INJECTOR AS-FUEL 4828434 - Caterpillar

Illustration 1 g02548140
Cat® data-link circuit
This diagnostic code is recorded when the VIMSTM 3G Main ECM does not receive Color Multi Purpose Display (CMPD) information at the correct rate. The information is communicated through the Cat® data-link.System Response:This failure results in events logged against the VIMS 3G Main ECM that cannot be explained. The VIMS 3G Main ECM cannot communicate with the CMPD or the VIMS 3G Main ECM communicates intermittently.Test Step 1. VERIFY HARDWARE AND SOFTWARE PART NUMBERS
Verify that the following are correct:
VIMS 3G Main ECM software part number
VIMS 3G Main ECM part number
CPMD part number Note: Consult the business unit that produces the product for the correct part numbers.Expected Result:All part numbers are correct. Results:
OK - All part numbers are correct. Proceed to Test Step 2.
NOT OK - All part numbers are not correct.Repair: Replace components that have incorrect part numbers. If you replaced an ECM, flash the correct software. See , "Electronic Control Module (ECM) - Flash Program".STOPTest Step 2. INSPECT THE HARNESS
Turn off the disconnect switch.
Inspect the Cat data-link portion of the harness for the following:
Connections are clean and tight
Connectors mate properly
Seals are in place
Signs of damage
Wires are tight in the connectorNote: Take care not to pull the wire out of the connector.
Check the connectors for the following:
Moisture
Dirty contacts
Corroded contacts
Proper pin installation
Proper matingExpected Result:The harness passes inspection.Results:
OK - The harness passes inspection. Proceed to Test Step 3.
NOT OK - The harness does not pass inspection.Repair: Repair or replace the harness. STOPTest Step 3. CHECK FOR SHORTS TO GROUNDThe disconnect switch remains off.
Disconnect all ECMs from the Cat data-link.
Measure the resistance between frame ground and the following VIMS 3G Main ECM connector contacts:
8 (wire 893-GN(Green))
9 (wire 892-BR(Brown))Expected Result:The resistance is greater than 5000 ohms. Results:
OK - The resistance is greater than 5000 ohms. Proceed to Test Step 4.
NOT OK - The resistance is less than 5000 ohms. There is a short between frame ground and the harness.Repair: Repair or replace the harness. STOPTest Step 4. CHECK FOR SHORT TO +BATTERYThe disconnect switch remains off and all related ECMs remain disconnected.
Measure the resistance between the following CMPD connector contacts:
USB 7 (wire 893-GN(Green)) and Power 11 ((wire 134-YL(Yellow)).
USB 8 (wire 892-BR(Brown)) and Power 11 ((wire 134-YL(Yellow)). Expected Result:The resistance is greater than 5000 ohms. Results:
OK - The resistance is greater than 5000 ohms. Proceed to Test Step 5.
NOT OK - The resistance is less than 5000 ohms. There is a short between the +battery and the harness.Repair: Repair or replace the harness. STOPTest Step 5. CHECK FOR OPEN HARNESSThe disconnect switch remains off and all related ECMs remain disconnected.
Measure the resistance between the following connector contacts:
VIMS Main 3G ECM 8 (wire 893-GN(Green)) and CMPD USB 7 (wire 893-GN(Green)).
VIMS Main 3G ECM 9 (wire 892-BR(Brown)) and CMPD USB 8 (wire 892-BR(Brown)).Expected Result:The resistance is less than 5 ohms. Results:
OK - The resistance is less than 5 ohms. Proceed to Test Step 6.
NOT OK - The resistance is greater than 5 ohms. The harness is open.Repair: Repair or replace the harness.