Perkins M190C Troubleshooting Manual page 175

KENR9126
•
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 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
•
1779-06 Fuel Rail #1 Pressure Valve Solenoid
current above normal
Results:
•
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.
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 pressure fuel rail. Check that there is no flow
of fuel from the mechanical relief valve. Refer
to Operation 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. Disconnect the connector from the fuel rail pump
solenoid.
C. Measure the resistance of the fuel rail pump
solenoid.
Expected Result:
The nominal resistance is less than 1 Ohm.
Results:
•
OK – There is an open circuit or there is an
excessive resistance in 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 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
repair eliminated the fault.
STOP.
•
Not OK – The fuel rail pump solenoid is faulty.
175
Troubleshooting Section