Perkins 1106C - Page 166

166 KENR6933
Troubleshooting Section
G. Turn the keyswitch to the ON position.
H. Perform the “Injector Solenoid Test” at least two
times.
Expected Result:
Exchanging th
e harness between the two injectors
caused the fault to move to the other injector.
Results:
•
OK – There is a fault with the injector harness
under the valv
e cover.
Repair: Repair the injector harness or replace the
injector harn
ess under the valve cover.
Use the electronic service tool in order to clear all
logged diagno
stic codes and then verify that the
repair eliminates the fault.
STOP.
•
Not OK – The injector may be faulty.
Repair: Replace the faulty injector. Refer to
Disassembly and Assembly, “Electronic Unit
Injectors - R
emove” and Disassembly and
Assembly, “Electronic Unit Injectors - Install”.
Restore the w
iring to the correct injectors.
Perform the “Injector Solenoid Test”.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair elim
inates the fault.
STOP.
Test Step 7. Check the ECM for an Open
Circuit
Electrical shock hazard. The electronic unit inje c-
tor system uses 67-73 volts.
A. Turn the keyswitch to the OFF position. A strong
electrical shock hazard is present if the keyswitch
is not turned OFF.
B. Disconnect connector P2 from the ECM.
C. Remove the supply wire and the return wire for
the suspect injector from connector P2. Install a
jumper wire into connector P2 in order to provide
a short between the supply and the return of the
suspect injector.
D. Reinstall connector P2 to the ECM.
E. Turn the keyswitch to the ON position.
F. Perform the “In
jector Solenoid Test” at least two
times.
Expected Resu
lt:
The electronic service tool displays “Current Above
Normal” for th
e cylinder with the jumper wire.
Note: On six cylinder engines, shorting a shared
supply will af
fect the status of three injectors. Ignore
the status of the other injectors that are on the shared
supply.
Results:
•
OK – The ECM is O
K.
Repair: On six cylinder engines, if the three
injectors th
at share a supply indicate “Open Circuit”
fault codes, the open circuit is probably caused by
a faulty ECM.
Repair the engine harness or replace the engine
harness, as required.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair elim
inates the fault.
STOP.
•
NotOK –TheremaybeafaultwiththeECM.
Repair: Te m
porarily connect a test ECM.
Remove the jumper wire from connector P2 and
reinstall t
he injector wires.
Perform the “Injector Solenoid Test”.
If the test E CM fixes the fault, reconnect the
suspect ECM.
If the fault returns with the suspect ECM, replace
the ECM. Refer to the Troubleshooting Guide,
“Replacin
gtheECM”.
Use the electronic service tool in order to clear all
logged dia
gnostic codes and then verify that the
repair eliminates the fault.
STOP.