GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1997 🢒 Venture 🢒 Engine 🢒 Engine Electrical 🢒 Battery Is Undercharged or Overcharged

Battery Is Undercharged or Overcharged U Van and W Car

Step

Action

Value(s)

Yes

No

DEFINITION: Battery Is Undercharged Or Overcharged.

1
  1. Disconnect the generator connector.
  2. Turn the ignition switch to RUN.
  3. Attach a scan tool to the DLC.
  4. Clear any DTC.
  5. Select Misc. Tests, ENG Outputs, and GEN L Terminal.
  6. Command the generator ON.
  7. Use a digital multimeter to measure the voltage from the generator connection circuit 225 to ground.

Is the measured voltage within the specified value?

B+

Go to Step 3

Go to Step 2

2
  1. Check for a poor connection or an open in circuit 225.
  2. Service the PCM if circuit 225 is OK. Refer to Engine Controls.
  3. Recheck the system.

Is the system rechecked and is the service and/or repair complete?

--

System OK

--

3

Use a digital multimeter to measure the voltage from the generator BAT terminal to ground.

Is the measured voltage within the specified value?

B+

Go to Step 5

Go to Step 4

4
  1. Repair the open in circuit 2 to the generator BAT terminal.
  2. Recheck the system.

Is the system rechecked and is the repair complete?

--

System OK

--

5
  1. Reconnect the generator connector.
  2. Turn all the accessories off.
  3. Run the engine at a fast idle.
  4. Use a digital voltmeter to measure the voltage across the battery.

Is the measured voltage within the specified value?

13 - 16 V

Go to Step 7

Go to Step 6

6
  1. Replace the generator. Refer to Generator Replacement.
  2. Recheck the system.

Is the system rechecked and is the replacement complete?

--

System OK

--

7
  1. Load test the generator. Refer to Generator Electrical Test.
  2. Replace the battery if the generator tests OK. Refer to Battery Replacement.
  3. Recheck the system.

Is the system rechecked and is the replacement complete?

--

System OK

--

Battery Is Undercharged or Overcharged U Van Electrical

Step

Action

Value(s)

Yes

No

DEFINITION: Battery Is Undercharged Or Overcharged

Important: To avoid misdiagnosis be sure to zero the DMM before taking measurements.

1
  1. Disconnect the generator connector.
  2. Set the ignition switch to RUN.
  3. Attach a scan tool to the DLC.
  4. Clear any DTC.
  5. Select misc tests, eng outputs, and gen L term.
  6. Command the gen ON.
  7. Using a DMM, measure the voltage from the generator connector terminal L to ground.

Does the voltage equal B+?

9-14V

Go to Step 2

Go to Step 7

2

Use a DMM to measure the voltage from the generator BAT terminal to ground.

Is the measured voltage within the specified value?

9-14V

Go to Step 3

Go to Step 10

3
  1. Reconnect the generator connector.
  2. Turn OFF all the accessories.
  3. Run the engine at a fast idle.
  4. Using a DMM, measure the voltage across the battery.

Is voltage within the specified range?

13 - 16 V

Go to Step 4

Go to Step 11

4

Load test the generator. Refer to Charging Systems 6D3.

Did the generator test OK?

--

Go to Step 5

Go to Step 6

5

Replace the battery.

Has the repair been made and the system rechecked?

--

System OK

--

6

Replace the generator.

Has the repair been made and the system rechecked?

--

System OK

--

7

Check for a poor connection or open in circuit 225.

Is there a poor connection or open in circuit 225?

--

Go to Step 8

Go to Step 9

8

Repair the poor connection or open in circuit 225.

Has the repair been made and the system rechecked?

--

System OK

--

9

Service the PCM. Refer to Engine Controls.

Has the repair been made and the system rechecked?

--

System OK

--

10

Repair open in circuit 2 or the fusible link to the generator BAT terminal.

Has the repair been made and the system rechecked?

--

System OK

--

11

Replace the generator.

Has the repair been made and the system rechecked?

--

System OK

--