jcb G20QS User Manual

Maintenance
Fault-Finding
132 9831/0650-3 132
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.
4 HPV buzzing fault
If the HPV buzzes, raise Techweb Helpdesk call.
Table 54. Open Circuit Injector
Step Trouble 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.
1 Fuel injector fault
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.
2 Injector connection fault
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
3 Wiring fault
If no fault is found raise Techweb Helpdesk call.
Table 55. Injection Bank
Step Trouble Action/Remedy
Check the injector connections corresponding to faulty bank,
repair as necessary.
1 Injector connection fault
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.
2 Injector faulty
If no fault is found proceed to step 3.
Check the harness continuity and electrical installation, re-
pair/replace as necessary.
3 Wiring fault
If no fault is found raise Techweb Helpdesk call.
Table 56. Short Circuit Injector
Step Trouble 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.
1 Fuel injector fault
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.
2 Injector connection fault
If no fault is found proceed to step 3.
Check the harness continuity and electrical installation, re-
pair/replace as necessary.
3 Wiring fault
If no fault is found raise Techweb Helpdesk call.
Table 57. Engine Low on Power
Step Trouble Action/Remedy
If an electrical injector fault is present raise Techweb Helpdesk
call.
1 Injector fault - electrical
If no fault is found proceed to step 2.

jcb G20QS Specifications

General

Brand	jcb
Model	G20QS
Category	Portable Generator
Language	English