KENR9126 175
Troubleshooting Section
•
Not OK – There is a fault with the connectors
and/or the harn
ess.
Repair: Repair the connectors or the harness
and/or replac
e the connectors or the harness.
Ensure that all of the seals are correctly in place
and ensure that the connectors are completely
coupled.
Use the electronic service tool in order to clear all
logged diag
nostic codes and then verify that the
repair has eliminated the fault.
STOP.
Test Step 2. Check for Active Diagnostic
Codes
A. Connect the electronic service tool to the
diagnostic connector.
B. Turn the keyswitch to the ON position.
C. Use the e
lectronic service tool to verify if any
of the following diagnostic codes are active or
recently logged:
•
1779-05 Fuel Rail #1 Pressure Valve Solenoid
current below normal
•
1779-06 Fuel Rail #1 Pressure Valve Solenoid
current above normal
Expected Result:
One or
more of the following diagnostic codes are
active or recently logged:
•
1779-
05 Fuel Rail #1 Pressure Valve Solenoid
current below normal
•
1779
-06FuelRail#1PressureValveSolenoid
current above normal
Resu
lts:
•
1779-05 – Proceed to Test Step 3.
•
1779-06 – Proceed to Test Step 7.
•
Not
OK – No active diagnostic codes or recently
logged diagnostic codes are displayed. STOP.
Te
st Step 3. Check the Harness for an
Op
en Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect P2 from the ECM.
C
.
M
easure the resistance between P2:25 and P2:26.
Expected Result:
The nominal resistance is less than 2 Ohms.
Results:
•
OK – The harness and the solenoid do not have
an open circu
it.
Repair: Check the high pressure fuel system for
leaks. A mec
hanical relief valve is installed in the
high pressure fuel rail. Check that there is no flow
of fuel from the mechanical relief valve. Refer
to Operatio
n and Maintenance Manual, “High
Pressure Fuel Lines”.
If the fuel
system is Not OK, repair the fuel system
and restart the diagnostic process.
If the fuel
system is OK, proceed to Test Step 4.
•
Not OK – There is an open circuit. Proceed to Test
Step 4.
Test Step 4. Check the Fuel Rail Pump
Solenoid for an Open Circuit
A. Turn the keyswitch to the OFF position.
B. Disconn
ect the connector from the fuel rail pump
solenoid.
C. Measur
e the resistance of the fuel rail pump
solenoid.
Expec
ted Result:
The nominal resistance is less than 1 Ohm.
Results:
•
OK – T
here is an open circuit or there is an
excessive resistance in the harness.
Repa
ir: Repair the connectors or the harness
and/or replace the connectors or the harness.
Ens
ure that all of the seals are correctly in place
and ensure that all connectors are correctly
coupled.
Use the electronic service tool in order to perform
the fuel rail pump solenoid test.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
re
pair eliminated the fault.
STOP.
•
Not OK – The fuel rail pump solenoid is faulty.
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