Chrysler 300M 2002 Service Manual page 2510

Symptom:
P0123-THROTTLE POSITION SENSOR #1 HIGH
When Monitored and Set Condition:
P0123-THROTTLE POSITION SENSOR #1 HIGH
When Monitored: With the ignition on. Battery voltage greater than 10 volts.
Set Condition: Throttle Position Sensor voltage at the PCM is greater than 4.47 volts.
One Trip Fault.
THROTTLE POSITION SENSOR SWEEP
INTERMITTENT CONDITION
TP SENSOR SIGNAL CIRCUIT SHORTED TO 5 VOLT SUPPLY CIRCUIT
TP SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
TP SENSOR INTERNAL FAILURE
SENSOR GROUND CIRCUIT OPEN
TP SENSOR SIGNAL CIRCUIT OPEN
PCM
TEST
1 NOTE: Ensure the throttle is fully closed and free from binding or carbon
build up.
Start the engine.
With the DRBIII , read the TPS voltage.
Is the voltage above 4.5 volts?
Yes → Go To 2
→ Go To 8
No
2 Turn the ignition off.
Disconnect the TPS harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the TPS Signal circuit and the 5 Volt Supply circuit
in the TPS harness connector.
Is the resistance below 100 ohms?
Yes → Repair the short to the 5 Volt Supply circuit in the Throttle
→ Go To 3
No
POSSIBLE CAUSES
ACTION
Position Sensor Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - NGC
81
APPLICABILITY
All
All