Opel Frontera UBS. Manual - part 2122

 

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Opel Frontera UBS. Manual - part 2122

 

 

6E–61

ENGINE DRIVEABILITY AND EMISSIONS

D

An erratic voltage reading (large fluctuations in
voltage that do not stabilize) indicates an
intermittent connection within the fuel injector.

5. Injector Specifications:

Highest Acceptable

Voltage Reading

Above/Below 35

°

C/10

°

C

(95

°

F/50

°

F)

Acceptable Subtracted

Value

9.5 Volts

0.6 Volts

7. The Fuel Injector Balance Test portion of this chart

(Step 7 through Step 11) checks the mechanical
(fuel delivery) portion of the fuel injector.  An engine
cool-down period of 10 minutes is necessary in
order to avoid irregular fuel pressure readings due
to “Hot Soak” fuel boiling.

Injector Coil Test Procedure (Steps 1-6) and Injector Balance Test Procedure (Steps 7-11)

R262001

CYLINDER

1

2

3

4

5

6

1st Reading (1)

296 kPa

(43 psi)

296 kPa

(43 psi)

296 kPa

(43 psi)

296 kPa

(43 psi)

296 kPa

(43 psi)

296 kPa

(43 psi)

2nd Reading (2)

131 kPa

(19 psi)

117 kPa

(17 psi)

124 kPa

(18 psi)

145 kPa

(21 psi)

131 kPa

(19 psi)

130 kPa

(19 psi)

Amount of Drop (1st

Reading–2nd Reading)

165 kPa

(24 psi)

179 kPa

(26 psi)

172 kPa

(25 psi)

151 kPa

(22 psi)

165 kPa

(24 psi)

166 kPa

(24 psi)

Av.drop = 166 kPa/24 psi 

±

10 kPa/1.5 psi

= 156 – 176 kPa or

22.5 – 25.5 psi

OK

Faulty, Rich

(Too Much

Fuel Drop)

OK

Faulty, Lean

(Too Little

Fuel Drop)

OK

OK

NOTE: These figures are examples only.

6E–62

ENGINE DRIVEABILITY AND EMISSIONS

Injector Coil Test Procedure (Steps 1-6) and Injector Balance Test Procedure

(Steps 7-11)

 

Step

Action

Value(s)

Yes

No

1

Was the “On-Board Diagnostic (OBD)  System Check”
performed?

Go to Step 2

Go to 

OBD

System

Check

2

1. Turn the engine “OFF.”

NOTE: In order to prevent flooding of a single cylinder
and possible engine damage, relieve the fuel pressure
before performing the fuel injector coil test procedure.

2. Relieve the fuel pressure.  Refer to 

Test Description

Number 2.

3. Connect the 5-8840-2638-0 Fuel Injector Tester to

B+ and ground, and to the 5-8840-2619-0 Injector
Switch Box.

4. Connect the injector switch box to the grey fuel

injector harness connector located on the front of
the EVAP canister bracket.

5. Set the amperage supply selector switch on the fuel

injector tester to the “Coil Test” 0.5 amp position.

6. Connect the leads from the 5-8840-0285-0 Digital

Voltmeter (DVM) to the injector tester.  Refer to the
illustrations associated with the test description.

7. Set the DVM to the tenths scale (0.0).
8. Observe the engine coolant temperature.

Is the engine coolant temperature within the specified
values?

10

°

C (50

°

F)

to 35

°

C

(95

°

F)

Go to 

Step 3

Go to 

Step 5

3

1. Set injector switch box injector #1.
2. Press the “Push to Start Test” button on the fuel

injector tester.

3. Observe the voltage reading on the DVM.

IMPORTANT: The voltage reading may rise during the
test.

4. Record the lowest voltage observed after the first

second of the test.

5. Set the injector switch box to the next injector and

repeat steps 2, 3, and 4.

Did any fuel injector have an erratic voltage reading
(large fluctuations in voltage that did not stabilize) or a
voltage reading outside of the specified values?

5.7-6.6 V

Go to 

Step 4

Go to 

Step 7

4

Replace the faulty fuel injector(s). Refer to 

Fuel

Injector.

Is the action complete?

Go to 

Step 7

6E–63

ENGINE DRIVEABILITY AND EMISSIONS

Injector Coil Test Procedure (Steps 1-6) and Injector Balance Test Procedure

(Steps 7-11)

  (Cont'd)

Step

No

Yes

Value(s)

Action

5

1. Set injector switch box injector #1.
2. Press the “Push to Start Test” button on the fuel

injector tester.

3. Observe the voltage reading on the DVM.

IMPORTANT: The voltage reading may rise during the
test.

4. Record the lowest voltage observed after the first

second of the test.

5. Set the injector switch box to the next injector and

repeat steps 2, 3, and 4.

Did any fuel injector have an erratic voltage reading
(large fluctuations in voltage that did not stabilize) or a
voltage reading above the specified value?

9.5 V

Go to 

Step 4

Go to 

Step 6

6

1. Identify the highest voltage reading recorded (other

than those above 9.5 V).

2. Subtract the voltage reading of each injector from

the highest voltage selected in step 1.  Repeat until
you have a subtracted value for each injector.

For any injector, is the subtracted Value in step 2
greater than the specified value?

0.6 V

Go to 

Step 4

Go to 

Step 7

7

CAUTION: In order to reduce the risk of fire and
personal injury, wrap a shop towel around the
fuel pressure connection.  The towel will absorb
any fuel leakage that occurs during the
connection of the fuel pressure gauge.  Place the
towel in an approved container when the
connection of the fuel pressure gauge is
complete.

1. Connect the 5-8840-0378-0 Fuel Pressure Gauge

to the fuel pressure test port.

2. Energize the fuel pump using the scan tool.
3. Place the bleed hose of the fuel pressure gauge into

an approved gasoline container.

4. Bleed the air out of the fuel pressure gauge.
5. With the fuel pump running, observe the reading on

the fuel pressure gauge.

Is the fuel pressure within the specified values?

296-376 kPa

(43-55 psi)

Go to 

Step 8

Go to 

Fuel

System

Diagnosis

8

Turn the fuel pump “OFF.”

Does the fuel pressure remain constant?

Go to 

Step 9

Go to 

Fuel

System

Diagnosis

6E–64

ENGINE DRIVEABILITY AND EMISSIONS

Injector Coil Test Procedure (Steps 1-6) and Injector Balance Test Procedure

(Steps 7-11)

  (Cont'd)

Step

No

Yes

Value(s)

Action

9

1. Connect the 5-8840-2638-0 Fuel Injector Tester

and 5-8840-2619-0 Injector Switch Box the fuel
injector harness connector.

2. Set the amperage supply selector switch on the fuel

injector tester to the “Balance Test” 0.5–2.5 amp
position.

3. Using the scan tool turn the fuel pump “ON” then

“OFF” in order to pressurize the fuel system.

4. Record the fuel pressure indicated by the fuel

pressure gauge after the fuel pressure stabilizes.
This is the first pressure reading.

5. Energize the fuel injector by depressing the “Push

to Start Test” button on the fuel injector tester.

6. Record the fuel pressure indicated by the fuel

pressure gauge after the fuel pressure gauge
needle has stopped moving.  This is the second
pressure reading.

7. Repeat steps 1 through 6 for each fuel injector.
8. Subtract the second pressure reading from the first

pressure reading for one fuel injector.  The result is
the pressure drop value.

9. Obtain a pressure drop value for each fuel injector.
10.Add all of the individual pressure drop values.  This

is the total pressure drop.

11. Divide the total pressure drop by the number of fuel

injectors.  This is the average pressure drop.

Does any fuel injector have a pressure drop value that
is either higher than the average pressure drop or lower
than the average pressure drop by the specified value?

10 kPa

(1.5 psi)

Go to 

Step 10

Go to 

OBD

System

Check

10

Re-test any fuel injector that does not meet the
specification. Refer to the procedure in step 11.

NOTE: Do not repeat any portion of this test before
running the engine in order to prevent the engine from
flooding.

Does any fuel injector still have a pressure drop value
that is either higher than the average pressure drop or
lower than the average pressure drop by the specified
value?

10 kPa

(1.5 psi)

Go to 

Step 11

Go to

Symptoms

11

Replace the faulty fuel injector(s).  Refer to 

Fuel

Injector.

Is the action complete?

Verify repair

 

 

 

 

 

 

 

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