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P0620-GENERATOR FIELD CONTROL MALF BATTERY VOLTAGE DEVI -
ATION TOO HIGH —
TEST
2
Turn the ignition on.
With the DRB, erase ECM DTCs.
Start the engine several times. Allow the engine to run for at least 30 seconds each
run cycle while turning the ignition off for at least 10 seconds between each run cycle.
Monitor the DRB for ECM DTCs.
Did this DTC set again?
Yes → Go To 3
→ Go To 10
No
3
Turn the ignition off.
Disconnect the Generator Field harness connector.
Measure the resistance of the Field Control terminals on the back of the Generator.
Is the resistance between 2 and 6 ohms?
Yes → Go To 4
→ Repair or replace the Generator as necessary.
No
4
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Generator Field harness connector.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
Turn the ignition on.
Measure the voltage of the Generator Field Control circuit.
Is the voltage below 1.0 volt?
Yes → Go To 5
→ Repair the Generator Field Control circuit for a short to voltage.
No
5
Turn the ignition off.
Disconnect ECM harness connectors.
Disconnect the Generator Field harness connector.
Measure the resistance between ground and the Generator Field Control circuit.
Is the resistance above 100 kohms?
Yes → Go To 6
→ Repair the Generator Field Control circuit for a short to ground.
No
6
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Generator Field harness connector.
Measure the resistance of the Generator Field Control circuit.
Is the resistance below 5.0 ohms?
Yes → Go To 7
→ Repair the Generator Field Control circuit for an open.
No
Continued
ACTION
Perform CHARGING VERIFICATION - VER-3.
Perform CHARGING VERIFICATION - VER-3.
Perform CHARGING VERIFICATION - VER-3.
Perform CHARGING VERIFICATION - VER-3.
DRIVEABILITY - DIESEL
133
APPLICABILITY
All
All
All
All
All
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