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Home >> Chrysler >> 2004 >> Sebring LXi, 2D Convertible >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Powertrain Diagnostic Procedures - NGC DRIVEABILITY Symptoms, NGC DRIVEABILITY Diagnostic Tests DTCS P0016 To P0461 - Except Coupe >> DRIVEABILITY - NGC - Diagnostic Tests >> DTC P0121: Throttle Position Sensor #1 Performance >> Possible Causes

Possible Causes

GOOD TRIP EQUAL TO ZERO

HIGH RESISTANCE IN MAP (K6) 5 VOLT SUPPLY CIRCUIT

RESISTANCE TO GROUND IN MAP (K6) 5 VOLT SUPPLY CIRCUIT

MAP SENSOR

HIGH RESISTANCE IN (K1) MAP SIGNAL CIRCUIT

RESISTANCE TO GROUND IN (K1) MAP SIGNAL CIRCUIT

HIGH RESISTANCE IN (K4) MAP GROUND CIRCUIT

PCM

TP SENSOR OPERATION

HIGH RESISTANCE IN TP SENSOR (K6) 5 VOLT SUPPLY CIRCUIT

RESISTANCE TO GROUND IN TP SENSOR (K6) 5 VOLT SUPPLY CIRCUIT

TP SENSOR

HIGH RESISTANCE IN (K22) TP SIGNAL CIRCUIT

RESISTANCE TO GROUND IN (K22) TP SENSOR SIGNAL CIRCUIT

HIGH RESISTANCE IN TP (K4) SENSOR GROUND CIRCUIT

PCM

DIAGNOSTIC PROCEDURE - DTC P0121-THROTTLE POSITION SENSOR #1 PERFORMANCE

Test Action
1
NOTE: Diagnose any TP Sensor or MAP Sensor component DTCs before continuing.
NOTE: The throttle plate and linkage must be free from binding and carbon build up.
NOTE: Ensure the throttle plate is at the idle position.
Ignition on, engine not running.With the DRBIII®, read DTCs and record the related Freeze Frame data.Is the Good Trip Counter displayed and equal to zero?
  1. Yes --> Go To 2
  2. No --> Refer to the INTERMITTENT CONDITION  symptom in the Driveability category.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
2 Start the engine.
With the DRBIII®, monitor the MAP sensor voltage.
Snap the throttle.
Does the MAP Sensor voltage vary from below 2.0 volts at idle to above 3.5 volts at WOT?
  1. Yes --> Go to 3
  2. No --> Go To 11
3 Ignition on, engine not running.
With the DRBIII®, monitor the TP Sensor voltage while slowly depressing the throttle pedal from the idle position to the wide open throttle position.
Does the voltage start approximately at 0.8 volts and go above 3.5 volts with a smooth transition?
  1. No --> Go To 4
  2. Yes --> Refer to the INTERMITTENT CONDITION  symptom in the Driveability category.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
4 Turn the ignition off.
Disconnect the TP Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the (K6) 5 volt supply circuit from the TP Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
  1. Yes --> Go To 5
  2. No --> Repair the TP Sensor (K6) 5 volt supply circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
5 Turn the ignition off.
Disconnect the TP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the (K6) 5 volt supply circuit at the TP Sensor harness connector.
Is the resistance above 100 kohms?
  1. Yes --> Go To 6
  2. No --> Repair the (K6) 5 volt supply circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
6 Turn the ignition off.
Disconnect the TP Sensor harness connector.
With the DRBIII®, monitor the TP sensor voltage.
Ignition on, engine not running.
Connect a jumper wire between the (K22) TP Signal circuit and the (K4) Sensor ground circuit.
Does the TP Sensor voltage change from approximately 4.9 volts to below 0.5 of a volt?
  1. Yes --> Replace the Throttle Position Sensor

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .

  2. No --> Go to 7.
7 Turn the ignition off.
Disconnect the TP Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the (K22) TP Signal circuit from the TP Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
  1. Yes --> Go To 8
  2. No --> Repair (K22) TP Sensor Signal circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
8 Turn the ignition off.
Disconnect the TP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (K22) TP Signal circuit in the TP Sensor harness connector.
Is the resistance above 100 kohms?
  1. Yes --> Go To 9
  2. No --> Repair the (K22) TP Sensor Signal circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
9 Turn the ignition off.
Disconnect the TP Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the (K4) Sensor ground circuit from the TP Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
  1. Yes --> Go To 10
  2. No --> Repair the (K4) Sensor ground circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
10
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
If there are no possible causes remaining, view repair.Repair:Replace and program the Powertrain Control Module in accordance with the Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
11 Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the (K6) 5 volt supply circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
  1. Yes --> Go To 12
  2. No --> Repair the MAP (K6) 5 volt supply circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
12 Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (K6) 5 volt supply circuit at the MAP Sensor harness connector.
Is the resistance above 100 kohms?
  1. Yes --> Go To 13
  2. No --> Repair the short to ground in the (K6) 5 volt supply circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
13 Turn the ignition off.
Disconnect the MAP Sensor harness connector.
With the DRBIII®, monitor the MAP Sensor voltage.
Ignition on, engine not running.
Connect a jumper wire between the (K1) MAP Sensor Signal circuit and the (K4) Sensor ground circuit.
Cycle the ignition switch from off to on.
With the DRBIII®, monitor the MAP Sensor voltage.
Does the DRBIII® display MAP voltage from approximately 4.9 volts to below 0.5 volt?
  1. Yes --> Repair the MAP Sensor.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .

  2. No --> Go To 14
14 Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the (K1) MAP Sensor Signal circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
  1. Yes --> Go To 15
  2. No --> Repair the (K1) MAP Sensor Signal circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
15 Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (K1) MAP Sensor Signal circuit at the MAP Sensor harness connector.
Is the resistance above 100 kohms?
  1. Yes --> Go To 16
  2. No --> Repair the (K1) MAP Sensor Signal circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
16 Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the (K4) MAP Sensor Ground circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
  1. Yes --> Go To 17
  2. No --> Repair the (K4) MAP Sensor Ground circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
17
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
If there are no possible causes remaining, view repair.Repair:Replace and program the Powertrain Control Module in accordance with the Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
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