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TitleElectronic Engine Control
File Size670.9 KB
Total Pages19
Table of Contents
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Published: Jan 29, 2007

Electronic Engine Controls Electronic Engine Controls

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Item Part Number Description

1 ECM (engine control module)

2 Fuel pressure sensor

3 Pressure limiting valve

4 Injectors

5 CMP (camshaft position) sensor

6 Glow plugs

7 EGR (exhaust gas recirculation) valve

8 MAP (manifold absolute pressure) sensor

9 Oil pressure switch

10 Fuel pump

11 MAF (mass air flow) /IAT (intake air temperature) sensor

12 CKP (crankshaft position) sensor

13 CHT (cylinder head temperature) sensor

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Each injector is supplied with pressurized fuel from the fuel rail and delivers finely atomized fuel directly into
the combustion chambers. Each injector is individually controlled by the ECM (engine control module) which
operates each injector in the firing order and controls the injector opening period via PWM (pulse width
modulation) signals. Each injector receives a 12V supply from the ECM (engine control module) and, using
programmed injection/timing maps and sensor signals, determines the precise pilot and main injector timing
for each cylinder. If battery voltage falls to between 6 and 9V, fuel injector operation is restricted, affecting
emissions, engine speed range and idle speed. In the event of a failure of a fuel injector, the following
symptoms may be observed:

l Engine misfire
l Idle irregular
l Reduced engine performance
l Reduced fuel economy
l Difficult starting
l Increased smoke emissions.

The ECM (engine control module) monitors the wires for each injector for short circuit and open circuit, each
injector and the transient current within the ECM (engine control module) . If a defect is found, an error is
registered in the ECM (engine control module) for the injector in question.

CHT (cylinder head temperature) SENSOR

The CHT (cylinder head temperature) sensor is located in the top hose at the coolant manifold junction. The
ECT (engine coolant temperature) sensor provides the ECM (engine control module) and the instrument
cluster with engine coolant temperature status.

The ECM (engine control module) uses the temperature information for the following functions:

l Fueling calculations
l Limit engine operation if engine coolant temperature becomes too high
l Cooling fan operation
l Glow plug activation time.

The instrument cluster uses the temperature information for temperature gauge operation. The CHT (cylinder
head temperature) signal is also transmitted on the CAN (controller area network) bus by the instrument
cluster for use by other systems.
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(engine control module) to generator.
l Generator monitor (Alt Mon) communicates the extent of generator current draw to ECM (engine

control module) . This signal also transmits faults to the ECM (engine control module) which will then
sends a message to the instrument cluster on the CAN (controller area network) bus to illuminate the
charge warning lamp.



A = Hardwired; D = High speed CAN (controller area
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Item Part Number Description

1 CKP (crankshaft position)

2 ABS (anti-lock brake system) module

3 Air conditioning compressor

4 EGR (exhaust gas recirculation) valve

5 injectors

6 Turbocharger

7 Clutch switch

8 Glow plugs

9 Glow plug relay

10 Battery

11 Fuel rail pressure sensor

12 Fuel pump

13 Ignition switch

14 BJB (battery junction box)

15 CJB (central junction box)

16 Glow plug relay

17 Brake pedal switch

18 APP (accelerator pedal position)

19 MAF (mass air flow) /IAT (intake air temperature) sensor

20 MAP (manifold absolute pressure) sensor

21 Electric fan relay

22 ECM (engine control module)

23 Cooling fan

24 CMP (camshaft position) sensor
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