Volvo

Battery voltage is monitored by the circuits within the Engine Control Module (ECM).

Conditions for diagnostic trouble code (DTC):
1) The voltage is more than 19?V

Probable cause
1) Battery charger connected
2) Alternator

Battery voltage is monitored by the circuits within the Engine Control Module (ECM).

Conditions for diagnostic trouble code (DTC):
1) Lower voltage than normal

Probable cause
1) Low battery voltage
2) Voltage supply
3) Ground connection

Battery voltage is monitored by the circuits within the Engine Control Module (ECM).

Conditions for diagnostic trouble code (DTC):
1) The voltage is more than 19?V

Probable cause
1) Battery charger connected
2) Alternator
3) Engine control module (ECM)

Conditions for diagnostic trouble code (DTC):
1) The component is stuck in opened position

Observable symptoms
1) Engine does not reach normal operating temperature

Probable cause
1) The thermostat may have seized in open position if the engine has been warmed up too slowly

Detailed information
1) By comparing calculated and measured coolant temperature on a hot engine, one can determine if engine warm-up occurred sufficiently fast

Conditions for diagnostic trouble code (DTC):
1) The component is stuck in closed position

Observable symptoms
1) High engine coolant temperature (ECT)
2) Drive-abilty effected

Probable cause
1) If the thermostat is stuck in closed position the engine will not be cooled

Detailed information
1) The thermostat may have seized in closed position if the coolant temperature continued to rise at the same rate as the oil temperature

The (VECU) Vehicle Electronic Control Unit supplies and monitors the cranking signal to the starter motor relay. Several types of starter cranking protection are provided so the starter cannot be engaged in unwanted conditions. The starter cranking protection will also limit the maximum cranking time to 18 seconds without cycling the key.

Conditions for diagnostic trouble code (DTC):
1) The starter motor has been activated for too long time
2) Too many tries to start

Observable symptoms
1) Not possible to activate the starter motor during a certain time
2) Text message on the display, Wait to start, and count down

Probable cause
1) Engine is difficult to start
2) Cold ambient temperature
3) Low battery voltage

Detailed information
1) If the diagnostic trouble code (DTC) is set intermittently the starter motor protection is functioning and further fault tracing is not necessary
2) If the diagnostic trouble code (DTC) is set often or at every attempt to start a fault can be suspected. Continue according to symptom fault tracing Difficult starting

The (VECU) Vehicle Electronic Control Unit supplies and monitors the cranking signal to the starter motor relay. Several types of starter cranking protection are provided so the starter cannot be engaged in unwanted conditions. The starter cranking protection will also limit the maximum cranking time to 18 seconds without cycling the key.

Observable symptoms
1) Starter motor does not run

Probable cause
1) Batteries
2) Starter motor solenoid
3) Starter motor
4) Open circuit electric cables
5) The starter pinion does not mesh with the gear ring on the flywheel

The (VECU) Vehicle Electronic Control Unit supplies and monitors the cranking signal to the starter motor relay. Several types of starter cranking protection are provided so the starter cannot be engaged in unwanted conditions. The starter cranking protection will also limit the maximum cranking time to 18 seconds without cycling the key.

Conditions for diagnostic trouble code (DTC):
1) Power take-off activated

Observable symptoms
1) Not possible to activate the starter motor

Probable cause
1) Power take-off switch

Detailed information
1) Put the power take-off switch in off position and try to start again

The (VECU) Vehicle Electronic Control Unit supplies and monitors the cranking signal to the starter motor relay. Several types of starter cranking protection are provided so the starter cannot be engaged in unwanted conditions. The starter cranking protection will also limit the maximum cranking time to 18 seconds without cycling the key.

Conditions for diagnostic trouble code (DTC):
1) Transmission is not in neutral position
2) Gear selector not in neutral
3) Only for automatic transmission

Observable symptoms
1) Not possible to activate the starter motor

Probable cause
1) Transmission
2) Gear selector

Detailed information
1) Put the gear selector in neutral position and try to start again
2) When the vehicle is equipped with manual transmission the parameter code BZN in ECM should be set to 0