Volvo TAD Diesel Engine Fault Codes

Cause

Reaction

Remedy

• Faulty data link

• None

• Check that the 8-pin connector

is not damaged

• Check that the cables

between the CIU/DCU and

the engine management unit

are not damaged

Power Supply to Sensor (Code 9.3, SID 211, 232/SPN 1080, 1079)

Cause

Reaction

Remedy

• Shortcut

• Fault in sensor

• Faulty values in oil pressure

and boost pressure sensors

• Fault code for oil pressureand

boost pressure sensor

• Low engine output

• The instrument shows zero oil

pressure and boostpressure

• Check that the cable harness

to oil pressure and boost

pressure sensor has not been

damaged

• Check oil pressure and boost

pressure sensors

Power Supply to Sensor (Code 9.3, SID 211/232, SPN 1079/1080)

Cause

Reaction

Remedy

• Shortcut

• Fault in sensor

• Faulty values in oil pressure

and boost pressure sensors

• Fault code for oil pressureand

boost pressure sensor

• Low engine output

• The instrument shows zero oil

pressure and boost pressure

• Check that the cable harness

to oil pressure and boost

pressure sensor has not been

damaged

• Check oil pressure and boost

pressure sensors

Power Supply Sensor (Code 9.3, SID 232/SPN 620)

Cause

Reaction

Remedy

• Shortcut

• Fault in sensor

• Faulty values in oil pressure

and boost pressure sensors

• Fault code for oil pressureand

boost pressure sensor

• Low engine output

• The instrument shows zero oil

pressure and boost pressure

• Check that the cable harness

to oil pressure and boost

pressure sensor has not been

damaged

• Check oil pressure and boost

pressure sensors

Data Set Memory EEPROM, CIU (Code 9.8, SID 253/SPN 630)

Cause

Reaction

Remedy

• Internal fault in control module

• Programming faulty

• Engine does not start

• Re-program the control module.

Fault in Control Unit, CIU (Code 9.8, SID 254/SPN 629)

Cause

Reaction

Remedy

• Faulty EEPROM, CIU

• Faulty flash memory, CIU

• Fault in control module, CIU

• CIU returns to factory setting

• Engine goes to idle

• Engine can not be started

• Re- program the unit

Memory Fault EMS (Code 9.9, SID 240/SPN 628)

Cause

Reaction

Remedy

• Memory fault in engine management system

• Engine might not start

• Re-program the unit

Data Set Memory EEPROM, EMS (Code 9.9, SID 253/SPN 630)

Cause

Reaction

Remedy

Internal fault in control module

Internal fault in control module

• Engine does not start

• Re-program the control module.

If the fault remains,

change the control module

Control Module EMS (Code 9.9, SID 254/SPN 629)

Cause

Reaction

Remedy

• Internal fault in control module

• Engine misfires

• Engine does not start

• Change engine control unit

Wastegate (SID 32/SPN 1188)

Cause

Reaction

Remedy

• Short circuit to positive (+) or

negative (-)

• Open circuit

• Wastegate damaged

mechanically

• Warning lamp lights up

• Engine control unit limits

engine power

• Check that the wastegate

connector is properly

mounted

• Check that the wiring to the

wastegate is not damaged

• Check that the wastegate is

correctly mounted

• Check the wastegate

Fan, rpm sensor (PID 26/SPN 975)

Cause

Reaction

Remedy

• Open circuit

• Warning lamp lights up

• Check that the fan actuator is

properly mounted

• Check that the wiring to the

fan actuator is not damaged

• Check that the fan actuator is

correctly mounted

• Check the fan actuator

Fan actuator (SID 33/SPN 975)

Cause

Reaction

Remedy

• Short circuit to positive (+) or

negative (-)

• Open circuit

• Fan actuator damaged

mechanically

Warning lamp lights up

• Check that the fan actuator is

properly mounted

• Check that the wiring to the

fan actuator is not damaged

• Check that the fan actuator is

correctly mounted

• Check the fan actuator