SPACER 3648248 - Caterpillar

MID 87 - Chassis ECMCID 533 - Brake ECMFMI 9 - Abnormal Update Rate
Illustration 1 g02207696
Cat® Data Link circuit
This diagnostic code indicates the "Chassis ECM" does not receive expected information from the "Brake ECM" for more than 5 seconds. This information is transmitted through the Cat® Data Link.The following can cause this code:
Incorrect ECM software
Incorrect ECM
Harness failure
ECM failureSystem Response:
Events are logged against an ECM that cannot be explained directly.
The "Chassis ECM" cannot communicate with the "Brake ECM".
The communication between the two ECM modules is intermittent.Test Step 1. VERIFY PART NUMBERS
Verify that the following part numbers are correct:
"Chassis ECM"
"Chassis ECM" software
"Brake ECM"
"Brake ECM" flash softwareNote: Consult the product business unit 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 the incorrect ECM with a correct ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".Flash the correct software. See Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program".STOPTest Step 2. INSPECT THE HARNESS
Turn off the disconnect switch and the key switch.
Inspect the harness.Clean the harness connector contacts.Inspect the harness connector contacts for corrosion or damage.Inspect the wire insulation for damage caused by heat, corrosion, or chafing.
Perform a 45 N (10 lb) pull test on each circuit wire.
Reconnect all harness connectors.Verify that the connectors are fully seated and the clips are fastened.
Check for intermittent problems. Use Cat® Electronic Technician (Cat® ET) and perform a wiggle test on the harness.Expected Result:The harness is in good condition.Results:
OK - The harness is in good condition. Proceed to Test Step 3.
NOT OK - The harness is not in good condition.Repair: Repair