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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 883 (Four Wheel Drive (4WD) Systems) >> Diagnostic Tests >> Four Wheel Drive (4WD) Systems >> Pinpoint Tests >> Pinpoint Test A: Functional Test >> Pinpoint Test A: Functional Test

Pinpoint Test A: Functional Test

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 CHECK FOR 4WD INDICATOR PROVE-OUT 
    • Start the vehicle and observe the 4WD indicator.
    • Does the 4WD indicator illuminate for 3 seconds and then turn OFF? 
    1. YES  : Go to  A2.
    2. NO  : REFER to INSTRUMENT CLUSTER article for further diagnosis of the instrument cluster (IC).
  2. A2 CHECK FOR 4WD INDICATOR FLASHING 
    • Allow vehicle to idle for 5 minutes.
    • Observe the 4WD indicator.
    • Does the 4WD indicator flash? 
    1. YES  : Go to Pinpoint Test G .
    2. NO  : Allow vehicle engine to continue idling. Go to  A3 .
  3. A3 CHECK FOR 4WD INDICATOR ON CONTINUOUSLY 
    • Observe the 4WD indicator.
    • Does the 4WD indicator stay on continuously? 
    1. YES  : Go to Pinpoint Test G .
    2. NO  : Go to  A4.
  4. A4 CHECK FOR VALID THROTTLE POSITION 
    • Key in OFF position.
    • Enter the following diagnostic mode on the diagnostic tool: PID/DATA Monitor and Record
    • Key in ON position.
    • Monitor the throttle position while opening and closing the throttle.
    • Does the throttle position match the PID value? 
    1. YES  : Go to  A5.
    2. NO  : REFER to INTRODUCTION - GASOLINE ENGINES or INTRODUCTION -- HYBRID ENGINES article.
  5. A5 CHECK FOR CORRECT WHEEL SPEEDS 
    • Monitor the wheel speed PIDs while driving the vehicle at a constant speed of 48 km/h (30 mph).
    • Are all 4 wheel speeds within 3 km/h (1.8 mph) of each other? 
    1. YES  : Go to  A6.
    2. NO  : Go to Pinpoint Test I .
  6. A6 CHECK THE VEHICLE ACCELERATION IN A STRAIGHT LINE 
    • Carry out 3 accelerations from 0-48 km/h (0-30 mph) in a straight line (one each with low, medium, and high throttle).
    • Does the vehicle pulsate or shudder while accelerating? 
    1. YES  : Go to Pinpoint Test H .
    2. NO  : Go to  A7.
  7. A7 CHECK THE VEHICLE TURNING ABILITY 
    • Drive the vehicle in a fully locked turn, on dry pavement, at 8 km/h (5 mph).
    • Does the vehicle bind in the turn or resist turning? 
    1. YES  : Go to Pinpoint Test H .
    2. NO  : Go to  A8.
  8. A8 CHECK FOR TORQUE AT THE REAR WHEELS 
    • Enter the following diagnostic mode on the diagnostic tool: Active Commands
    • Command the active torque coupling to a constant 100% applied.
    • Drive the vehicle in a fully locked turn, on dry pavement, at 8 km/h (5 mph).
    • Does the vehicle bind in the turn or resist turning? 
    1. YES  : The concern can not be duplicated at this time. RETURN the vehicle to the customer.
    2. NO  : Go to Pinpoint Test F .
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