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Home >> Chrysler >> 2004 >> Sebring GTC, Automatic >> 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 P0071: Ambient Temp Sensor Performance >> Possible Causes

Possible Causes

GOOD TRIP EQUAL TO ZERO

(K25) AAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE

AMBIENT AIR TEMPERATURE SENSOR VOLTAGE BELOW 1.0 VOLT

(K25) AAT SIGNAL CIRCUIT OPEN

(K4) SENSOR GROUND CIRCUIT OPEN

(K25) AAT SIGNAL CIRCUIT SHORTED TO GROUND

(K25) AAT SIGNAL CIRCUIT SHORTED TO (K4) SENSOR GROUND

PCM LOW

PCM HIGH

DIAGNOSTIC PROCEDURE - P0071-AMBIENT TEMP SENSOR PERFORMANCE

TEST ACTION
1 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
NOTE: Visually inspect both the component and the PCM connectors. Look for damage, partially broken wires and backed out or corroded terminals
Turn the ignition off.Disconnect the Ambient Air Temp Sensor harness connector.Ignition on, engine not running.Measure the voltage of the (K25) AAT Signal circuit in the Ambient Air Temperature Sensor harness connector.Is the voltage above 5.2 volts?
  1. Yes --> Repair the short to battery voltage in the (K25) AAT Signal circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .

  2. No --> Go To 3
3 Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Ignition on, engine not running.
With the DRBIII®, read the Ambient Air Temperature Sensor voltage.
Is the voltage above 4.9 volts?
  1. Yes --> Go To 4
  2. No --> Go To 7
4 Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Using a jumper wire, jumper across the Ambient Air Temperature Sensor harness connector.
Ignition on, engine not running.
With the DRBIII®, read the Ambient Air Temperature voltage.
Is the voltage below 1.0 volt?
  1. Yes --> Replace the Ambient Air Temperature Sensor.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .

  2. No --> Go To 5
5 Turn the ignition off.
Disconnect the Ambient Air Temperature 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 (K25) AAT Signal circuit from the Ambient Air Temperature Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
  1. Yes --> Go To 6
  2. No --> Repair the open in the (K25) AAT Signal circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
6 Turn the ignition off.
Disconnect the Ambient Air Temperature 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 (K167) Sensor ground circuit from the Ambient Air Temperature Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
  1. Yes --> NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Replace and program the Powertrain Control Module in accordance with the Service Information.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .

  2. No --> Repair the open in the (K4) Sensor ground circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
7 Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (K25) AAT Signal circuit.
Is the resistance below 100 ohms?
  1. Yes --> Repair the short to ground in the (K25) AAT Signal circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .

  2. No --> Go To 8
8 Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the (K25) AAT Signal circuit and the (K4) Sensor ground circuit in the Ambient Air Temperature Sensor harness connector.
Is the resistance below 100 ohms?
  1. Yes --> Repair the Sensor ground shorted to the (K25) AAT Signal circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .

  2. No --> NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage or terminal push out. Repair as necessary. Replace and program the Powertrain Control Module in accordance with the Service Information.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
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