Dodge Dakota (R1). Manual — part 821
rough,
unstable,
or er-
ratic idle
stalling
The engine runs unevenly at idle
and causes the engine to shake if it
is severe enough. The engine idle
rpm may vary (called “hunting”).
This condition may cause stalling if
it is severe enough.
SBEC
Single Board Engine Controller
start &
stall
The engine starts but immediately
dies.
surge
engine rpm fluctuation without cor-
responding change in throttle posi-
tion sensor
TCC
torque convertor clutch
TPS
throttle position sensor
TRS
transmission range sensor
VSS
vehicle speed sensor/signal
16
GENERAL INFORMATION
7.0
DIAGNOSTIC INFORMATION AND
PROCEDURES
17
Symptom:
P0622-GENERATOR FIELD NOT SWITCHING PROPERLY
When Monitored and Set Condition:
P0622-GENERATOR FIELD NOT SWITCHING PROPERLY
When Monitored:
With the ignition key on and the engine running.
Set Condition:
When the PCM tries to regulate the generator field with no result during
monitoring.
POSSIBLE CAUSES
GENERATOR FIELD WIRING HARNESS INTERMITTENT PROBLEM
GENERATOR FIELD WIRING HARNESS OBSERVABLE PROBLEM
GENERATOR FIELD DRIVER CIRCUIT OPEN
GENERATOR FIELD DRIVER CIRCUIT SHORTED TO GROUND
GENERATOR FIELD RESISTANCE >= 5.0 OHMS
GENERATOR FIELD SOURCE (+) CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
With the DRBIII
t, actuate the Generator Field Driver Circuit.
Using a 12-volt test light, backprobe the Generator Field Driver Circuit at the back
of the Generator.
Did the light blink?
All
Yes
→
No
→
2
Ignition on, engine not running.
With the DRBIII
t actuate the Generator Field Driver Circuit.
Wiggle Wiring Harness from the Generator to PCM.
With the DRBIII
t, read DTC’s.
Does the Generator Field Driver (-) Circuit code return?
All
Yes
→
Repair as necessary where wiggling caused problem to appear.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
Test Complete.
18
CHARGING
TEST
ACTION
APPLICABILITY
3
Ignition on, engine not running.
Record all DTC’s and freeze frame data, now erase Codes.
Carefully inspect all Connectors for corrosion or spread Terminals before continuing.
With the DRBIII
t actuate the Generator Field Driver Circuit.
Backprobe the Generator Field Source (+) Circuit at back of Generator.
Is the voltage above 10.0 volts?
All
Yes
→
No
→
Repair the open Generator Field Source (+) Circuit to Generator.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
4
Turn the ignition off.
Disconnect the PCM harness connector(s).
Disconnect the Generator Field harness connector.
Measure the Generator Field Driver Circuit from PCM Connector to ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the Generator Field Driver Circuit shorted to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
5
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Generator Field harness connector.
Note: Check Connectors - Clean/repair as necessary.
Measure the Generator Field Driver Circuit from PCM to Generator.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open Generator Field Driver Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
6
Turn the ignition off.
Disconnect the Generator Field harness connector at back of the Generator.
Note: Check connectors - Clean/repair as necessary.
Measure resistance across the Generator Field Terminals at the Generator.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the Generator as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
7
If there are no possible causes remaining,
View repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
19
CHARGING
P0622-GENERATOR FIELD NOT SWITCHING PROPERLY —
Continued
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