CONTROL GP-ENGINE ELECTRONIC 3740758 - Caterpillar

Illustration 5 g01625112
ECM pin locations
(52) CAN B (J1939) Data Link +
(61) CAN B (J1939) Data Link -
Illustration 6 g01625115
Pin locations on the 31-pin MIC
(30) CAN B (J1939) Data Link +
(31) CAN B (J1939) Data Link -
Illustration 7 g01331452
Pin locations on the 70-pin MIC
(52) CAN B (J1939) Data Link +
(61) CAN B (J1939) Data Link -
Illustration 8 g01625117
Pin locations on the diagnostic connector J60 or J80
(F) CAN B (J1939) Data Link -
(G) CAN B (J1939) Data Link +
Turn the keyswitch to the OFF position.
Check the connectors and wiring for the following faults: damage, corrosion, abrasion, and incorrect attachment.
Pay close attention to the following areas:ECM connector J1/P1
P1:52 CAN B (J1939) Data Link +
P1:61 CAN B (J1939) Data Link -31-pin Machine Interface Connector (MIC)
J20:30 CAN B (J1939) Data Link +
J20:31 CAN B (J1939) Data Link -70-pin Machine Interface Connector (MIC)
J20:52 CAN B (J1939) Data Link +
J20:61 CAN B (J1939) Data Link -J60 Diagnostic Connector
J60:A Battery +
J60:B Battery -
J60:F CAN B (J1939) Data Link -
J60:G CAN B (J1939) Data Link +J80 Diagnostic Connector
J80:A Battery +
J80:B Battery -
J80:F CAN B (J1939) Data Link -
J80:G CAN B (J1939) Data Link +Refer to Troubleshooting, "Electrical Connectors - Inspect" for more information.Expected Result:The connectors and wiring should be free of the following faults: damage, corrosion, abrasion, and incorrect attachment.Results:
OK - Proceed to Test Step 6.
Not OK - Repair: Repair the CAN B (J1939) data link circuit. Replace the cables or the connectors that are causing the fault. Ensure that all seals are properly placed and that all connectors are secured correctly.Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.STOPTest Step 6. Check the Battery Voltage at the Diagnostic Connector
Illustration 9 g01625120
Pin locations on the J60 or J80 diagnostic connector
(A) Battery +
(B) Battery -
(F) CAN B (J1939) Data Link +
(G) CAN B (J1939) Data Link -
Turn the keyswitch to the ON position.
Use a multimeter to measure the voltage between the pin A Battery + and pin B Battery - on the diagnostic connector.Refer to Illustration 9.Expected Result:The voltage is between 22.0 Volts DC and 27.0 Volts DC for a 24 Volt system or between 11.0 Volts DC and 13.5 Volts DC for a 12 Volt system.Results:
OK - On engines that connect to a machine CAN bus, proceed to Test Step 7.
OK - On engines that do not connect to a machine CAN bus, proceed to Test Step 9.
Not OK - The diagnostic connector is not receiving the correct voltage.Repair: Inspect the wiring and fuses to the connector. Repair the wiring or batteries and/or replace the wiring or batteries, as required. If the diagnostic connector is part of the machine wiring harness, send the machine to the OEM dealer for repair.Verify that the repair eliminates the fault.STOPTest Step 7. Check for an Open Circuit on a CAN B (J1939) Data Link that is Connected to a CAN Bus on the Application
Turn the keyswitch to the OFF position.
Disconnect the P1 connector from the ECM.
On applications that have a J60 diagnostic connector, measure the resistance