KENR6933 147
Troubleshooting Section
Test Step 1. In spect the Electrical
Connectors and the Harness
Electrical s hock hazard. The fuel rail pump sole-
noid uses 63 to 73 volts.
A. Turn the keyswitch to the OFF position.
B. Thoroughly inspect the harness connector
P2/J2 and the suspect connector P532. Refer to
Troubleshooting, “Electrical Connectors - Inspect”
for details.
C. Perform a 45 N (10 lb) pull test on each of the
wires in the solenoid connector P532 and the
connector pins 25 and 26 that are associated with
the fuel rail pump solenoid. Refer to illustration 53.
D. Check the harness for abrasions and for pinch
points from the battery to the ECM. Check the
harness for abrasions and for pinch points from
the key switch to the ECM.
E. Perform a “Wiggle Test” by using the Perkins EST
in order to identify intermittent connections.
Expected Result:
All connectors, pins, and sockets are completely
coupled and/or inserted. The harness is free of
corrosion, of abrasion, and of pinch points.
Results:
•
OK – The connectors and the harness appear to
be OK. Proceed to Test Step 2.
•
Not OK – There is a fault with the connectors
and/or the harness.
Repair: Repair the connectors or the harness
and/or replace 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 diagnostic 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 electronic service tool to verify if any
of the followin
g diagnostic codes are active or
recently logged:
•
1779-05 Fuel R
ail #1 Pressure Valve Solenoid
current below normal
•
1779-06 Fuel R
ail #1 Pressure Valve Solenoid
current above normal
Expected Resu
lt:
Oneormoreofthefollowingdiagnosticcodesare
active or rec
ently logged:
•
1779-05 Fuel Rail #1 Pressure Valve Solenoid
current belo
wnormal
•
1779-06 Fuel Rail #1 Pressure Valve Solenoid
current abov
e normal
Results:
•
1779-05 – Proceed to Test Step 3.
•
1779-06 – Pro
ceed to Test Step 7.
•
Not OK – No active diagnostic codes or recently
logged diagn
ostic codes are displayed. STOP.
Test Step 3. Check the Harness for an
Open Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect
P2 from the ECM.
C. Measure 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 circuit.
Repair: Check the high pressure fuel system for
leaks. A mechanical relief valve is installed in the
high press
ure fuel rail. Check that there is no flow
of fuel from the mechanical relief valve. Refer
to Operation and Maintenance Manual, “High
Pressure F
uel Lines”.
If the fuel system is Not OK, repair the fuel system
and restar
t 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.
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