Jeep XJ. Manual — part 825
Symptom:
P0122-THROTTLE POSITION SENSOR VOLTAGE LOW
When Monitored and Set Condition:
P0122-THROTTLE POSITION SENSOR VOLTAGE LOW
When Monitored:
With the ignition on and battery voltage above 10.4 volts.
Set Condition:
Throttle Position Sensor voltage at the PCM is 0.1 volt for 1.3 seconds.
POSSIBLE CAUSES
THROTTLE POSITION SENSOR SWEEP
INTERMITTENT CONDITION
5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
5 VOLT SUPPLY CIRCUIT OPEN
THROTTLE POSITION SENSOR INTERNAL FAILURE
THROTTLE POSITION SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
THROTTLE POSITION SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT
TCM INTERNALLY SHORTED THROTTLE POSITION SIGNAL CIRCUIT
PCM 5 VOLT SUPPLY CIRCUIT
PCM THROTTLE POSITION SENSOR SIGNAL
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read the Throttle Position Sensor voltage.
Is the voltage below 0.2 volts?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
Turn the ignition on.
Measure the voltage of the 5 Volt Supply circuit in the TPS harness connector.
Is the voltage between 4.5 to 5.5 volts?
All
Yes
→
No
→
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DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
With the DRBIII
t, monitor the Throttle Position Sensor voltage.
Turn the ignition on.
Is the voltage above 4.5 volts?
All
Yes
→
Replace the Throttle Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
4
Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
Measure the resistance of the Throttle Position Sensor Signal circuit in the Throttle
Position Sensor harness connector to ground.
Is the resistance below 100 ohms?
All
Yes
→
Repair the Throttle Position Sensor Signal circuit for a short to
ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
5
Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
Measure the resistance between the Throttle Position Sensor Signal circuit and the
Sensor ground circuit in the Throttle Position Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→
Repair the Throttle Position Sensor Signal circuit for a short to
the Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
6
Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
Disconnect the TCM harness connector.
With the DRBIII
t, monitor the Throttle Position Sensor voltage.
Turn the ignition on.
Is the voltage above 4.5 volts?
All
Yes
→
Replace the Transmission Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
7
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
8
Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
Measure the resistance of the 5 Volt Supply circuit in the Throttle Position Sensor
harness connector to ground.
Is the resistance below 100 ohms?
All
Yes
→
Repair the 5 Volt Supply circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
62
DRIVEABILITY - GAS
P0122-THROTTLE POSITION SENSOR VOLTAGE LOW —
Continued
TEST
ACTION
APPLICABILITY
9
Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the 5 Volt Supply circuit between the Throttle Position
Sensor harness connector and the PCM harness connector.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the 5 Volt Supply circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
10
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
11
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.
12
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.
63
DRIVEABILITY - GAS
P0122-THROTTLE POSITION SENSOR VOLTAGE LOW —
Continued
Symptom:
P0123-THROTTLE POSITION SENSOR VOLTAGE HIGH
When Monitored and Set Condition:
P0123-THROTTLE POSITION SENSOR VOLTAGE HIGH
When Monitored:
With the ignition on and battery voltage above 10.4 volts.
Set Condition:
Throttle Position Sensor voltage at the PCM goes above 4.5 volts for 3.2
seconds.
POSSIBLE CAUSES
THROTTLE POSITION SENSOR SWEEP
INTERMITTENT CONDITION
THROTTLE POSITION SENSOR SIGNAL CIRCUIT SHORTED TO 5 VOLT SUPPLY CIRCUIT
THROTTLE POSITION SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
THROTTLE POSITION SENSOR INTERNAL FAILURE
SENSOR GROUND CIRCUIT OPEN
THROTTLE POSITION SENSOR SIGNAL CIRCUIT OPEN
PCM
TEST
ACTION
APPLICABILITY
1
NOTE: Ensure the throttle is fully closed and free from binding or carbon
build up.
Start the engine.
With the DRBIII
t, read the Throttle Position Sensor voltage.
Is the voltage above 4.5 volts?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
Measure the resistance between the Throttle Position Sensor Signal circuit and the
5 Volt Supply circuit in the Throttle Position Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→
Repair the Throttle Position Sensor Signal circuit for a short to
the 5 Volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
64
DRIVEABILITY - GAS
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