PACCAR MX (2004 Emissions) Fault Code: U178D CAN Communication – Message (PROBA_BBM_to_Eng) Out of Range, ESC n Variable from Body Builder Module
PACCAR MX (2004 Emissions) Fault Code: U178D CAN Communication – Message (PROBA_BBM_to_Eng) Out of Range, ESC n Variable from Body Builder Module
SET CONDITIONS:
This DTC is set when a CAN message is received correctly, but the content (signal value or status) is out of the expected range.
DIAGNOSTIC CONDITION:
The diagnostic runs continuously when the ignition is keyed on or when the engine is running.
CORRESPONDING OBD READINESS MONITOR:
None
RESET CONDITION:
The DTC changes to inactive after the diagnostic runs and passes.
REPAIR VERIFICATION:
1. Clear all DTCs.
2. Test drive or operate the vehicle to meet the diagnostic conditions and set conditions.
3. Did the DTC come back?
– No, repair successful
– Yes, repair unsuccessful
POSSIBLE CAUSES:
1. A corrupt or empty CAN message
2. A malfunction in the system from which the message originates
ADDITIONAL INFORMATION:
1. A ‘message out of range’ DTC is activated by the receiving ECU, but indicates a malfunction within another system which communicates with this ECU.
2. The cause of the DTC must be sought in the system from which it originates.
Example:
1. [ECU 1] detects an incorrect or missing signal from [sensor A].
2. [ECU 1] sets [DTC 1] (In this specific case, an open circuit DTC).
3. [ECU 1] constantly informs [ECU 2] about the status of [sensor A] via CAN messages.
4. Since the data received from the sensor is not available or not plausible, an ’empty’ CAN message is sent from [ECU 1] to [ECU 2].
5. [ECU 2] interprets the empty message as being out of the expected range and sets the ‘out of range DTC’ [DTC 2].
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