Fault Codes of Volvo Engine TAD734GE – Part 2

Reason:

• Coolant temperature is too high.

Reaction:

• Engine control module reduces engine power (unless the protection has been  shut off with the VODIA diagnostic tool).

Action:

• Check the coolant level.

• Check the charge air cooler (cleanliness).

• Check if there is air in the cooling system.

• Check the pressure cap on the expansion tank.

• Check coolant temperature sensor function.

• Check thermostat function.

Code 6.2, PID / SPN 105. Charge air temperature

Reason:

• The charge air temperature is too high.

Reaction:

• Engine control module reduces engine power (unless the protection has been   shut off with the VODIA diagnostic tool).

Remedy:

• Check coolant level.

• Check the charge air cooler (cleanliness).

• Check charge air temperature sensor function.

• Check thermostat function.

Code 6.4, SID 231/SPN 639. Data link (CAN), CIU

Reason:

• Faulty data link (CAN), CIU.

Reaction:

• Instruments and warning lamps stop working.

Action:

• Check that the 8-pin connector is not damaged.

• Check that the cables between the CIU and the engine management unit are not damaged.

Code 6.5, SID 231/SPN 639/2017 / PSID 201 Data link (CAN), EMS 2

Reason:

• Internal fault in control module.

Reaction:

• Engine not operating: engine cannot be started. Engine running: engine idles  and can only be stopped with the emergency stop (AUX-stop).

Action:

• Check that the 8-pin connector is not damaged.

• Check that the cables between the CIU and the engine management unit are not damaged.

• Check that sockets 11 and 12 in the connector on the CIU are not damaged.

Code 6.6, PID/SPN 100. Oil pressure

Reason:

• Oil pressure is too low.

Reaction:

• Engine control module reduces engine power (unless the protection has been shut off with the VODIA diagnostic tool).

Action:

• Check oil level.

• Check that the air filters are not blocked.

• Check system pressure valves and safety valves in the oil system.

• Check oil pressure sensor function.

Code 6.9, PID/SPN 158 Battery voltage, CIU

Reason:

• Short circuit to negative (-).

• Faulty alternator.

• Faulty battery, battery cables.

Reaction:

• Problems in engine starting.

Action:

• Check the supply voltage from the control unit.

• Check the battery.

• Check the alternator.

• Check the 8-pin connector.

Code 7.1, SID 1/SPN 651 Injector, cylinder #1

Reason:

• Electrical fault.

• Faulty compression or injector.

Reaction:

• Engine runs on 5 cylinders.

• Abnormal sound.

• Reduced performance.

Action:

• Check that the unit injector cables are not damaged.

• Check that the injector connections are not damaged.

• Check fuel supply pressure.

• Check the valve clearance.

• Perform a compression test and check cylinder #1.

Code 7.2, SID 2/SPN 652 Injector, cylinder #2

Reason:

• Electrical fault.

• Faulty compression or injector.

Reaction:

• Engine runs on 5 cylinders.

• Abnormal sound.

• Reduced performance.

Action:

• Check that the unit injector cables are not damaged.

• Check that the injector connections are not damaged.

• Check fuel supply pressure.

• Check the valve clearance.

• Perform a compression test and check cylinder #2.

Code 7.3, SID 3/SPN 653 Injector, cylinder #3

Reason:

• Electrical fault.

• Faulty compression or injector.

Reaction:

• Engine runs on 5 cylinders.

• Abnormal sound.

• Reduced performance.

Action:

• Check that the unit injector cables are not damaged.

• Check that the injector connections are not damaged.

• Check fuel supply pressure.

• Check the valve clearance.

• Perform a compression test and check cylinder #3.

Code 7.4, SID 4/SPN 654 Injector, cylinder #4

Reason:

• Electrical fault.

• Faulty compression or injector.

Reaction:

• Engine runs on 5 cylinders.

• Abnormal sound.

• Reduced performance.

Action:

• Check that the unit injector cables are not damaged.

• Check that the injector connections are not damaged.

• Check fuel supply pressure.

• Check the valve clearance.

• Perform a compression test and check cylinder #4.

Code 7.5, SID 5 / SPN 655 Injector, cylinder #5

Reason:

• Electrical fault.

• Faulty compression or injector.

Reaction:

• Engine runs on 5 cylinders.

• Abnormal sound.

• Reduced performance.

Action:

• Check that the unit injector cables are not damaged.

• Check that the injector connections are not damaged.

• Check fuel supply pressure.

• Check the valve clearance.

• Perform a compression test and check cylinder #5.

Code 7.6, SID 6/SPN 656 Injector, cylinder #6

Reason:

• Electrical fault.

• Faulty compression or injector.

Reaction:

• Engine runs on 5 cylinders.

• Abnormal sound.

• Reduced performance.

Action:

• Check that the unit injector cables are not damaged.

• Check that the injector connections are not damaged.

• Check fuel supply pressure.

• Check the valve clearance.

• Perform a compression test and check cylinder #6.

Code 8.3, SID 42/SPN 679. Injection pressure, regulator

Reason:

• Faulty cables.

• Faulty actuator.

• Fault in MPROP.

Reaction:

• Engine control unit reduces engine power.

Action:

• Please contact an authorized Volvo Penta workshop.

Code 8.3, PSID 96/SPN 1239 Pressure in Common Rail

Reason:

• Leakage in the high pressure fuel system.

• Leakage in the high pressure supply pipe to the injector.

Reaction:  

• Engine control unit reduces engine power.

Action:

• Please contact an authorized Volvo Penta workshop.

Code 8.3, PSID 97/SPN 679. Pressure valve

Reason:

• Leakage in the PRV (Pressure Release Valve).

• The PRV has stuck closed.

• The PRV has stuck open.

Reaction:

• Engine control unit reduces engine power.

Action:

• Please contact an authorized Volvo Penta workshop.

Code 8.3, PID/SPN 164. Injection pressure

Reason:

• Fault in fuel supply.

• Faulty fuel pump.

• Faulty cables.

• Fault in sensor.

Reaction:

• Warning lamp lights up.

• Engine control unit reduces engine power.

Action:

• Check the cables.

• Check sensor.

• Check the filter.

• Check the fuel pumps.

Code 8.4 PPID 55/SPN 1136 EMS temperature

Reason:

• Electrical fault, damaged sensor.

• Control unit incorrectly installed, too hot. Reaction:

• None

Action:

• Check the control unit installation. Recommended ambient temperature is 50 °C.

Code 9.3, SID 232/221/SPN 620/1079/1080 Voltage supply to sensor

Reason:

• Short circuit.

• Fault in one of the sensors.

Reaction:

• Faulty values in oil pressure and charge air pressure sensors.

• Fault code for oil pressure and charge air pressure sensors.

• Low power.

• Oil pressure and oil temperature instruments show 0.

Action:

• Check that the oil pressure and charge air pressure sensors are not damaged.

• Check the oil pressure sensor and charge air pressure sensor

Code 9.8, SID 254/SPN 629. Fault in control unit, CIU

Reason:

• Faulty EEPROM, CIU.

• Faulty flash memory, CIU.

• Fault in control module, CIU.

Reaction:

• CIU returns to factory setting.

• Engine goes to idle.

• Engine cannot be started.

Action:

•   Re-program the unit.

Code 9.9, SID 240/SPN 639. Memory fault in EMS

Reason:

• Memory fault in engine management system (EMS).

Reaction:

• Engine might not start.

Action:

• Re-program the unit.

Code 9.9, SID 254 / SPN 629. Control unit EMS

Reason:

• Internal fault in control module.

Reaction:

• Engine misfires.

• Engine does not start.

Action:

• Change engine control unit.