5130, 5130B and 5230 Excavators, 784B, 785B, 785C, 789B, 789C, 793B and 793C Off-Highway Truck/Tractors and 992G, 994 and 994D Wheel Loaders Vital Information Management System (VIMS) Caterpillar

CID 0820 FMI 03 Keypad Data Link Voltage Above Normal - Test

Usage:

793B 1HL

This diagnostic code is recorded when the VIMS main module reads the voltage of the Keypad data link and the voltage is above normal.

DISCONNECT THE KEYPAD.
1. Disconnect the machine harness from the keypad.
2. Check whether the diagnostic code CID 0820 FMI 03 is active.
  Expected Results:The diagnostic CID 0820 FMI 03 is active.
  Results:
  - OK - Diagnostic code remains active. The fault CID 0820 FMI 03 is present. Proceed to 2.
  - NOT OK - Diagnostic code is no longer present. CID 0820 FMI 03 is no longer present on the message center. Reconnect the keypad to the machine harness. Check for the fault CID 0820 FMI 03. If the fault is present replace the keypad. STOP.
CHECK FOR SHORT TO +BATTERY
1. Turn the disconnect switch to the OFF position and the key start switch to the OFF position.
2. Disconnect the machine harness from the VIMS main module. Disconnect the machine harness from the VIMS keypad module.
3. measure the resistance at the machine harness connector for the VIMS main module between +battery contact 1 and the Keypad Data Link circuit connector contact 29.
  Expected Results:The Resistance is greater than 5000 ohms.
  Results:
  - OK - Resistance is greater than 5000 ohms. The harness circuit resistance is correct. Proceed to Step 3.
  - NOT OK - Resistance is less than 5000 ohms. The machine harness has failed. The Keypad data link is shorted to the +battery circuit. Repair the machine harness or replace the machine harness. STOP.
CHECK FOR OPEN HARNESS
1. The disconnect switch remains in the OFF position and the key start switch remains in the OFF position.
2. The keypad remains disconnected from the machine harness.
3. Check the continuity of the Keypad data link circuit in the machine harness. Measure the resistance between the connector of the VIMS main module to the connector of the VIMS keypad module.
  Expected Results: There is continuity.
  Results:
  - OK - Circuit has continuity. The Keypad data link circuit in the machine harness is correct. The VIMS main module has failed. Replace the VIMS module. Refer to the section Testing and Adjusting, "Module-Replace". STOP.
  - NOT OK - Circuit has NO continuity. The machine harness has failed. The Keypad data link circuit is open in the machine harness. Repair the machine harness or replace the machine harness. STOP.