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GPEC







*CHECKING THE CHARGING SYSTEM OPERATION





For a complete wiring diagram Consult Diagrams/Electrical.

Diagnostic Test

1. GENERATOR FULL FIELD TEST

NOTE: Diagnose and repair any generator sense or field control circuit DTCs before proceeding with this test.

Start the engine and allow it to reach operating temperature.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

With the scan tool, perform the Generator Full Field test. Follow the instructions displayed on the scan tool.
Monitor the system (battery) voltage and the generator sense voltage on the scan tool while performing the test.

NOTE: With the engine running, the difference between the system (battery) voltage and the generator sense voltage should be below.2 volts.

NOTE: With the generator field fully actuated, the system (battery) voltage should be above 14.0 volts.

NOTE: With the generator field actuated off, the system (battery) voltage should be below 13.0 volts, and eventually drop as battery load is increased.

Did the system voltage change as described above during the Generator Full Field test?

Yes

- Test complete.

No

- Go to 2

2. CHARGING SYSTEM INSPECTION
Inspect and test the battery.
Inspect the generator drive belt for proper alignment and adjustment.
Inspect the vehicle for aftermarket accessories that may exceed the generator system output.
Inspect the fuses in the IPM. If an open fuse is found, use the wire diagram/schematics as a guide and inspect the wiring and connectors for a damaged or shorted circuit.
Were any problems found?

Yes

- Repair as necessary.

No

- Go to 3

3. BATTERY POSITIVE (+) CIRCUIT HIGH RESISTANCE

NOTE: Make sure all testing equipment and cables are clear of any engine parts before starting the engine.

Start the engine.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

Measure the voltage between the B (+) Terminal at the Generator and the Battery Positive (+) Post.
Is the voltage below 0.4 volts?

Yes

- Go to 4

No

- Repair the battery positive (+) circuit between the generator and battery for high resistance.
- Perform the PCM Verification Test.Powertrain Verification Test

4. GENERATOR CASE GROUND HIGH RESISTANCE

NOTE: Make sure all testing equipment and cables are clear of any engine parts before starting the engine.

Start the engine.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

Measure the voltage between the Generator case and the Battery Negative (-) post.
Is the voltage below 0.1 volt?

Yes

- Go to 5

No

- Repair the Generator Case ground for high resistance.
- Perform the PCM Verification Test.Powertrain Verification Test

5. (A109) FUSED B(+) CIRCUIT HIGH RESISTANCE
Turn the ignition off.

NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.

Using a voltmeter, perform a voltage drop test by probing the battery positive (+) terminal and the appropriate terminal(s) of the PCM. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

Start the engine.
Is the voltage below 0.5 volts?

Yes

- Go to 6

No

- Repair the (A109) Fused B(+) circuit(s) for high resistance.
- Perform the PCM Verification Test.Powertrain Verification Test

6. (A804) GENERATOR SENSE CIRCUIT HIGH RESISTANCE
Turn the ignition off.

NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.

Using a voltmeter, perform a voltage drop test by backprobing the (A804) Generator Sense circuit at the Generator harness connector and the PCM harness connector. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

Start the engine.
Is the voltage below 0.5 volts?

Yes

- Go to 7

No

- Repair the (A804) Generator Sense circuit for high resistance.
- Perform the PCM Verification Test.Powertrain Verification Test

7. (K20) GEN FIELD CONTROL CIRCUIT HIGH RESISTANCE
Turn the ignition off.

NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.

Using a voltmeter, perform a voltage drop test by backprobing the (K20) Gen Field Control circuit at the Generator harness connector and at the PCM harness connector. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

Start the engine.
Is the voltage below 0.5 volts?

Yes

- Go to 8

No

- Repair the (K20) Gen Field Control circuit for high resistance.
- Perform the PCM Verification Test.Powertrain Verification Test

8. GENERATOR
Turn the ignition off.
Disconnect the Generator harness connector.
Connect a 12 volt test light connected between ground and the (K20) Gen Field Control circuit in the Generator harness connector.
Turn the ignition on.
With the scan tool, actuate the Alternator Field Control State to toggle.

NOTE: The test light should toggle on and off with the actuation.

NOTE: If a DTC is active, the actuation test may not be allowed by the PCM. If may be necessary to clear DTCs before starting the actuation.

Does the test light illuminate on and off with the actuation?

Yes

- Replace the Generator.
- Perform the PCM Verification Test.Powertrain Verification Test

No

- Go to 9

9. (K20) GEN FIELD CONTROL CIRCUIT SHORTED TO VOLTAGE




Turn the ignition off.
Disconnect the Powertrain Control Module (PCM) connector.
Turn the ignition on.
Measure the voltage of the (K20) Gen Field Control circuit in the Generator harness connector.
Is there any voltage present?

Yes

- Repair the (K20) Gen Field Control circuit for a short to voltage.
- Perform the PCM Verification Test.Powertrain Verification Test

No

- Go to 10

10. (K20) GEN FIELD CONTROL CIRCUIT SHORTED TO GROUND




Turn the ignition off.
Measure the resistance between ground and the (K20) Gen Field Control circuit in the Generator harness connector.
Is the resistance below 100 ohms?

Yes

- Repair the (K20) Gen Field Control circuit for a short to ground.
- Perform the PCM Verification Test.Powertrain Verification Test

No

- Go to 11

11. (K20) GEN FIELD CONTROL CIRCUIT OPEN OR HIGH RESISTANCE




NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.

Measure the resistance of the (K20) Gen Field Control circuit between the Generator harness connector and the PCM harness connector.
Is the resistance below 5.0 ohms?

Yes

- Go to 12

No

- Repair the (K20) Gen Field Control circuit for an open circuit or high resistance.
- Perform the PCM Verification Test.Powertrain Verification Test

12. CHECKING THE PCM POWER AND GROUND CIRCUITS
Perform the diagnostic procedure for CHECKING THE PCM POWER AND GROUND CIRCUITS. Checking the PCM Power and Ground Circuits
Were any problems found?

Yes

- Repair the PCM power and ground circuit(s) as necessary.
- Perform the PCM Verification Test.Powertrain Verification Test

No

- Go to 13

13. POWERTRAIN CONTROL MODULE (PCM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Generator and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Search for any Technical Service Bulletins that may apply.
Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification Test.Powertrain Verification Test

No

- Replace and program the Powertrain Control Module (PCM).
- Perform the PCM Verification Test.Powertrain Verification Test

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