Hummer H3. Manual — part 10

3. Attach the end of one jumper cable to the positive terminal of the discharged battery.

4. Attach the other end of the first cable to the positive terminal of the booster battery.

5. Attach one end of the remaining jumper cable to the negative terminal of the booster

battery.

6. Make the final connection of the negative jumper cable to the block or suitable bracket

connected directly to the block, away from the battery.

7. Start the engine of the vehicle that is providing the jump start and turn off all electrical

accessories. Raise the engine RPM to approximately 1,500 RPM.

8. Crank the engine of the vehicle with the weak battery.

If the engine does not crank or cranks too slowly, perform the following steps:

1. Turn the ignition OFF.

2. Allow the booster vehicle engine to run at approximately 1,500 RPM for 5 minutes.

3. Attempt to start the engine of the vehicle with the discharged battery.

9. Reverse the steps exactly when removing the jumper cables. The negative battery cable must

first be disconnected from the engine that was jump started.

CHARGING SYSTEM TEST

Charging System Test

for proper connections.

NOTE:

Do not connect the negative charger lead to the housings of
other vehicle electrical accessories or equipment. The action
of the battery charger may damage such equipment.

Step

Action

Values

Yes

No

1

Did you perform the Diagnostic System
Check - Vehicle?

-

Go to Step 2

Go to

Diagnostic

System Check

- Vehicle in

Vehicle DTC

Information

2

IMPORTANT:

The battery must be above a 70 percent state
of charge.

-

2006 Hummer H3

2006 ENGINE Engine Electrical - H3

Did you perform the Battery Inspection
Test?

Go to Step 3

Go to Battery

Inspection/Test

(Non-HP2)

3

1. Install a scan tool.

2. Start the engine.

3. With a scan tool, command the

GEN-L Terminal OFF and ON.

4. Observe the Ignition 1 Signal

parameter.

Does the voltage change with each
command?

-

Go to Step 4 Go to Step 8

4

1. Turn ON the following accessories:

Headlights-High beams

A/C on Max

Blower fan-ON high

Heated seats, if equipped

2. With a scan tool, observe the

Ignition 1 Signal parameter in the
engine data list.

3. Increase engine speed to 2,500

RPM.

Is the voltage within the specified value?

12-15.5 V

Go to Step 5 Go to Step 6

1. Turn OFF all accessories.

2. Turn OFF the ignition.

3. Connect a carbon pile tester to the

vehicle.

CAUTION:

Make sure that the load is completely
turned off before connecting or
disconnecting a carbon pile load
tester to the battery. Otherwise,
sparking could ignite battery gasses
which are extremely flammable and
may explode violently.

2006 Hummer H3

2006 ENGINE Engine Electrical - H3

5

4. Connect an inductive ammeter

probe to the output circuit of the
generator.

5. Start the engine.

6. With a scan tool, command the

GEN-L Terminal ON.

7. Increase engine speed to 2,500

RPM.

8. Adjust the carbon pile as necessary

in order to obtain the maximum
current output.

Is the generator output greater than or
equal to the load test value as specified in
Generator Usage ?

IMPORTANT:

When measuring generator output
current, be sure the inductive probe
encircles the generator output wire.

-

System OK

Go to Step 7

6

Is the voltage measured greater than 15.5
volts?

-

Go to Step

12

Go to Step 7

7

1. Leave the vehicle accessories ON or

maintain load test value.

2. Maintain engine speed at 2,500

RPM.

3. Measure the voltage between the

generator output terminal and the
generator metal housing.

Is the voltage measured equal to the
specified value?

B+

Go to Step

14

Go to Step 9

1. Turn ON the ignition, with the

engine OFF.

2. Disconnect the generator harness

connector.

3. Measure the voltage between the

2006 Hummer H3

2006 ENGINE Engine Electrical - H3

8

generator turn ON signal circuit and
ground.

4. With a scan tool, command the

GEN-L Terminal ON and OFF.

Does the voltage measure greater than the
first value ON and near the second value
OFF?

4.7 V

0 V

Go to Step

14

Go to Step 11

9

1. Maintain the engine speed at 2,500

RPM and continue to operate the
generator at the load test value.

2. Measure the voltage drop from the

battery negative terminal to the
metal housing of the generator.
Refer to Circuit Testing
andWiring Repairs in Wiring
Systems.

Is the voltage measured less than the
specified value?

0.5 V

Go to Step

10

Go to Step 15

10

1. Maintain the engine speed at 2,500

RPM and continue to operate the
generator at the load test value.

2. Measure the voltage drop from the

output terminal of the generator to
the positive terminal on the battery.
Refer to Circuit Testing and
Wiring Repairs in Wiring
Systems.

Is the voltage measured less than the
specified value?

0.5 V

Go to Step

14

Go to Step 16

11

Test the generator turn on signal circuit
for a short or open. Refer to Circuit
Testing and Wiring Repairs in Wiring
Systems.
Did you find and correct the condition?

-

Go to Step

19

Go to Step 13

Test the generator battery voltage sense

2006 Hummer H3

2006 ENGINE Engine Electrical - H3