Section 17-01: Lighting, Exterior
1996 F-150, F-250, F-350, F-Super Duty Motorhome and Bronco Workshop Manual
DIAGNOSIS AND TESTING

Component Tests, Backup Lamps

NOTE: Use Rotunda 73 Digital Multimeter 105-R0051 or equivalent when performing the following component tests.

 

Transmission Range (TR) Sensor/Switch

  1. Disconnect transmission range sensor wiring harness connector.

  1. Attach ohmmeter to sensor terminals.

  1. Cycle switch as required to test all functions of terminals under test.

  1. Check sensor resistance between terminals.



    COMPONENT TESTING PROCEDURE
    To TestConnect Self-Powered Test Lamp or Ohmmeter to TerminalsMove Switch to These PositionsA Good Switch Will Indicate
    Transmission Circuit359 (GY/R)
    and
    199 (LB/Y)    		Park
    Reverse
    Neutral
    Drive
    Second (2)
    First (1)    		3770-4607 ohms
    1304-1593 ohms
    660-807 ohms
    361-442 ohms
    190-232 ohms
    78-95 ohms
    Backup Lamp Circuit298 (P/O)
    and
    140 (BK/PK)    		Park
    Reverse
    Neutral
    Drive
    Second (2)
    First (1)    		Greater than 100k ohms
    Less than 5.0 ohms
    Greater than 100k ohms
    Greater than 100k ohms
    Greater than 100k ohms
    Greater than 100k ohms
    Starter Relay Circuit32 (R/LB)
    and
    33 (W/PK)    		Park
    Reverse
    Neutral
    Drive
    Second (2)
    First (1)    		Less than 5.0 ohms
    Greater than 100k ohms
    Less than 5.0 ohms
    Greater than 100k ohms
    Greater than 100k ohms
    Greater than 100k ohms
    4x4 Shift on the Fly Circuit463 (R/W)
    and
    57 (BK)    		Park
    Reverse
    Neutral
    Drive
    Second (2)
    First (1)    		Open Circuit
    Open Circuit
    Closed Circuit
    Open Circuit
    Open Circuit
    Open Circuit

 

Park/Neutral Position Switch

  1. Disconnect park/neutral position switch wiring harness connector.

  1. Attach a volt-ohmmeter to the switch terminals.

  1. Cycle switch as required to test all functions of the terminals under test.

  1. Check switch resistance between terminals.



    COMPONENT TESTING PROCEDURE
    To TestConnect Self-Powered Test Lamp or Ohmmeter to TerminalsMove Switch to These PositionsA Good Switch Will Indicate
    Backup Lamp Circuit298 (P/O)
    and
    140 (BK/PK)    		Park
    Reverse
    Neutral
    Drive
    Low    		Greater than 100k ohms
    Less than 5.0 ohms
    Greater than 100k ohms
    Greater than 100k ohms
    Greater than 100k ohms
    Starter Relay Circuit32 (R/LB)
    and
    33 (W/PK)    		Park
    Reverse
    Neutral
    Drive
    Low    		Less than 5.0 ohms
    Greater than 100k ohms
    Less than 5.0 ohms
    Greater than 100k ohms
    Greater than 100k ohms
    Electronic Shift Control Circuit463 (R/W)
    and
    Case Ground    		Park
    Reverse
    Neutral
    Drive
    Low    		Open Circuit
    Open Circuit
    Closed Circuit
    Open Circuit
    Open Circuit