Jeep XJ. Manual — part 599
Symptom:
P0180-FUEL TEMPERATURE SENSOR SRC LOW EXCEEDED
When Monitored and Set Condition:
P0180-FUEL TEMPERATURE SENSOR SRC LOW EXCEEDED
When Monitored:
With the ignition on.
Set Condition:
The fuel temperature sensor signal voltage is below 0.8 volt.
POSSIBLE CAUSES
INTERMITTENT CONDITION
FUEL TEMPERATURE SENSOR (FUEL INJECTION PUMP) SHORTED TO GROUND INTER-
NALLY
FUEL TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
FUEL TEMPERATURE SENSOR SIGNAL AND GROUND CIRCUITS SHORTED TOGETHER
INTERNAL FUEL INJECTION PUMP TEST
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, erase ECM DTCs.
Turn the ignition off, wait 10 seconds, then turn the ignition on.
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.
Turn the ignition on.
With the DRB, erase ECM DTCs and then read ECM DTCs.
Did DTC P0180 FUEL TEMPERATURE SENSOR SRC HIGH EXCEEDED set?
All
Yes
→
Replace the Fuel Injection Pump in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
48
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 Temperature Sensor Signal
circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Fuel Temperature Sensor Signal circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Fuel Injection Pump harness connector.
Measure the resistance between the Fuel Temperature Sensor Signal circuit and
Sensor Ground circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Fuel Temperature Sensor Signal and Ground circuits
for a short together.
Perform ROAD TEST VERIFICATION - VER-2.
5
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.
49
DRIVEABILITY - DIESEL
P0180-FUEL TEMPERATURE SENSOR SRC LOW EXCEEDED —
Continued
TEST
ACTION
APPLICABILITY
6
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.
50
DRIVEABILITY - DIESEL
P0180-FUEL TEMPERATURE SENSOR SRC LOW EXCEEDED —
Continued
Symptom:
P0235-TURBOCHARGER BOOST SENSOR PLAUSIBILITY
When Monitored and Set Condition:
P0235-TURBOCHARGER BOOST SENSOR PLAUSIBILITY
When Monitored:
With the engine speed between 600 and 870 RPM.
Set Condition:
When the engine is idling, the turbocharger boost pressure sensor input
does not agree with the atmospheric pressure sensor input for at least 7 seconds.
POSSIBLE CAUSES
INTERMITTENT CONDITION
HIGH RESISTANCE IN THE BOOST PRESSURE SENSOR SIGNAL CIRCUIT
HIGH RESISTANCE IN THE BOOST PRESSURE SENSOR GROUND CIRCUIT
HIGH RESISTANCE IN THE 5-VOLT SUPPLY CIRCUIT
TURBOCHARGER BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, erase ECM DTCs.
Turn the ignition off, wait 30 seconds, then start and idle the engine for at least 30
seconds.
NOTE: Engine idle speed must be below 870 RPM.
With the DRB, read ECM DTCs.
Did this DTC reset?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the Turbocharger Boost Pressure/IAT Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Boost Pressure Sensor Signal circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Boost Pressure Sensor Signal circuit for high resis-
tance.
Perform ROAD TEST VERIFICATION - VER-2.
51
DRIVEABILITY - DIESEL
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