Pinpoint Test E: AWD System Functional Test
WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
AWD LOCKED mode is not intended for driving on hard/dry surfaces.
Test Step
- E1 CHECK AWD LOCKED INDICATOR PROVE-OUT
- Key in ON position.
- Does the AWD LOCKED indicator illuminate at prove out?
Result / Action to Take
- Yes : GO to E2.
- No : CHECK the instrument cluster. REFER to INSTRUMENT CLUSTER AND PANEL ILLUMINATION .
- E2 CHECK AWD AUTO OPERATION
- Select AWD AUTO.
- Is the AWD LOCKED indicator off?
- Yes : GO to E5.
- No : GO to E3.
- E3 CHECK FOR DTCs
- Connect the diagnostic tool.
- Carry out the on-demand self test.
- Are DTCs present?
- Yes : REFER to the 4WD CONTROL MODULE (PCM) DTC INDEX for diagnosis.
- No : GO to E4.
- E4 CHECK FOR WIND-UP IN AWD AUTO
- Drive the vehicle on a dry, hard surface in turns.
- Is wind-up present in turns?
- Yes : GO to PINPOINT TEST B .
- No : GO to PINPOINT TEST C .
- E5 CHECK THE TRANSFER CASE CLUTCH DUTY CYCLE PID
- Enter the following diagnostic mode on the diagnostic tool: PID/DATA Monitor and Record.
- Monitor the transfer case clutch duty cycle (pulse width modulated [PWM]) PID.
- Does the PID indicate 2 to 4% clutch application at closed throttle?
- Yes : GO to E6.
- No : GO to PINPOINT TEST B .
- E6 CHECK SHAFT SPEED PIDs
- Enter the following diagnostic mode on the diagnostic tool: PID/DATA Monitor and Record.
- Monitor the transfer case front and rear shaft speeds.
- Drive the vehicle 30 km/h (18 mph).
- Record and compare the front wheel speed and the rear wheel speed.
- Do the front shaft speed and rear shaft speed values match within 1.5 km/h (1 mph)?
- Yes : GO to E7.
- No : CHECK the ABS system. REFER to ANTI-LOCK CONTROL and VERIFY that the 4 road tire sizes match.
- E7 CHECK THE THROTTLE POSITION PID
- Enter the following diagnostic mode on the diagnostic tool: PID/DATA Monitor and Record.
- Monitor the throttle position PID from the 4x4 module.
- Key ON, engine OFF.
- Slowly move throttle from closed throttle to WOT and observe the 4WD module throttle sensor PID.
- Does the PID value vary between 0% at closed throttle and 100% at WOT?
- Yes : GO to E8.
- No : CHECK the throttle position sensor and/or PCM. See INTRODUCTION - GASOLINE article.
- E8 CHECK FOR WIND-UP IN TURNS ON THROTTLE
- Drive the vehicle on a dry, hard surface, executing turns while applying the throttle.
- Is wind-up present?
- Yes : CHECK the transfer case. REFER to TRANSFER CASE - ELECTRONIC SHIFT .
- No : GO to E9.
- E9 CHECK AWD LOCKED OPERATION
- Select AWD LOCKED.
- Does the AWD LOCKED indicator illuminate correctly?
- Yes : GO to E10.
- No : GO to E11.
- E10 CHECK FOR AWD LOCKED WIND-UP
- Drive the vehicle on a dry, hard surface in turns.
- Is wind-up present in turns?
- Yes : GO to E13.
- No : GO to PINPOINT TEST B .
- E11 CHECK FOR DTCs
- Connect the diagnostic tool.
- Carry out the 4WD control module on-demand self test.
- Are DTCs present?
- Yes : REFER to the 4WD CONTROL MODULE (PCM) DTC INDEX for diagnosis.
- No : GO to E12.
- E12 CHECK FOR WIND-UP IN AWD LOCKED ON THROTTLE
- Drive the vehicle on a dry, hard surface in turns while applying the throttle.
- Is wind-up present in turns?
- Yes : GO to PINPOINT TEST C .
- No : GO to PINPOINT TEST B .
- E13 CHECK AWD AUTO OPERATION
- Select AWD AUTO.
- Does the message center display "AWD AUTO"?
- Yes : The AWD system is operating correctly.
- No : GO to E14.
- E14 CHECK FOR DTCs
- Carry out the on-demand self test.
- Are DTCs retrieved?
- Yes : REFER the 4WD Control Module (PCM) DTC Index.
- No : GO to E15.
- E15 CHECK FOR WIND-UP IN AWD AUTO
- Drive the vehicle on a dry, hard surface in turns.
- Is wind-up present in turns?
- Yes : GO to PINPOINT TEST C .
- No : GO to PINPOINT TEST B .