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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1616 (Parking Aid System) >> Diagnostic Tests >> Parking Aid >> Pinpoint Tests >> Pinpoint Test G: DTC C1992 - Vehicle Speed Circuit Failure

Pinpoint Test G: DTC C1992 - Vehicle Speed Circuit Failure

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Parking Aid for schematic and connector information.

Normal Operation 

The Parking aid module (PAM) receives the vehicle speed signal (VSS) on circuit 679 GY/BK which is hard wired from the PCM.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST G: DTC C1992 - VEHICLE SPEED CIRCUIT FAILURE 

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. G1 RECHECK THE PAM DTCs 
    • Enter the following diagnostic mode on the diagnostic tool: PAM Self-Test
    • Clear the DTCs. Repeat the PAM self-test.
    • Is DTC C1992 still present? 
    1. YES  : Go to  G2.
    2. NO  : The system is operating correctly at this time. The DTC may have been set due to a previous condition.
  2. G2 CHECK THE VSS CIRCUIT FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Parking Aid System Inline Harness C406
    • Key in ON position.
      • Fig 1: Measuring Resistance
      GF0047684Courtesy of FORD MOTOR CO.
    • Measure the resistance between the parking aid system inline harness C406-10, circuit 679 (GY/BK), harness side and ground.
    • Is resistance less than 5 ohms? 
    1. YES  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  G3.
  3. G3 CHECK THE VSS CIRCUIT FOR AN OPEN 
    • Key in OFF position.
      • Fig 2: Measuring Resistance
      GF0047685Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCMC175b-1, circuit 676 (PK/OG), harness side and the parking aid system inline harness C406-6, circuit 676 (PK/OG), harness side.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  G4.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. G4 CHECK FOR CORRECT PAM OPERATION 
    • Disconnect the PAM connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the PAM connector and make sure it seats correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new PAM. REFER to Parking Aid Module (PAM) . TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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