BASIC KNOWLEDGE REQUIRED (Contd.)
- Electronic Foot Pedal Assembly: Contains the Throttle Position Sensor.
- Electronic Unit Injector: Replaces the Mechanical Unit Injector (MUI).
- Fuel Pressure Sensor: Monitors Fuel Pressure at the Fuel Spill.
- Fuel Temperature Sensor: Monitors fuel temperature at the output of the secondary filter.
- Ground: Battery -
- Injector (fuel)
- Not available at this time.
- Oil Pressure Sensor: Monitors oil pressure at the main oil gallery.
- Oil Temperature Sensor: Monitors oil temperature in the turbo oil supply line
- Power Control Switch
- Pressure Governor Control: Regulates engine speed to maintain a selected external pressure.
- Pulsewidth: The amount of time in crank degrees that the ECM is requesting the injectors be turned on.
- Stop Engine" Light: Typically mounted on the instrument panel. Its main function is to turn on and warn
the driver when a potential engine damaging condition has been detected (low oil pressure. low coolant,
or engine overtemperature). As a light bulb check & system check. the "Stop Engine light will come on
for about 5 seconds when the Ignition turns on.
- Synchronous Reference Sensor: Detects when the first cylinder in the firing order is about to be fired.
- Turbo Boost Sensor: Used to monitor turbo boost pressure This sensor generates a voltage (from 0 to 5
volts) which is proportional to pressure.
- Tachometer Driver: One of two outputs of the ECM for electronic tachometers and/or data loggers.
- Throttle Position Sensor: Used to detect throttle request.
Timing Reference Sensor: Detects whenever any cylinder is about to be fired.
- Two Speed Governor Switch Detects when the vehicle is in top gear.
- Vehicle Identification Number
- Vehicle Speed Sensor: Used to detect vehicle (road) speed.
Vehicle Speed Sensor. Open Collector: An ECM input which must be used in addition to the VSS positive
Input when certain types of vehicle speed sensors are used. (Refer to the application manual for a
particular installation. )
E. GENERAL DIAGNOSTIC INFORMATION
When the Diagnostic Request terminal (pin M on the DDL connector) is grounded to pin A on the DDL connector, the
diagnostic system will flash the yellow "Check Engine" light located in the cab. (More information on retrieving codes is
given in Section 3C.) The light will be flashing a diagnostic code indicating the problem area.
As a bulb and system check. the "Check Engine and Stop Engine lights will come on for 5 seconds when the ignition
switch is first turned "on". The Cruise Active light will also turn on for 5 seconds if a DDEC cruise control is present. If the
Diagnostic Request terminal (DREQ) is then grounded, the "Check Engine light will flash a Code 25 which indicates the
self-diagnostic system is working and that no faults have been detected. A Code 25 consists of two flashes followed by a
short pause. then five flashes in quick succession. After a longer pause, the code will repeat.
If the Check Engine" light remains on, the self-diagnostic system has detected a fault. If the Diagnostic Request terminal
is then grounded and the engine is not running. the trouble code will be flashed. Diagnostic codes will flash in numerical
order (i.e., lowest number code first). The diagnostic code series will repeat as long as the diagnostic request terminal is