Jeep XJ. Manual — part 826
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
Turn the ignition on.
Measure the voltage of the Throttle Position Sensor Signal circuit in the Throttle
Position Sensor harness connector.
Is the voltage above 5.2 volts?
All
Yes
→
Repair the Throttle Position Sensor Signal circuit for a short to
battery voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
4
Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
Connect a jumper wire between the Throttle Position Sensor Signal circuit and the
Sensor ground circuit.
With the DRBIII
t, monitor the Throttle Position Sensor voltage.
Turn the ignition on.
Is the voltage below 0.5 volts?
All
Yes
→
Replace the Throttle Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
5
Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
Measure the resistance of the Sensor ground circuit in the Throttle Position Sensor
harness connector to ground.
Is the resistance below 30 ohms?
All
Yes
→
No
→
Repair the Sensor ground circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6
Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the Throttle Position Sensor Signal circuit between the
Throttle Position Sensor harness connector and the PCM harness connector.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the Throttle Position Sensor Signal circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
7
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
65
DRIVEABILITY - GAS
P0123-THROTTLE POSITION SENSOR VOLTAGE HIGH —
Continued
TEST
ACTION
APPLICABILITY
8
Turn the ignition on.
With the DRBIII
t, monitor the Throttle Position Sensor voltage.
Slowly open the throttle from the idle position to the wide open throttle position.
Does voltage start at approximately 0.8 volts and go above 3.5 volts with a smooth
voltage change?
All
Yes
→
No
→
Replace the Throttle Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
9
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 DRBIII
t
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 DRBIII
t Freeze Frame information. 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 POWERTRAIN VERIFICATION TEST VER - 5.
No
→
Test Complete.
66
DRIVEABILITY - GAS
P0123-THROTTLE POSITION SENSOR VOLTAGE HIGH —
Continued
Symptom:
P0125-CLOSED LOOP TEMP NOT REACHED
When Monitored and Set Condition:
P0125-CLOSED LOOP TEMP NOT REACHED
When Monitored:
With battery voltage greater than 10.4 volts, after engine is started, for
ten minutes.
Set Condition:
The engine temperature does not go above 18 deg. F by 10 minutes after
the engine is started. Two trips are required to set this DTC.
POSSIBLE CAUSES
ECT SENSOR (OUT OF CALIBRATION)
LOW COOLANT LEVEL
THERMOSTAT OPERATION
ECT WIRING HARNESS INTERMITTENT
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTCs.
Is the Good Trip Counter for P0125 displayed and equal to zero?
All
Yes
→
No
→
2
NOTE: If a ECT DTC set along with this code, diagnose the ECT DTC first.
NOTE: Inspect the ECT terminals and related PCM terminals. Ensure the
terminals are free from corrosion and damage.
NOTE: The best way to diagnose this DTC is to allow the vehicle to sit
overnight outside in order to have a totally cold soaked engine.
Note: Extremely cold outside ambient temperatures may have caused this
DTC to set.
WARNING: Never open the cooling system when the engine is hot. The
system is under pressure. Extreme burns or scalding may result. Allow the
engine to cool before opening the cooling system.
Check the coolant system to make sure that the coolant is in good condition and at
the proper level.
Is the coolant level and condition OK?
All
Yes
→
No
→
Inspect the vehicle for a coolant leak and add the necessary
amount of coolant.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
67
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
3
Note: For this test to be valid, the thermostat must be operating correctly.
Note: This test works best if performed on a cold engine (cold soak)
Turn the ignition on.
With the DRBIII
t in sensors, read the Eng Coolant Tmp Deg value. If the engine was
allowed to sit overnight (cold soak), the temperature value should be a sensible value
that is somewhere close to the surrounding temperature (ambient temperature).
Note: If engine coolant temperature is above 82°C (180°F), allow the engine
to cool until 65°C (150°F) is reached.
Start the engine.
During engine warm-up, monitor the Eng Coolant Tmp Deg value. The temp deg
value change should be a smooth transition from start up to normal operating temp
82°C (180°F). The value should reach at least 82°C (180°F).
Was the Eng Coolant Tmp Deg value increase a smooth transition and did it reach at
least 180°?
All
Yes
→
No
→
Replace the Engine Coolant Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
4
Note: This test works best if performed on a cold engine (cold soak)
Turn the ignition on.
With the DRBIII
t, read the Eng Coolant Tmp Deg value. If the engine was allowed
to sit overnight (cold soak), the temperature value should be a sensible value that is
somewhere close to the ambient temperature.
Note: If engine coolant temperature is above 82°C (180°F), allow the engine
to cool until 65°C (150°F) is reached.
Start the Engine.
During engine warm-up monitor the Eng Coolant Tmp Deg value. The temp deg
value change should be a smooth transition from start up to normal operating temp
82°C (180°F) . Also monitor the actual coolant temperature with a thermometer.
NOTE: As the engine warms up to operating temperature, the actual coolant
temperature (thermometer reading) and the Eng Coolant Tmp Deg in the
DRBIII
t values should stay relatively close to each other.
Using the appropriate service information, determine the proper opening tempera-
ture of the thermostat.
Did the thermostat open at the proper temperature?
All
Yes
→
Test Complete.
No
→
Replace the thermostat.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
5
Turn the ignition off.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wiring harness connectors. Look for
broken, bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB) that may apply.
Perform a wiggle test on the related wiring harnesses with the engine running.
Watch for the Good Trip Counter to change to 0.
Were any problems found?
All
Yes
→
Repair wiring harness/connectors as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
Test Complete.
68
DRIVEABILITY - GAS
P0125-CLOSED LOOP TEMP NOT REACHED —
Continued
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