Jeep XJ. Manual — part 613
Symptom List:
P1220-FUEL QUANTITY ACTUATOR POS GOV DEVIATION COLD
P1220-FUEL QUANTITY ACTUATOR POS GOV DEVIATION WARM
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P1220-FUEL QUANTITY ACTU-
ATOR POS GOV DEVIATION COLD.
When Monitored and Set Condition:
P1220-FUEL QUANTITY ACTUATOR POS GOV DEVIATION COLD
When Monitored:
With the engine running.
Set Condition:
The ECM has attempted to compensate for a lean condition and the engine
coolant temperature is below 60° C (140° F).
P1220-FUEL QUANTITY ACTUATOR POS GOV DEVIATION WARM
When Monitored:
With the engine running.
Set Condition:
The ECM has attempted to compensate for a lean condition and the engine
coolant temperature is above 60° C (140° F).
POSSIBLE CAUSES
INTERMITTENT CONDITION
CHECK THE FUEL INJECTION PUMP TIMING
CHECK FOR A FUEL RESTRICTION
REPLACE THE FUEL INJECTION PUMP
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, erase ECM DTCs.
Start the engine and vary the engine speed from idle to 3500 RPM several times.
With the DRB, read ECM DTCs.
Did this DTC reset?
All
Yes
→
No
→
2
Check the Fuel Injection Pump timing using the Service Information.
Is the Fuel Injection Pump timing correct?
All
Yes
→
No
→
Set the Fuel Injection Pump timing in accordance with the
Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
104
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Inspect the fuel system for restrictions in the delivery lines, filter and/or at the fuel
level sensor module.
Was a restriction found?
All
Yes
→
Repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
4
Turn the ignition off.
Replace the Fuel Injection Pump in accordance with the Service Information.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Start the engine and vary the engine speed from idle to 3500 RPM several times.
With the DRB, read ECM DTCs.
Did this DTC reset?
All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
The repair is complete.
Perform ROAD TEST VERIFICATION - VER-2.
5
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 ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
105
DRIVEABILITY - DIESEL
P1220-FUEL QUANTITY ACTUATOR POS GOV DEVIATION COLD —
Continued
Symptom List:
P1225-CONTROL SLEEVE SENSOR SIGNAL HIGH EXCEEDED
P1225-CONTROL SLEEVE SENSOR SIGNAL LOW EXCEEDED
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P1225-CONTROL SLEEVE SEN-
SOR SIGNAL HIGH EXCEEDED.
When Monitored and Set Condition:
P1225-CONTROL SLEEVE SENSOR SIGNAL HIGH EXCEEDED
When Monitored:
With the ignition on and during after-run mode (at key-off).
Set Condition:
The ECM does not receive a correct signal from the measure coil and/or
the sensor coil. NOTE: This fault will cause the engine to stumble and/or stall.
P1225-CONTROL SLEEVE SENSOR SIGNAL LOW EXCEEDED
When Monitored:
With the ignition on and during after-run mode (at key-off).
Set Condition:
The ECM does not receive a correct signal from the measure coil and/or
the sensor coil.
POSSIBLE CAUSES
INTERMITTENT CONDITION
FUEL INJECTION PUMP - CONTROL SLEEVE POSITION SENSOR OPEN
FUEL INJECTION PUMP - CONTROL SLEEVE POSITION SENSOR SHORTED TO GROUND
CONTROL SLEEVE POSITION SENSOR CIRCUITS SHORTED TO VOLTAGE
CONTROL SLEEVE POSITION SENSOR CIRCUIT SHORTED TO GROUND
CONTROL SLEEVE POSITION SENSOR CIRCUITS SHORTED TOGETHER
CONTROL SLEEVE POSITION SENSOR CIRCUITS OPEN
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, erase ECM DTCs.
Turn the ignition off and wait for at least 30 seconds.
Turn the ignition on.
Monitor the DRB for ECM DTCs.
Did this DTC reset?
All
Yes
→
No
→
106
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
2
Turn the ignition off.
Disconnect the Fuel Injection Pump harness connector.
Measure the resistance between Fuel Injection Pump connector (fuel pump side)
cavities 1 and 2, then 2 and 3.
Is the resistance between 5.0 and 7.0 ohms for each measurement?
All
Yes
→
No
→
Replace the Fuel Injection Pump in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
3
Turn the ignition off.
Disconnect the Fuel Injection Pump harness connector.
Measure the resistance between ground and Fuel Injection Pump connector (fuel
pump side) cavities 1, 2 then 3.
Is the resistance above 100 kohms for each measurement?
All
Yes
→
No
→
Replace the Fuel Injection Pump in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Disconnect the Fuel Injection Pump harness connector.
Disconnect the ECM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD/Diesel Power
Relay connector.
Turn the ignition on.
Measure the voltage on ECM harness connector C2 cavity 56.
Measure the voltage on ECM harness connector C2 cavity 57.
Measure the voltage on ECM harness connector C2 cavity 58.
Is the voltage above 0.5 volt for any of the measurements?
All
Yes
→
Repair the Control Sleeve Position Sensor circuit(s) that mea-
sured above 0.5 volt for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
NOTE: Remove the jumper wire.
5
Turn the ignition off.
Disconnect the Fuel Injection Pump harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and ECM harness connector C2 cavities 56,
57, and 58.
Is the resistance above 100 kohms for each of the measurements?
All
Yes
→
No
→
Repair the Control Sleeve Position Sensor circuit(s) that mea-
sured below 100 kohms for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
107
DRIVEABILITY - DIESEL
P1225-CONTROL SLEEVE SENSOR SIGNAL HIGH EXCEEDED —
Continued
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