Perkins 1106D Troubleshooting Manual page 109

KENR6201-01
Results:
•
OK – Proceed to Test Step 2.
•
Not OK
Repair: Perform the following repair:
Repair the connectors and/or the wiring, or replace
the connectors and/or the wiring. 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 eliminates the fault.
STOP.
Test Step 2. Check the Data Link
Terminating Resistance
A. Disconnect the P1 connector from the ECM.
B. Measure the resistance between P1:20 and P1:21.
Expected Result:
The resistance is between 50 and 70 Ohms.
Results:
•
Result 1 – The resistance is between 50 and 70
Ohms. This is the correct resistance. The fault may
be in the connection to other devices on the data
link. Proceed to Test Step 3.
•
Result 2 – 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 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 eliminates the fault.
STOP.
•
Result 3 – 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.
This document is printed from SPI². Not for RESALE
Measure the resistance of the two terminating
resistors.
If one of the terminating resistors is incorrect,
replace the faulty terminating resistor.
If the two terminating resistors are between 50 and
70 Ohms, proceed to Test Step 4.
• Result 4 – The resistance is greater than 150
Ohms. There may be a break in the harness.
Proceed to Test Step 3.
Test Step 3. Check the Data Link Wiring
A. Disconnect each of the connectors that connect
other devices on the data link.
B. Use a multimeter in order to measure the
resistance between P1:20 to each of the CAN+
pins that connect other devices on the data link.
C. Use a multimeter in order to measure the
resistance between P1:21 to each of the CAN-
pins that connect other devices on the data link.
D. Use a multimeter in order to measure the
resistance between P1:22 to each of the CAN
SHIELD pins that connect other devices.
Expected Result:
The resistance of each wire is less than 2.0 Ohms.
Results:
• OK – The resistance is less than 2.0 Ohms.
Proceed to Test Step 4.
•
Not OK – Some resistances are more than 2.0
Ohms.
Repair: Repair the connectors or the harness
and/or replace the connectors or the harness.
Ensure that all 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 4. Check the Other Devices on
the J1939 Data Link
A. Use the appropriate service tools in order to
diagnose other devices on the data link.
Expected Result:
The other devices are working correctly.
109
Troubleshooting Section