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 4.4721 volts.
One Trip Fault.
POSSIBLE CAUSES
THROTTLE POSITION SENSOR SWEEP
INTERMITTENT CONDITION
(K22) TP SIGNAL CIRCUIT SHORTED TO (K7) 5 VOLT SUPPLY CIRCUIT
(K22) TP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
TP SENSOR INTERNAL FAILURE
(K167) SENSOR GROUND CIRCUIT OPEN
(K22) TP 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 DRBIIIt, read the TP Sensor voltage.
Is the voltage above 4.5 volts?
All
Yes → Go To 2
No → Go To 8
2 Turn the ignition off.
Disconnect the TP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the (K22) TP Signal circuit and the (K7) 5 Volt
Supply circuit in the TP Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes → Repair the short to the (K7) 5 volt Supply circuit in the (K22) TP
Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 3
78
DRIVEABILITY - NGC
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