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Figure 8.14 Engine Control System Components
1. Engine Preheater (EPH)
2. Engine Coolant Temperature Sensor (ENCT)
(Behind Engine Preheater)
3. Rack Position Sensor (RPS)
4. Fuel/Speed Actuator (FSA)
5. Engine Speed Sensor (ENSSN)
6. Engine Oil Pressure Switch (ENOPS)
7. Engine Control Unit (ENCU)
- - - - -
8.5.12
Engine Control System
The engine is controlled by six components (see
): the engine control unit (ENCU), the fuel/
speed actuator (FSA) the engine speed sensor
(ENSSN), the rack position sensor (RPS), the engine
oil pressure switch (ENOPS) and the Engine Coolant
Temperature Sensor (ENCT).
The ENCU starts, stops and controls the speed of the
engine by varying the position of the FSA rod. It also
provides oil pressure, coolant temperature, engine load
and speed signals to the control system via the CAN.
The FSA combines the fuel shutoff solenoid and speed
control solenoid into one component. Opening and
closing the fuel rack (throttle) in accordance with sig-
nals from the ENCU.
The ENSSN provides the speed signal to the ENCU.
The ENOPS is connected to the engine oil pump outlet.
It provides an open or closed signal to the ENCU.
The RPS provides the position of the rack to the
ENCU.
The ENCT provides the engine coolant temperature
signal to the ENCU.
If any of these components is not functioning correctly,
the corresponding alarm will be activated.
8.5.13
Rack Position Sensor (RPS) Calibration
The Rack Position Sensor calibration procedure is a
software function that can only be initiated in Techni-
cian Mode. This calibration procedure should be per-
formed after replacing the Engine, the ECU, or the
Rack Position Sensor.
To Start the Rack Position Sensor Calibration Proce-
dure:
1. Put the system into Technician Mode, refer to
.
2. Select Component Calibration Mode Soft key.
3. Press “=” to start the Rack Position Sensor cali-
bration.
During the calibration process, the display will show the
Engine Load %, RPMs, current calibration offset (the
offset in the Engine ECU), and calibration status.
The Rack Position Sensor is calibrated at an engine
speed of 1700 - 1780 RPM. In order to reach the
required engine speed, the system will incrementally
increase engine load in the following order:
Low Speed - Compressor Start - High Speed - Heater 1
On – Heater 2 On – (3 minutes) – Economized Mode.
If, after placing the system in Economized Mode for
180 seconds, engine speed is not high enough to cali-
brate the sensor (1700 – 1780 RPM), the system will
indicate that the load is too low for calibration. In this
case you will have to manually increase the system
load by blocking the condenser coil. Once the load is
increased enough for the engine to reach calibration
RPM, the calibration should complete successfully.
After the calibration process is finished, the system will
indicate that the calibration was successful, and the
engine will shut down.
8.5.14
Cooling System
a. Cleaning and Flushing
Air flows through the condenser and then the radiator.
The cooling surfaces must be clean and the interior of
the radiator must be clean for adequate cooling.
NOTICE
Use only ethylene glycol anti-freeze (with
inhibitors) in system as glycol by itself
will damage the cooling system. Always
add pre-mixed 50/50 anti-freeze and water
to radiator / engine. Never exceed more
than a 60% concentration of anti-freeze.
Use a low silicate anti-freeze meeting GM
specifications GM 6038M for standard life
coolant or use Texaco Havoline extended
life coolant or any other extended life
coolant which is Dexcool approved and
has 5/150 (5 years / 150,000 miles) on the
label.
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