, it should be less
than 1Ω.
If the resistance is incorrect, change the injector and calibrate
it.
If no fault is found proceed to step 3.
Check the harness continuity and electrical installation, re-
pair/replace as necessary. If no fault is found
If no fault is found raise Techweb Helpdesk call.
Table 55. Injection Bank
Action/Remedy
Check the injector connections corresponding to faulty bank,
repair as necessary.
If no fault is found proceed to step 2.
Check all the injectors individually. Replace the injector and re-
calibrate the ECU with the trim file of the new injector.
If no fault is found proceed to step 3.
Check the harness continuity and electrical installation, re-
pair/replace as necessary.
If no fault is found raise Techweb Helpdesk call.
Table 56. Short Circuit Injector
Action/Remedy
Perform the injector buzz test, if the injector is faulty it not will
produce a buzzing sound. In such instances raise Techweb
Helpdesk call.
If no fault is found proceed to step 2.
Disconnect the injector (one by one) to see if the fault disap-
peared. Repair/ replace as necessary.
Disconnect the engine harness inter connect plug it to see if
the fault disappears. Repair/replace as necessary.
If no fault is found proceed to step 3.
Check the harness continuity and electrical installation, re-
pair/replace as necessary.
If no fault is found raise Techweb Helpdesk call.
Table 57. Engine Low on Power
Action/Remedy
If an electrical injector fault is present raise Techweb Helpdesk
call.
If no fault is found proceed to step 2.
9831/0650-3
Maintenance
Fault-Finding
132