Perkins M216C - Page 194

194 KENR9126
Troubleshooting Section
Note: On four cylinder engines, shorting a shared
supply will aff
ect the status of two injectors. Ignore
the status of the other injector that is on the shared
supply.
Note: On six cylinder engines, shorting a shared
supply will affect the status of three injectors. Ignore
the status of
the other injectors that are on the shared
supply.
Results:
•
OK – The ECM is OK.
Repair: On six cylinder engines, if the three
injectors that share a supply indicate “Open Circuit”
fault code
s, the open circuit is probably caused by
afaultyECM.
Repair the
engine harness or replace the engine
harness, as required.
Use the el
ectronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair eliminates the fault.
STOP.
•
Not OK – T
heremaybeafaultwiththeECM.
Repair: Perform the following procedure:
1. Make sure that the latest flash file for the
application is installed in the ECM. Refer to
Troubl
eshooting, “Flash Programming”.
2. Remove the jumper wire from connector P2 and
reins
tall the injector wires.
3. Contact the Technical Help Desk.
Note: This consultation can greatly reduce the repair
time.
4. If the Technical Help Desk recommends the
use of a test ECM, install a test ECM. Refer to
Trou
bleshooting, “Replacing the ECM”.
5. Perform the “Injector Solenoid Test”.
6. If the fault is resolved with the test ECM,
reconnect the suspect ECM.
7. If the fault returns with the suspect ECM,
replace the ECM.
8. Use the electronic service tool in order to clear
all logged diagnostic codes and then verify that
th
e repair eliminates the fault.
STOP.
Test Step 8. Check the Harness between
theECMandtheValveCoverBasefora
Short Circuit
Electrical shock hazard. The electronic unit i njec-
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 the connectors from the valve cover
base.
C. Turn the keyswitch to the ON position.
D. Perform the “Injector Solenoid Test” at least two
times.
Expected Result:
All cylinders indicate “Current Below Normal”.
Results:
•
OK – All cylinders indicate “Current Below
Normal”. Proceed to Test Step 10.
•
Not OK – One or more cylinders indicate “Cu rrent
Above Normal”. Note the cylinders that indicate
“Current Above Normal”. Proceed to Test Step 9.
Test Step 9. Check the ECM for a Short
Circuit
Elec
trical shoc k hazard. The electronic unit i njec-
tor system uses 67-73 volts.
A. Tur
n 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 and check
for evidence of moisture entry.
C. Turn the keyswitch to the ON position.
D. Pe
rform the “Injector Solenoid Test” at least two
times.
E
xpected Result:
All cylinders indicate “Current Below Normal” when
c
onnector P2 is disconnected from the ECM.