LECM Volvo FH4

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U114107

Button in pressed state for 60s

Mechanical Failures

A release event will be sent when a softkey button is detected stuck.

An error event will be sent when a rocker button is detected stuck

Mechanical – Button stuck

Diagnostic Service 14. No additional action is needed.

Check if any ECU button is stuck

Softkey and Rocker Buttons

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U003788

Bus off state

Bus off

No communication on CAN General reduced system functionality

CAN bus short circuit

Diagnostic Service 14. No additional action is needed.

Check cabling and connectors

CAN Communication Cab Net

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U300041

CPU memory corrupted or

un-validated SW

downloaded

General Checksum Failure

Unit will do a reset and stay in boot mode. Re- programming will resolve.

EMC

Diagnostic Service 14. No additional action is needed.

Update SW

Electronic control unit

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U300045

CPU memory read/write error

Program Memory Failure

DTC itself does not affect any functionality. Functional impact depends on each specific case – what actual (EEPROM) data failed to read/write.

Data retention

Diagnostic Service 14. No additional action is needed.

Replace ECU

Electronic control unit

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U300046

Calculated checksum/signature does not match

stored

Calibration / Parameter Memory Failure

Calculated checksum/signature of CPU memory does not match

stored

EMC or wrong handling

Diagnostic Service 14. No additional action is needed.

Update SW

Electronic control unit

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U300049

Can tranceiver/driver failure

Internal Electronic Failure

DTC itself does not inhibit any functionality. Functional impact will be as result of can bus error.

CAN tranceiver error

Diagnostic Service 14. No additional action is needed.

Check cabling and connectors Replace ECU

Electronic control unit

Node

DTC ISO

FailureEvent

FTB_Name

FunctBehaviorDesc

PossibleRootCause

ProcedureEraseConfirmedDtc

ProposedWorkshopAction

ProprietaryName

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U30004B

Measured temperature > 95

degrees C

Over Temperature

Display and button illumination

reduced/switched off.

Ambient temperature too high

Diagnostic Service 14. No additional action is needed.

Check area around ECU for sources of heat. Replace ECU.

Electronic control unit

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U300094

Critical internal SW

error

Unexpected Operation

ECU will reset

Code error / assert

Diagnostic Service 14. No additional

action is needed.

Update SW

Electronic control unit

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U300316

Voltage < 15±1V

Circuit Voltage Below Threshold

If voltage TOO low, ECU operation will suffer.

Normal functionality will

deteriorate.

ECU incorrectly connected. Bad battery/generator.

Diagnostic Service 14. No additional action is needed.

Check supply cabling, battery and generator

Battery Power

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U300317

Voltage > 34±2V

Circuit Voltage Above Threshold

If voltage TOO high for TOO long, ECU may be damaged. Normal functionality will deteriorate.

ECU incorrectly connected. Bad battery/generator.

Diagnostic Service 14. No additional action is needed.

Check battery and generator

Battery Power

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U1FFF68

Truck is in Factory Mode.

Factory mode address parameter is set to value “1”

Event Information

No functionality affected

Whenever P1C54 (Shared Factory mode parameter) is set to TRUE, this DTC shall be set.

Unit not configured correctly when leaving factory.

Diagnostic Service 14. No additional action is needed.

Clear the factory mode parameter.

Factory Mode Active

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U114368

Too many (>29) DTCs with warning indicator bit set are active at the same time.

Event Information

No more DTCs will be reported in diagnostic fault message on CAN.

Maximum limit of DTC’s set in ECU

Diagnostic Service 14. No additional action is needed.

Analyze the other reported DTCs

DTC Notification Max Limit Reached

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