Test Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Ford RV Cutaway, 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Strict observance of posted speed limits and attention to driving conditions are mandatory when carrying out the road test. Failure to follow these instructions may result in personal injury

This pinpoint test is intended to diagnose the following:
low engine coolant level
Cooling system flow restriction
ECT sensor
EOT sensor

AX1: CHECK FOR AN ENGINE COOLANT LOSS OR AN ENGINE OVERHEATING CONCERN
- Carry out a visual inspection. Refer to INSPECTION AND VERIFICATION .
- Verify the pressure relief cap is capable of holding system pressure.
- Verify that the coolant and cooling system maintenance has been carried out as recommended.
- Is the engine overheating or loosing coolant?
  Yes: Refer to ENGINE COOLING SYSTEM - F250-F550 SUPER DUTY to continue diagnosis if the engine overheats or the loss of coolant symptoms.
  
  No: Go to next step.
AX2: CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
- Retrieve and record all DTCs.
- Record the freeze frame data.
- Are there any other DTCs present?
  Yes: Disregard the current DTC at this time. GO to DTC Index to address the next DTC.
  
  No: Go to next step.
AX3: CHECK ECT OR EOT SENSOR FOR DAMAGE
- Inspect the ECT and EOT sensor and circuits at the sensor and PCM for the following:
  - pinched, shorted, and corroded wiring and pins
  - oil or water contamination
  - crossed sensor wires
  - contaminated or damaged sensor
- Is a concern present?
  Yes: Repair as necessary. Clear the DTCs. Repeat the self-test.
  
  No: Go to next step.
AX4: CHECK FOR CORRECT ECT AND EOT SENSOR OPERATION
NOTE: Verify that no accessories are in use (engine block or oil heaters).
- Clear all the DTCs.
- Cold soak the vehicle at ambient temperature for a minimum of 10 hours.
- Ignition ON, engine OFF.
- Access the PCM and monitor the ECT (TEMP) PID.
- Access the PCM and monitor the EOT (TEMP) PID.
- Access the PCM and monitor the RPM (RPM) PID.
- Access the PCM and monitor the MFDES (MASS) PID.
- Record the ECT and EOT sensor temperature values.
- Drive the vehicle at an engine speed greater than 1,800 RPM and 15 mg/stroke MFDES for at least 15 minutes. Select the appropriate gear to achieve the operating conditions.
- Does the ECT PID and EOT PID temperature values change by a minimum of 6°C (10°F) from when the ignition ON, engine OFF valves were recorded?
  Yes: Install a new oil cooler kit. Refer to OIL COOLER .
  
  No: Install a new ECT sensor or EOT sensor in question. Clear the DTCs. Repeat the self-test.