Pinpoint Test I: Vehicle Binds In A Turn Or Resists Turning
WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Conduct Steps 1 through 7 outlined in Inspection and Verification prior to performing this test.
- I1 CHECK FOR TORQUE AT THE REAR WHEELS
- Key in OFF position.
- Disconnect: Active Torque Coupling C3254.
- Drive the vehicle in a straight line on dry pavement.
- Is a pulsation or shudder still present?
Yes : REFER to DRIVELINE SYSTEM-GENERAL INFORMATION for additional axle diagnosis.
No : GO to I2.
- I2 CHECK TO SEE IF THE ACTIVE TORQUE COUPLING SOLENOID IS BEING COMMANDED ON
- Connect: Active Torque Coupling C3254.
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: PID/DATA Monitor and Record.
- Drive the vehicle in tight turns on dry pavement while monitoring the active torque coupling duty cycle.
- Is the duty cycle greater than 20%?
Yes : GO to I3.
No : GO to PINPOINT TEST G .
- I3 CHECK FOR THE CORRECT WHEEL SPEEDS
- Monitor the wheel speed PIDs while driving the vehicle at a constant speed of 48 km/h (30 mph).
- Are all four wheel speeds within 3 km/h (1.8 mph) of each other?
Yes : GO to I4.
No : GO to PINPOINT TEST J .
- I4 CHECK FOR A VALID THROTTLE POSITION
- Key in OFF position.
- Key in the ON position with the engine OFF.
- Monitor the throttle position while opening and closing the throttle.
- Does the throttle position match the PID value?
Yes : GO to I5.
No : REFER to the INTRODUCTION - GASOLINE article or INTRODUCTION -- HYBRID ESCAPE & HYBRID MARINER article to diagnose the engine control system.
- I5 CHECK FOR CORRECT 4WD CONTROL MODULE OPERATION
- Disconnect the 4WD control module.
- Check for:
- corrosion.
- pushed-out pins.
- Connect the 4WD 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 4WD control module. REFER to FOUR WHEEL DRIVE (4WD) CONTROL MODULE in this article. 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.