Chrysler PT Cruiser 2001 Service Manual Supplement page 2525

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 0.7
seconds.
TPS VOLTAGE CHANGE NOT SMOOTH
TPS CONNECTORS/HARNESS INTERMITTENT (D)
TPS HARNESS/CONNECTORS INTERMITTENT (C)
TPS HARNESS/CONNECTORS OBSERVABLE
THROTTLE POSITION SENSOR GROUND CIRCUIT OPEN
TPS SIGNAL OR S/C SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE
THROTTLE POSITION SENSOR SIGNAL CIRCUIT OPEN
TPS SIGNAL CIRCUIT SHORTED TO 5-VOLT SUPPLY CIRCUIT
TPS (VOLTAGE < 1.0 VOLT)
POWERTRAIN CONTROL MODULE
TEST
1 Turn the ignition on.
With the DRB, read the Throttle Position Sensor voltage.
Is the Throttle Position Sensor voltage above 4.5 volts?
Yes → Go To 2
→ Go To 8
No
2 Turn the ignition off.
Disconnect the TPS connector harness connector.
Disconnect the PCM connector harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Sensor Ground circuit between the TPS harness
connector and the Powertrain Control Module harness connector.
Is the resistance below 5.0 ohms?
Yes → Go To 3
→ Repair the sensor ground circuit for an open.
No
POSSIBLE CAUSES
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - GAS
65
APPLICABILITY
All
All