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Engine control module
General
The Lucas DPI-N is an integrated engine management system. The system is used in the S40/V40 diesel which uses the diesel engine already in use in the 400–series.
The engine control module (ECM) controls:
-injection timing
-the EGR system
-idle speed control
-glow plug preheating and post-heating
-air conditioning (A/C) compressor.
The engine control module (ECM) controls injection timing but not the quantity of the fuel injected. The quantity of fuel injected is governed by pump speed and boost pressure.
The control module exchanges information with:
-the Volvo system tester (ST) via the data link connector (DLC).
The engine control module (ECM) has an on-board diagnostic (OBD) system to record diagnostic trouble codes (DTCs). The engine control module (ECM) can be diagnosed using the Volvo system tester (ST) via the data link connector (DLC).
The engine control module (ECM) is located behind the center console in the same position as the Fenix control module in gasoline driven models.
List of input signals
Overview

The engine control module (ECM) (1) not only controls injection timing it is a complete engine management system.
Engine speed (RPM) sensor (2)
This provides TDC and engine speed (RPM) data and is used for:
-injection timing
-glow plug post-heating period
-tachometer.
Intake air temperature (IAT) sensor (3)
This provides information about intake air temperature (IAT) and is used for:
-controlling the EGR system.
Injector 1 (8)
This indicates injection timing in cylinder #1 and is used for:
-actual injection timing (feedback).
Accelerator pedal (AP) sensor (5)
This provides the engine control module (ECM) with information about engine load and is used for:
-controlling the EGR system
-setting glow plug preheating and post-heating periods
-switching the air conditioning (A/C) compressor on and off.
The instrument (7)
This indicates vehicle's road speed and is used for:
-switching the air conditioning (A/C) compressor on and off at low road speeds.
Altitude sensor (1)
This is integrated with the engine control module (ECM) and is used for:
-setting glow plug preheating and post-heating periods
-controlling the EGR system.
Engine coolant temperature (ECT) sensor (4)
This indicates engine coolant temperature (ECT) and is used for:
-setting glow plug preheating and post-heating periods
-controlling engine idling speed.
The air conditioning (A/C) switch (6)
This is located in the heater control panel and indicates if the air conditioning (A/C) is switched on. It is used for:
-controlling engine idling speed
-switching the air conditioning (A/C) compressor on and off.
List of output signals
Overview

The control module (1) transmits the following output signals.
Idle control valve (2)
This controls engine idling speed. Engine idling speed depends on:
-engine coolant temperature (ECT)
-position of the air conditioning (A/C) switch.
EGR control valve (3)
This controls the EGR system. The control is dependent on:
-engine speed (RPM)
-engine coolant temperature (ECT)
-engine load
-outside air temperature
-atmospheric pressure.
Air conditioning (A/C) relay (10)
This controls the air conditioning (A/C) compressor (11) as a function of:
-the position of the air conditioning (A/C) switch
-vehicle speed
-engine load
-engine coolant temperature (ECT).
Injection timing valve (4)
This controls injection timing, as a function of:
-engine speed (RPM)
-the current injection time
-engine load
-engine coolant temperature (ECT).
Glow relay (8)
This controls preheating and post-heating periods. The relay controls the two sets of glow plugs (9) as a function of:
-engine load
-engine speed (RPM)
-engine coolant temperature (ECT)
-atmospheric pressure
-time elapsed.
Glow plug warning lamp (6)
The lamp in the dashboard is lit during the preheat phase.
Malfunction indicator lamp (MIL) (7)
The lamp on the dashboard lights up if the control module detects a fault in the:
-engine speed (RPM) sensor
-needle lift sensor
-load sensor
-injection timing valve.
Tachometer (5)
The tachometer (5) on the dashboard indicates engine speed (RPM).
Data link connector (DLC) (12)
The engine control module (ECM) has a diagnostic interface with the data link connector (DLC).