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Home >> Lincoln >> 2012 >> MKZ Hybrid >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Four Wheel Drive (4WD) Systems) >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems >> Pinpoint Tests >> Pinpoint Test F: DTC P1635 >> Pinpoint Test F: DTC P1635

Pinpoint Test F: DTC P1635

WARNING: This page is about a different variant/trim than selected.
WARNING: When directed to drive the vehicle as part of this test, drive the vehicle on a hard surface in an area without traffic to prevent a crash. Failure to follow these instructions may result in personal injury.
NOTE: Carry out a thorough INSPECTION AND VERIFICATION  as outlined before carrying out this pinpoint test.
  1. F1 CHECK THE RECENT TIRE USAGE 
    • Check with customer about recent tire usage or installation.
    • Has a tire been installed on the vehicle recently that was not originally supplied with the vehicle? 
    • Yes:  INFORM the customer to only use tires of the type supplied with the vehicle. CLEAR the DTCs. REPEAT the self-test.
    • No:  GO to F2.
  2. F2 CHECK TIRE SIZE AND BRAND 
    • Check the tire size and the brand of tire.
    • Are all 4 tires the same size and brand? 
    • Yes:  GO to F3.
    • No:  INSTALL tires that are the same size and brand. INFORM the customer to only use the same size tires and brand. CLEAR the DTCs. REPEAT the self-test.
  3. F3 CHECK TIRE AIR PRESSURES 
    • Check the air pressure in all 4 tires.
    • Are all 4 tires at the recommended air pressure? 
    • Yes:  GO to F4.
    • No:  ADJUST the tire air pressures. CLEAR the DTCs. REPEAT the self-test. INFORM the customer to maintain the correct tire air pressure.
  4. F4 CHECK FOR CORRECT WHEEL SPEEDS 
    • Connect the scan tool.
    • Enter the following diagnostic mode on the scan tool: DataLogger - 4X4 Control Module.
    • While driving the vehicle at 48 km/h (30 mph), monitor the following wheel speed sensor PIDs:
      • Left Front Wheel Speed Sensor (LF_WSPD)
      • Left Rear Wheel Speed Sensor (LR_WSPD)
      • Right Front Wheel Speed Sensor (RF_WSPD)
      • Right Rear Wheel Speed Sensor (RR_WSPD)
    • Are all 4 wheel speeds within 2 km/h (1.2 mph) of each other? 
  5. F5 CHECK FOR CORRECT 4X4 CONTROL MODULE OPERATION 
    • Disconnect: 4X4 Control Module C3253.
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect the 4X4 control module and make sure it seats correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
    • Yes:  INSTALL a new 4X4 control module. REFER to 4X4 CONTROL MODULE . CLEAR the DTCs. REPEAT the self-test.
    • No:  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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