Jeep XJ. Manual — part 612
Symptom:
P1220-FUEL QUANTITY ACTUATOR NEG GOV DEVIATION COLD
When Monitored and Set Condition:
P1220-FUEL QUANTITY ACTUATOR NEG GOV DEVIATION COLD
When Monitored:
With the engine running.
Set Condition:
The ECM has attempted to compensate for a rich condition and the engine
coolant temperature is below 60° C (140° F). NOTE: An improperly timed fuel injection
pump may also set this code.
POSSIBLE CAUSES
INTERMITTENT CONDITION
FUEL INJECTION PUMP SHORTED INTERNALLY
FUEL QUANTITY ACTUATOR CONTROL CIRCUIT SHORTED TO GROUND
INTERNAL FUEL INJECTION PUMP TEST
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
NOTE: An improperly timed Fuel Injection Pump may also set this DTC.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Turn the ignition off, wait 10 seconds, then attempt to start and idle the engine.
With the DRB, read ECM DTCs.
Did this DTC reset?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the Fuel Injection Pump harness connector.
Measure the resistance between ground and Fuel Injection Pump connector (fuel
pump side) cavity 8.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Replace the Fuel Injection Pump in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
100
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Fuel Injection Pump harness connector.
Measure the resistance between ground and the Fuel Quantity Actuator Control
circuit in ECM harness connector C2, cavities 59, 66, and 80.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Fuel Quantity Actuator Control circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Disconnect the Fuel Injection Pump harness connector.
Measure the resistance between the following cavities in the Fuel Injection Pump
connector (fuel pump side):
Cavity 1 to cavities 4, 5, 6, 7, 8, 9, and 10.
Cavity 4 to cavities 5, 6, 7, 8, 9, and 10.
Cavity 5 to cavities 6, 7, 8, and 9.
Cavity 7 to cavities 6, 8, 9, and 10.
Cavity 8 to cavities 6 and 10.
NOTE: The resistance should be above 100 ohms for all measurements.
Is the resistance above 100 ohms for each of the measurements?
All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Replace the Fuel Injection Pump in accordance with the Service
Information.
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.
101
DRIVEABILITY - DIESEL
P1220-FUEL QUANTITY ACTUATOR NEG GOV DEVIATION COLD —
Continued
Symptom:
P1220-FUEL QUANTITY ACTUATOR NEG GOV DEVIATION WARM
When Monitored and Set Condition:
P1220-FUEL QUANTITY ACTUATOR NEG GOV DEVIATION WARM
When Monitored:
With the engine running.
Set Condition:
The ECM has attempted to compensate for a rich condition and the engine
coolant temperature is above 60° C (140° F).
POSSIBLE CAUSES
INTERMITTENT CONDITION
FUEL INJECTION PUMP SHORTED INTERNALLY
FUEL QUANTITY ACTUATOR CONTROL CIRCUIT SHORTED TO GROUND
INTERNAL FUEL INJECTION PUMP TEST
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
Turn the ignition off.
Disconnect the Fuel Injection Pump harness connector.
Measure the resistance between ground and Fuel Injection Pump connector (fuel
pump side) cavity 8.
Is the resistance above 100 kohms?
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 ECM harness connectors.
Disconnect the Fuel Injection Pump harness connector.
Measure the resistance between ground and the Fuel Quantity Actuator Control
circuit in ECM harness connector C2, cavities 59, 66, and 80.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Fuel Quantity Actuator Control circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
102
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the Fuel Injection Pump harness connector.
Measure the resistance between the following cavities in the Fuel Injection Pump
connector (fuel pump side):
Cavity 1 to cavities 4, 5, 6, 7, 8, 9, and 10.
Cavity 4 to cavities 5, 6, 7, 8, 9, and 10.
Cavity 5 to cavities 6, 7, 8, and 9.
Cavity 7 to cavities 6, 8, 9, and 10.
Cavity 8 to cavities 6 and 10.
NOTE: The resistance should be above 100 ohms for all measurements.
Is the resistance above 100 ohms for each of the measurements?
All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Replace the Fuel Injection Pump in accordance with the Service
Information.
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.
103
DRIVEABILITY - DIESEL
P1220-FUEL QUANTITY ACTUATOR NEG GOV DEVIATION WARM —
Continued
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