P0622

P0622-GENERATOR FIELD CONTROL CIRCUIT

For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
With the ignition on. Engine running.

- Set Condition:
When the PCM tries to regulate the generator field with no result during monitoring. One Trip Fault. Three good trips to turn off the MIL.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

Diagnostic Test

1. ACTIVE DTC
Ignition on, engine not running.
With a scan tool, select View DTCs.
Is the DTC Active at this time?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Checking for an Intermittent DTC.

2. GENERATOR OPERATION




Using a 12-volt test light connected to ground, probe the (K20) Generator Field Control circuit in the Generator Field harness connector.
Ignition on, engine not running.

NOTE: The DTC needs to be cleared before actuating the Generator Field, if the DTC is not cleared, the Generator Field may not be allowed to actuate.

With a scan tool, actuate the Generator Field Driver.
Does the test light illuminate brightly and flash on and off?

Yes

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

No

- Go To 3

3. (K20) GEN FIELD CIRCUIT SHORTED BATTERY VOLTAGE




Turn the ignition off.
Disconnect the C2 PCM harness connector.
Ignition on, engine not running.
Measure the voltage on the (K20) Gen Field Control circuit in the Generator Field harness connector.
Is the voltage above 1.0 volt?

Yes

- Repair the short to battery voltage in the (K20) Gen Field Control circuit.
- Perform the PCM Verification Test. PCM Verification Test.

No

- Go To 4

4. (K20) GEN FIELD CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (K20) Gen Field Control circuit from the Generator Field harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?

Yes

- Go To 5

No

- Repair the open in the (K20) Gen Field Control circuit.
- Perform the PCM Verification Test. PCM Verification Test.

5. (K20) GEN FIELD CIRCUIT SHORTED TO GROUND




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

Yes

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

No

- Go To 6

6. PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
Were there any problems found?

Yes

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

No

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