Section 07-14A: Manual Lever Position Sensor
1994 Mustang Workshop Manual
DIAGNOSIS AND TESTING

Pinpoint Test — 3.8L Engine (OBD II)

  

PINPOINT TEST B: MANUAL LEVER POSITION SENSOR

 

B1 AODE MLP SENSOR ELECTRONIC DIAGNOSTICS

Yes
REMOVE tool. GO to B2.

No
ADJUST sensor as outlined. After adjustments, PLACE transmission gear selector in PARK. CLEAR DTC and REFER to Powertrain Control/Emissions Diagnosis Manual Quick-Test.

 

B2 CHECK ELECTRICAL SIGNAL OPERATION

Yes
GO to B3.

No
REFER to Powertrain Control/Emissions Diagnosis Manual for diagnosis of NO reference voltage.

 

B3 CHECK CONTINUITY OF MLP SENSOR HARNESS CIRCUITS

  • Turn ignition switch OFF.

     CAUTION: Do not pry connector. Press button and pull up on vehicle harness.

  • Disconnect MLP sensor.
  • Inspect for damage or pushed out pins, corrosion or loose wires.
  • Install Breakout Box 007-00033. Leave powertrain control module disconnected.
  • Disconnect powertrain control module . Inspect for damaged or pushed out pins, corrosion or loose wires.

    NOTE: Refer to the schematics and charts preceding this pinpoint test.

  • Measure resistance between powertrain control module test Pin 91 at Breakout Box and SIG RTN circuit at MLP sensor vehicle harness connector.
  • Measure resistance between powertrain control module test Pin 64 at Breakout Box and MLP signal circuit at MLP sensor vehicle harness connector.
  • Is each resistance less than 5 ohms?
Yes
GO to B4.

No
SERVICE open circuit(s). REMOVE Breakout Box. RECONNECT all components. ERASE codes. REFER to Powertrain Control/Emissions Diagnosis Manual Quick Test.

 

B4 CHECK MLP SENSOR CIRCUIT FOR SHORTS TO POWER AND GROUND

  • Ensure Breakout Box 007-00033 is installed and powertrain control module disconnected.
  • Ensure MLP sensor harness connector is disconnected.

    NOTE: Refer to schematics and charts preceding this pinpoint test.

  • Measure resistance between powertrain control module test Pin 64 and test Pins 71/97, 51/76/77/103 and 91 at the Breakout Box.
  • Measure resistance between powertrain control module test Pin 64 at Breakout Box and chassis ground.
  • Is each resistance greater than 10,000 ohms?
Yes
GO to B5.

No
SERVICE short circuit. REMOVE Breakout Box. RECONNECT all components. ERASE codes. REFER to Powertrain Control/Emissions Diagnosis Manual Quick Test.

 

B5 CHECK OPERATION OF MLP SENSOR

  • Disconnect MLP sensor harness connector at the transmission.
  • Connect Transmission Tester 007-00085 with MLP Overlay/Cable 007-00086 to MLP sensor.
  • Using procedures provided with tester, verify sensor functions in all positions. Check continuity and resistance in all positions. Check RUN/START, back-up lamps and optional switch function.
  • Is the MLP sensor OK?


    Transmission Range Selector Lever Position Resistance (Ohms) Volts*
    Min Max
    P 3770 4607 4.41
    R 1304 1593 3.60
    N 660 807 2.93
    D 361 442 2.09
    2 190 232 1.37
    1 78 95 0.68
    * May vary ± 10% due to sensor and VREF variations.
Yes
Concern is not in sensor. If directed here from Diagnosis by Symptom, RETURN to Routine. If diagnosing a DTC, REFER to the Powertrain Control/Emissions Diagnosis Manual to diagnose intermittent concerns.

No
REPLACE MLP sensor as outlined. REFER to Section 07-01. ERASE codes. REFER to Powertrain Control/Emissions Diagnosis Manual Quick Test.