Generator Not Operating Properly. Pontiac Firebird 1999

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 1999 🢒 Firebird 🢒 Body and Accessories 🢒 Data Link Communications 🢒 Generator Not Operating Properly

Test Description

If the test has shown the generator to be OK, however the condition remains, test the PCM or its control circuit(s) to the generator.

Step

Action

Value(s)

Yes

Did you perform the Charging System Check?

Go to Step 2

Go to Charging System Check

Important: The green POWER lamp of the tester should remain illuminated while the tester is being used.

Turn OFF the ignition.

Connect the red lead of the J 41450-B Generator Electronic Tester to the generator output terminal.

Connect the black lead of the J 41450-B Generator Electronic Tester to the metal generator housing.

Does the green POWER lamp on the tester illuminate?

Go to Step 5

Go to Step 3

Measure the voltage from the output terminal of the generator to the generator metal housing.

Does the voltage measure equal to the specified value?

B +

Go to Step 13

Go to Step 4

Measure the voltage from the output terminal of the generator to the battery negative terminal.

Does the voltage measure equal to the specified value?

B +

Go to Step 11

Go to Step 10

Caution: Batteries produce explosive gases. Batteries contain corrosive acid. Batteries supply levels of electrical current high enough to cause burns. Therefore, in order to reduce the risk of personal injury while working near a battery, observe the following guidelines:

•	Always shield your eyes.

•	Avoid leaning over the battery whenever possible.

•	Do not expose the battery to open flames or sparks.

•	Do not allow battery acid to contact the eyes or the skin.

-	Flush any contacted areas with water immediately and thoroughly.

-	Get medical help.

Turn OFF completely the load tool before connecting or disconnecting a carbon pile load tester to the battery. Otherwise, sparking at the terminals could cause battery gasses to explode and cause personal injury.

Connect a carbon pile tester to the vehicle

Important: Ensure that all generator output circuit wires pass through the inductive probe.

Connect an inductive ammeter to the output circuit of the generator.
Disconnect the generator harness connector.
Locate the matching harness connector on the J 41450-B , and connect the connector to the generator.

Does the red DIAGNOSTIC lamp on the tester illuminate?

Go to Step 6

Go to Step 12

Start the engine and allow it to idle for 30 seconds.
Increase the engine speed to 2500 RPM.

Does the red DIAGNOSTIC lamp on the tester illuminate?

Go to Step 14

Go to Step 7

Maintain the engine speed at 2500 RPM.

Important: If the generator is not capable of producing the Load Test amps, operate the generator at it's maximum possible output.

Turn ON the load of the carbon pile tester and increase the load until the generator output is equal to the Load Test value given in Generator Usage.

Does the red DIAGNOSTIC lamp on the tester illuminate?

Go to Step 14

Go to Step 8

Maintain the engine speed at 2500 RPM and continue to operate the generator at the load test value.
Measure the voltage drop from the output terminal of the generator to the positive terminal on the battery.

Does the voltage measure greater than the specified value?

0.5 V

Go to Step 10

Go to Step 9

Maintain the engine speed at 2500 RPM and continue to operate the generator at the load test value.
Measure the voltage drop from the battery negative terminal to the metal housing of the generator.

Does the voltage measure greater than the specified value?

0.5 V

Go to Step 11

Go to Step 15

Repair the high resistance or an open in the output circuit of the generator.

Did you complete the repair?

Go to Step 15

Repair the high resistance or open in the ground circuit of the generator.

Did you complete the repair?

Go to Step 15

Disconnect the J 41450-B tester harness connector from the generator, but leave the alligator clips connected so that the green POWER lamp remains illuminated.
Connect a jumper lead, with an in-line 100-ohm resistor between the J 41450-B tester harness connector terminal B and a good ground.

Does the red DIAGNOSTIC lamp illuminate?

Go to Step 14

Go to Step 13

There is a problem with the J 41450-B . Refer to the manufacturers instructions, how to test the J 41450-B for proper operation.

Has the J 41450-B tester been replaced?

Go to Step 2

Replace the generator. Refer to Generator Replacement .

Did you complete the replacement?

Go to Step 15

Operate the vehicle in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2