Perkins NJ Series Troubleshooting Manual page 168

168
Troubleshooting Section
Test Step 2. Inspect Electrical Connectors
And Wiring.
Illustration 67
Typical view of the P2 pin locations on the temperature sensor
(37) Ground (GND) Intake Manifold Air
Temperature Sensor
(37) Ground (GND) Coolant Temperature
Sensor
A. Thoroughly inspect ECM engine harness
connector P2 and the suspect sensor connector.
Refer to Troubleshooting, "Electrical Connectors
- Inspect".
B. Perform a 45 N (10 lb) pull test on each of the
wires in the sensor connector and the ECM
connector that are associated with the active
diagnostic code.
Refer to illustration 67.
C. Verify that the latch tab of the connector is
correctly latched. Also verify that the latch tab of
the connector has returned to the fully latching
position.
D. Check the screw for the ECM connector for the
correct torque of 5.0 N·m (44 lb in).
E. Check the harness for abrasions and for pinch
points from the sensor to the ECM.
Expected Result:
All connectors, pins, and sockets should be
completely coupled and/or inserted. The harness
should be free of corrosion, abrasion, and pinch
points.
(42) Signal (SIG) Intake Manifold Air
Temperature Sensor
(43) Signal (SIG) Coolant Temperature
Sensor
Results:
• OK – Proceed to Test Step 3.
•
Not OK – 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. Clear all inactive diagnostic codes. Verify
that the repair has eliminated the fault. Proceed to
Test Step 3 if the fault has not been eliminated.
Test Step 3. Verify That The Diagnostic
Code Is Still Active.
A. Turn the keyswitch to the ON position.
Note: Wait at least 10 seconds for activation of the
diagnostic codes.
B. Access the "Active Diagnostic Code" screen on
C. Determine if the fault is related to an Voltage
the Perkins EST and check for active diagnostic
codes.
Above Normal diagnostic code or a Voltage Below
Normal diagnostic code.
SENR9982-01
g01170936