PANEL GP-SOUND SUPPRESSION 3843830 - Caterpillar

Illustration 1 g00678674
Schematic of the SPI Data Link
This diagnostic code is recorded if the VIMS electronic control module determines that information on the "keypad data link" is erratic or the information makes no sense.System Response:This condition causes the keypad to operate erratically or the keypad may not function at all.Test Step 1. INSPECT THE HARNESS CONNECTIONS.
Turn the disconnect switch to the OFF position.
Inspect the harness connections that are related to the SPI 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 J1and J2 connectors from the ECM.
Disconnect the machine harness connector from the keypad.
At the machine harness connectors for the ECM, measure the resistance between connector contact J1-1(wire 170-YL(Yellow)) and contact J1-57 (wire C415-WH(White)) of the keypad data input circuit. 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 greater than 5000 ohms. The machine harness has failed.Repair: There is a short between the +battery and the "keypad data input circuit" 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.
The keypad and the ECM remain disconnected from the machine harness.
Measure the resistance of the "keypad input circuit" from connector contact J1-57 (wire C415-WH(White)) to connector contact 3 (wire C415-WH(White)) of the keypad. Expected Result:The resistance is less than 5.0 ohms. Results:
OK - The resistance is less than 5.0 ohms. The circuit resistance is correct. Proceed to test step 4.
- The resistance is greater than 5000 ohms. Repair: There is an open in the machine harness. Repair the machine harness or replace the machine harness.STOPTest Step 4. CHECK FOR A SHORT TO GROUND
The disconnect switch and the key start switch remain in the OFF position.
The ECM and all the keypad remain disconnected from the machine harness.
At the machine harness connector for the ECM, measure the resistance between frame