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Fichas Ecu

The document provides instructions for checking the engine control unit of a vehicle. It involves measuring voltage and resistance values at various connector points and comparing them to expected values while the control unit is connected and disconnected. The purpose is to check that the control unit and associated wiring and sensors are functioning properly. Key steps include checking for expected voltages from sensors and supplies with the control unit connected and idle, and checking sensor and injector resistances with the control unit disconnected. Any values that do not match the expected ranges would indicate a faulty component.

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187 views7 pages

Fichas Ecu

The document provides instructions for checking the engine control unit of a vehicle. It involves measuring voltage and resistance values at various connector points and comparing them to expected values while the control unit is connected and disconnected. The purpose is to check that the control unit and associated wiring and sensors are functioning properly. Key steps include checking for expected voltages from sensors and supplies with the control unit connected and idle, and checking sensor and injector resistances with the control unit disconnected. Any values that do not match the expected ranges would indicate a faulty component.

Uploaded by

cianeto lite
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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sb41152_motor Page 1 of 7

28108-3 Engine control unit, check

Vehicle: Chassis ID: Mileage: Customer:

Engine variant: Engine number: Control unit, part Control unit, serial number:
number:

Software number: Data set 1: Data set 2:

Step 1: Checking the system.


Conditions:

Adapter 9990014 and breakout box 9998699 connected between the control unit and the cable harness.
Control unit connected
Ignition key in drive position
Engine switched off
Measuring mode DC voltage with multimeter 9812519
Ubat = Battery voltage.
> = More than
< = Less than
≈ = Approx equal to

Note: If the values in general do not agree, check the common earth connections EA11, EB17, EB18, EB58, EB59,
EB61 and EA57.

Connector Signal type Measurement Expected value Measured Note


points value
EA3 Fuel pump EA3 - EA57 ≈ 0.8 * Ubat (inactive)
≈ 0 V (active)
EA7 Supply to sensor (5 V) EA7 - EA57 4.80 -5.15 V
EA21 EGR pressure EA21 - EA11 0.5 V
EA22 Boost pressure sensor, EA22 - EA11 1.10.7 V (at 0 m above
signal sea level.)

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Connector Signal type Measurement Expected value Measured Note


points value
EA30 EGR temperature sensor, EA30 - EA11 ≈ 4.9 V (+20C)
signal
EA31 Oil temperature sensor, EA31 -EA11 ≈ 3.0 V (+20C)
signal ≈ 0.4 V (+100C)
EA35 Fan speed sensor EA35 - EA39 0 – 5 V Rotate the fan
by hand. The
value should
vary between 0
- 5 V.
EA47 Boost air temperature EA47 - EA11 ≈ 2.6V (+20C)
sensor, signal ≈ 1.6 V (+40C)

Connector Signal type Measurement Expected value Measured Note


points value
EB11 Oil pressure sensor, EB11 - EB18 ≈ 0.5 V (for
signal stationary engine)
EB15 Buffered idle switch EB15 - EB59 < 4 V (inactive)
> 8 V (active, i.e.
with depressed
accelerator)
EB16 Fuel pressure sensor, EB16 - EB18 ≈ 0.5 V (for
signal stationary engine)
EB17 Supply to sensor (5 V) EB17 - EB18 ≈5V
EB23 Coolant level sensor, EB23 - EB10 ≈ 0.9 * Ubat (open) Normally open
signal ≈ 0 V (closed) with the starter
key in drive
position.

EB24 EGR position 1 EB24 - EB18 ≈ 0.2 - 0.8V (closed


valve)
EB25 Pre-heating relay EB25 -EB59 Ubat(open)
0 V (closed)
EB27 Coolant temperature EB27 -EB18 ≈ 3.0 V (+20C)
sensor, signal ≈ 0.6 V (+85C)
EB28 Crankcase pressure EB28 - EB18 2.90.6 V (at 0 Engine
sensor m.a.s.l.) stationary

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EB30 VCB EB30 - EB61 Ubat (inactive) Normally


0 V (active) inactive with
the ignition key
in the drive
position.

EB38 EPG EB38 - EB59 ≈ Ubat (inactive) Normally


≈ 0 V (active) inactive with
the ignition key
in the drive
position.
EB49 Fan control EB49 - EB59 ≈ Ubat (inactive) The fan is
≈ 0 V (active) connected
when the fan
connection
relay is
inactive.
The fan is
disconnected
when the fan
connection
relay is active.
EB51 SAE J1939 (CAN high) EB51 - EB61 2.5 - 4.0 V
EB55 SAE J1939 (CAN low) EB55 - EB61 0 - 2.5 V
EB57 Power supply, control unit EB57 - EB59 Ubat
EB60 Power supply, control unit EB60 - EB61 Ubat

Step 2: Function check (Cable harness and circuit)


Conditions:

Adapter 9990014 and breakout box9998699 connected to cable harness.


Control unit disconnected
Ignition key in stop position
Measuring mode resistance with multimeter 9812519

Connector Signal type Measurement Expected value Measured Note


points value
EA3 Fuel pump EA3 - EA57 > 10Ω

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EA12 Unit injector cylinder 2 EA12 - EA62 0.9 - 5.2 Ω (20C)


(injector) 1.5 - 5.8 Ω (100C)
EA16 Unit injector cylinder 2 EA16 - EA59 1.1 - 5.8 Ω (20C)
(return valve) 1.9- 6.2Ω (100C)
EA20 Unit injector cylinder 1 EA20 - EA62 0.9 - 5.2 Ω (20C)
(injector) 1.5 - 5.8 Ω (100C)
EA24 Unit injector cylinder 1 EA24 - EA59 1.1 - 5.8 Ω (20C)
(return valve) 1.9- 6.2Ω (100C)
EA28 Unit injector cylinder 3 EA28 - EA62 0.9 - 5.2 Ω (20C)
(injector) 1.5 - 5.8 Ω (100C)

EA30 EGR temperature sensor EA30 - EA11 30 – 45kΩ


EA31 Oil temperature sensor, EA31 -EA11 ≈ 1.9 kΩ (+20C)
signal ≈ 100 Ω (+100C)
EA32 Unit injector cylinder 3 EA32 - EA59 1.1 - 5.8 Ω (20C)
(return valve) 1.9- 6.2Ω (100C)

EA36 Unit injector cylinder 6 EA36 - EA61 0.9 - 5.2 Ω (20C)


(injector) 1.5 - 5.8 Ω (100C)
EA37 Tachometer flywheel, + EA37 - EA38 775 - 945 Ω
EA40 Unit injector cylinder 6 EA40 - EA60 1.1 - 5.8 Ω (20C)
(return valve) 1.9- 6.2Ω (100C)

EA41 Tachometer turbo EA41 - EA42 0.8 - 1 kΩ


EA44 Unit injector cylinder 5 EA44 - EA61 0.9 - 5.2 Ω (20C)
(injector) 1.5 - 5.8 Ω (100C)
EA45 Camshaft sensor, + EA45 - EA46 775 - 945 Ω
EA47 Boost air temperature EA47 - EA11
sensor, ≈ 6.2 kΩ (+20C)
signal ≈ 2.5 kΩ (+40C)
EA48 Unit injector cylinder 5 EA48 - EA60 1.1 - 5.8 Ω (20C)
(return valve) 1.9- 6.2Ω (100C)
EA52 Unit injector cylinder 4 EA52 - EA61 0.9 - 5.2 Ω (20C)
(injector) 1.5 - 5.8 Ω (100C)
EA56 Unit injector cylinder 4 EA56 - EA60 1.1 - 5.8 Ω (20C)
(return valve) 1.9- 6.2Ω (100C)

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Connector Signal type Measurement Expected value Measured Note


points value
EB3 Oil level sensor EB3 - EB4 11.7 - 12.9 Ω (≈
+22C)
EB13 EGR valve 1, engine EB13 - EB9 1 - 10 Ω
EB23 Coolant level sensor, EB23 - EB10 > 100 kΩ (open)
signal normal level
< 5.0 Ω (closed) low
level
EB27 Coolant temperature EB27 -EB18 1.9 kΩ (20C)
sensor, signal 160 Ω (185C)
EB49 Fan control EB49 - EB57 < 50 Ω

Conditions:

Adapter 9990014 and breakout box 9998699 connected between the control unit and the cable harness.
Control unit connected
Ignition key in stop position
Measuring mode resistance with multimeter 9812519

Connector Signal type Measurement Expected value Measured Note


points value
EB51 SAE J1939 EB51 - EB55 60 Ω If a 120 Ω
termination
resistor is
missing (or if
connector EA
unplugged)

Stage 3: Function check (engine control unit)


Conditions:

Control unit connected


Measure on the diagnostic connector

DC no. = Connection in diagnostics socket

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Connector Signal type Measurement Expected value Measured Note


points value
DC3 SAE J1587/1708 DC3 - DC2 0-5V

Conditions:

Adapter 9990014 and breakout box9998699 connected to cable harness EA


Control unit connector EA unplugged
Ignition key in stop position
Measuring mode resistance with multimeter 9812519

DC no. = Connection in diagnostics socket

Connector Signal type Measurement Expected value Measured Note


points value
EA33 SAE J1587–/1708 (CAN EA33 - DC3 0Ω
high)

EA34 SAE J1587–/1708 (CAN EA34 - DC2 0Ω


low)

Conditions:

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Adapter 9990014 and breakout box9998699 connected to cable harness EB


Control unit connector EB unplugged
Ignition key in stop position
Measuring mode resistance with multimeter 9812519

DC no. = Connection in diagnostics socket

Connector Signal type Measurement Expected Measured Note


points value value
EB51 SAE J1939 (CAN EB51 - EB55 120 Ω
high)/1939 (CAN low)

Remarks:

Document filled in by: _______________

Dealer: _______________

Date: _______________

http://127.0.0.1:9905/impact3/application/staticdb/lang/enGB/sb41152_motor.xhtm 09-11-2018

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