ADAPTER 8B7553 - Caterpillar

Illustration 1 g02758942
Schematic of the 583T, 587T, PL83, and PL87 Display Power Supply
Illustration 2 g02759037
Schematic of the 572R Series II Display Power SupplyThis diagnostic code is recorded when the ECM does not receive expected information. When the ECM sends information to a display component, the display component sends a signal back to the ECM. The signal confirms correct information. When the ECM does not receive expected information, the diagnostic code is logged. As a result of this diagnostic code, the ECM may not respond to the information that is received. Gauges and readouts could be incorrect when the ECM is in normal mode. Check the connections for the display data link. Check for opens or shorts in the harness wiring for the display data link. Test Step 1. INSPECT THE HARNESS CONNECTIONS.
Turn the disconnect switch to the OFF position.
Inspect the harness connections that are related to the display data link. Make sure that the connectors are clean and tight.
Check the mating of the harness connectors.
Check wires at the connector.
Check each wire for nicks or signs of abrasion in the insulation.
Check for moisture at the connector.
Check for dirty contacts or corroded contacts.
Check each pin and each socket. Expected Result:The machine harness connectors are tight and free of corrosion. Results:
OK - The machine harness connectors are tight and free of corrosion. Proceed to test step 2.
NOT OK - The machine harness connectors are NOT tight and free of corrosion. Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK FOR A SHORT TO +BATTERY
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the harness from the ECM.
Disconnect the machine harness connectors from all of the display components.
At the harness connectors for the ECM, measure the resistance between the contacts that are listed below:
Connector contact 1 (wire 113-OR) and the Display Data Link circuit contact 4 (wire C413-YL).
Connector contact 1 (wire 113-OR) and the Display Data Link circuit contact 5 (wire C414-BU).
Connector contact 1 (wire 113-OR) and the Display Data Link circuit contact 3 (wire E708-PK). Expected Result:The resistance is greater than 5000 ohms.Results:
OK - The resistance is greater than 5000 ohms. Proceed to test step 3.
NOT OK - The resistance is less than 5 ohms. The machine harness has failed.Repair: There is a short between the +battery and the circuits of the display data link in the machine harness. Replace the machine harness or repair the machine harness.STOPTest Step 3. CHECK FOR AN OPEN HARNESS.
The disconnect switch and the key start switch remain in the OFF position.
All the display modules remain disconnected from the machine harness.
Measure the resistance of the circuits of the display data link that are listed below:
Measure the resistance between connector contact 35 (wire C413-YL) to connector contact 4 (wire C413-YL) of the message center module.
Measure the resistance between connector contact 15 (wire C414-BU) to connector contact 5 (wire C414-BU) of the message center module.
Measure the resistance between connector contact 25 (wire E708-PK) to connector contact 3 (wire E708-PK) of the message