Table 150
Troubleshooting Test Steps
Values Results
1. Use the ““System Communication Status to Check the Sta-
tus of the Other Devices on the Suspect CAN Data Link””
A. In the electronic service tool, click the “Diagnostics” tab on the
tool bar.
B. Select the “System Communication Status” option from the
drop-down list.
Note: The Aftertreatment #1 Intake NOx Level Sensor is dis-
played as Aftertreatment #1 Information #1 in some versions of
software.
Component
Identified
Result: One or more of the devices on the suspect data link
is not visible on the electronic service tool.
Repair: Thoroughly inspect the electrical connectors for the
suspect devices
Refer to Troubleshooting, “Electrical Connectors - Inspect”.
Check the power supply to the suspect devices.
If necessary, refer to Troubleshooting, “Electrical Power
Supply - Test”.
Inspect the wiring between any suspect devices and the
ECM for abrasions and pinch points. If necessary, repair the
wiring.
If the suspect device is the DCU, check the ignition key-
switch line between the DCU and the ECM, and between
the DCU and tank header unit for continuity. Make any nec-
essary repairs. If necessary, refer to Troubleshooting, “DEF
Control Module Power - Test” for the correct procedure to
check between DCU and ECM.
To check between the DCU and the DEF tank header unit,
use the following procedure:
A. Disconnect the harness at the DEF tank header.
B. Disconnect the harness at the DEF tank header.Turn the
keyswitch to the ON position.
C. Measure the voltage between terminals 3 and 4.
D. Turn the keyswitch to the OFF position.
If the fault has been resolved, return the engine to service.
If the fault is still present, proceed to Test Step 2.
Result: All devices are visible on the electronic service tool.
Proceed to Test Step 2.
2. Check the Data Link Terminating Resistance
A. Disconnect the P1 connector from the ECM.
B. Measure the resistance between P1:25 and P1:26.
C. Measure the resistance between the P1:17 and P1:18.
Between 50
Ohms and 70
Ohms
Result: The resistance is less than 50 Ohms - there is a
short circuit in the harness.
Repair: Repair the connectors or the harness and/or replace
the connectors or the harness. Ensure that all the seals are
correctly in place and ensure that the connectors are cor-
rectly connected.
Use the electronic service tool to clear all logged diagnostic
codes and then verify that the repair eliminates the fault.
Result: The resistance is between 110 and 130 Ohms - one
of the terminating resistors may have failed.
Repair: Locate the two terminating resistors and remove the
two terminating resistors from the harness. Depending on
the application, one or both of the terminating resistors may
be located in other ECMs on the data link.
Measure the resistance of the two terminating resistors.
(continued)
274 UENR4469-36
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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