Jeep XJ. Manual — part 589
rough,
unstable,
or
erratic
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.
SKIM
sentry key immobilizer module
SKIS
sentry key immobilizer system
start &
stall
The engine starts but immediately
dies.
surge
engine rpm fluctuation without cor-
responding change in throttle posi-
tion sensor
VSS
vehicle speed sensor
8
GENERAL INFORMATION
7.0
DIAGNOSTIC INFORMATION AND
PROCEDURES
9
Symptom:
P0622-GENERATOR FIELD NOT SWITCHING PROPERLY - DIESEL
When Monitored and Set Condition:
P0622-GENERATOR FIELD NOT SWITCHING PROPERLY - DIESEL
When Monitored:
With the engine speed greater than 1500 RPM for at least 25 seconds.
Set Condition:
When the PCM tries to regulate the generator output with no result
during monitoring.
POSSIBLE CAUSES
INTERMITTENT CONDITION
CHECK FOR OTHER CHARGING SYSTEM DTCS
GENERATOR FIELD CIRCUIT OPEN
GENERATOR SOURCE CIRCUIT OPEN
POWERTRAIN CONTROL MODULE (INTERNAL DRIVER FAULT)
GENERATOR (FIELD OPEN)
POWERTRAIN CONTROL MODULE (GENERATOR SOURCE OPEN)
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, read PCM DTCs.
Are there any other Charging System related DTCs?
All
Yes
→
Refer to the symptom list for the related symptom(s).
Perform CHARGING VERIFICATION - VER-3.
No
→
2
NOTE: The battery must be fully charged and the generator belt must be in
good condition and tensioned properly before continuing.
Turn the ignition on.
With the DRB, erase PCM DTCs.
Turn the ignition off for 10 seconds, then start the engine.
With the DRB, read PCM DTCs.
Did this DTC reset?
All
Yes
→
No
→
3
Turn the ignition off, then on.
Measure the voltage of the Generator Field Driver circuit in PCM harness connector
C2 by back probing.
Is the voltage above 10.0 volts?
All
Yes
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform CHARGING VERIFICATION - VER-3.
No
→
10
CHARGING
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the Generator Field harness connector.
Turn the ignition on.
Measure the voltage of the Generator Source circuit.
Is the voltage above 10.0 volts?
All
Yes
→
No
→
5
Turn the ignition off.
Disconnect the Generator Field harness connector.
Disconnect the PCM harness connectors.
Measure the resistance of the Generator Field circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Replace the Generator.
Perform CHARGING VERIFICATION - VER-3.
No
→
Repair the Generator Field circuit for an open.
Perform CHARGING VERIFICATION - VER-3.
6
Turn the ignition off.
Disconnect the Generator Field harness connector.
Disconnect the PCM harness connectors.
Measure the resistance of the Generator Source circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform CHARGING VERIFICATION - VER-3.
No
→
Repair the Generator Source circuit for an open.
Perform CHARGING VERIFICATION - VER-3.
7
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform CHARGING VERIFICATION - VER-3.
No
→
Test Complete.
11
CHARGING
P0622-GENERATOR FIELD NOT SWITCHING PROPERLY - DIESEL —
Continued
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