Volvo Vehicle Management System (VECTRO II, ECU) Service Manual

Online PDF Volvo Vehicle Management System (VECTRO II, ECU) Service Manual

The descriptions and service procedures contained in this manual are based on designs and methods studies carried out up to June 2001. 
The products are under continuous development. Vehicles and components produced after the above date may therefore have different specifications and repair methods. When this is believed to have a significant bearing on this manual, supplementary service bulletins will be issued to cover the changes.
The new edition of this manual will update the changes.

In service procedures where the title incorporates an operation number, this is a reference to an S.R.T. (Standard Repair Time).
Service procedures which do not include an operation number in the title are for general information and no reference is made to an S.R.T.
The following levels of observations, cautions and warnings are used in this Service Documentation: 

Note: Indicates a procedure, practice, or condition that must be followed in order to 
have the vehicle or component function in the manner intended.
Caution: Indicates an unsafe practice where damage to the product could occur. Warning: Indicates an unsafe practice where personal injury or severe damage to the 
product could occur.
Danger: Indicates an unsafe practice where serious personal injury or death could occur.

American Trucking Association 
ATDC (After Top Dead Center)
top center (normal direction of rotation). The 180 of crankshaft rotation after the piston reaches 

AC (Alternating Current)
An electrical current that alternates level and direction. BTDC (Before Top Dead Center)
top center (normal direction of rotation). The 180 of crankshaft rotation before the piston reaches 

INFO lamp
Light that warns the operator of an active diagnostic fault code; also referred to as the diagnostic lamp.
Data link
An electrical connection for communication with other microprocessor-based devices (such as powertrain control, trip recorders and maintenance systems) that are compatible with the ATA and SAE standard.
Diagnostic fault code
These codes indicate an electronic system malfunction, indicating a problem with the D12 electrical systems.
Diagnostic flash code
Codes flashed out in a series via the INFO lamp to indicate an active fault code.
DC (Direct Current)
An electrical current that flows in one direction only. 
EEPROM (Electrical Erasable Programmable Read Only Memory)
The contents of this type of memory may be electronically erased and new information programmed into the device.
EECU (Engine Electronic Control Unit)
The computer that controls the power supplied to the engine electronics, monitors and governs engine functions.
EUI (Electronic Unit Injector)
An injector pump which is mechanically activated and electronically controlled. It combines metering and injecting in a single unit.
Engine brake disable system
During the time ABS (anti-lock braking system) is active, the engine brake is disabled.

Parameter Identification code.
PTO (Power Takeoff)
Operated with the cruise control switches, this mode permits setting a constant engine rpm when the vehicle is not moving.
PWM (Pulse Width Modulation)
A signal consisting of variable-width pulses at fixed intervals to vary; “TIME ON” versus versus “TIME OFF.”
RAM (Random Access Memory)
A memory that has stored information immediately available when addressed.
Reference voltage
A regulated voltage supplied by the EECU to a sensor, which uses it to generate a signal voltage.
A group of seven alphanumeric characters designed to restrict access to level-2 parameters. The password is automatically defaulted to seven empty spaces if customer has not specified password.
Society of Automotive Engineers.
Short circuit 
A connection of comparatively low resistance, accidentally or intentionally made between two points on a circuit.

Subsystem Identification code.
A voltage value used to transmit information typically from a sensor to the EECU.
Supply voltage
A constant voltage that supplies electrical power to a component. It may be generated by the EECU or supplied by the vehicle battery.
Throttle Position Sensor (TPS)
An electronic sensor that is connected to the accelerator pedal and sends a Pulse Width Modulated signal to the EECU.
Vehicle Specification Programming (VSP)
VSP consists of two levels of programming: engine configuration (level 1) and customer parameters (level 2).
Vehicle Speed Sensor (VSS)
An electromagnetic device that measures vehicle speed from the rotation of gear teeth in the drivetrain of the vehicle.
VEB (Volvo Engine Brake)
Consists of a compression brake (VCB) and an exhaust pressure governor (EPG).

Online PDF Volvo Vehicle Management System (VECTRO II, ECU) Service Manual