Symptom:
P0622-GENERATOR FIELD CONTROL CIRCUIT
When Monitored and Set Condition:
P0622-GENERATOR FIELD CONTROL CIRCUIT
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.
POSSIBLE CAUSES
GOOD TRIP EQUAL TO ZERO
GENERATOR OPERATION
(Z1) GEN FIELD GROUND CIRCUIT OPEN
(K20) GEN FIELD CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE
(K20) GEN FIELD CONTROL CIRCUIT SHORTED TO GROUND
(K20) GEN FIELD CONTROL CIRCUIT OPEN
PCM
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIIIt, read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
All
Yes → Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER-3-NGC.
No → Go To 2
2 Turn the ignition off.
Disconnect the Generator Field harness connector.
Using a 12-volt test light, jumper it across the Generator Field harness connector.
Ignition on, engine not running.
With the DRBIIIt, actuate the Generator Field Driver circuit.
Does the test light illuminate brightly and flash on and off?
All
Yes → Replace the Generator.
Perform POWERTRAIN VERIFICATION TEST VER-3-NGC.
No → Go To 3
226
DRIVEABILITY - NGC
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