Ford Fusion: Transmission Cooling - 6-Speed Automatic Transmission – 6F35 / Transmission Cooling. Diagnosis and Testing

Inspection and Verification

1. Verify the customer concern.
   

1. Visually inspect for obvious signs of mechanical or electrical damage.
   

1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step
   

1. If the cause is not visually evident, verify the symptom and refer to the Symptom Chart.
   

DTC Chart

DTC chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Symptom Chart — Transmission Cooling

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Check Transmission Fluid Level and Condition

NOTICE: The vehicle should not be driven if the transmission fluid level indicator shows the transmission fluid below the minimum transmission fluid level mark or internal failure could result.

If the vehicle has been operated for an extended period of time, at highway speeds, in city traffic, in hot weather or while pulling a trailer, the transmission fluid may need to cool down to obtain an accurate reading.

The transmission fluid level reading on the transmission fluid level indicator will differ depending on operating and ambient temperatures. The correct reading should be within the normal operating temperature range.

Transmission Fluid Level Check

To check the transmission fluid level,
REFER to: Transmission Fluid Level Check (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F35, General Procedures).

High Transmission Fluid Level

A transmission fluid level that is too high may cause the transmission fluid to become aerated due to the churning action of the rotating internal parts. This will cause erratic control pressure, foaming, loss of transmission fluid from the vent tube and possible transmission malfunction and/or damage. If an overfill reading is indicated,
REFER to: Transmission Fluid Level Check (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F35, General Procedures).

Low Transmission Fluid Level

A low transmission fluid level could result in poor transmission engagement, slipping, malfunction and/or damage. This could also indicate a leak in one of the transmission seals or gaskets.

Transmission Fluid Condition Check

1. Check the transmission fluid level,
   REFER to: Transmission Fluid Level Check (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F35, General Procedures).

1. Remove a small amount of transmission fluid from the transmission oil leveling plug hole and allow the transmission fluid to drip onto a white facial tissue and examine the stain.
   

1. If evidence of solid material is found, the transmission fluid pan should be removed for further inspection.
   

1. If transmission fluid contamination or transmission failure is confirmed by the sediment in the bottom of the transmission fluid pan, repair the transmission and clean the transmission fluid cooler tubes and the transmission fluid cooler.
   

1. If the transmission is to be overhauled or if installing a new transmission, the transmission fluid cooler must be backflushed.
   REFER to: Transmission Fluid Cooler - Backflushing and Cleaning (307-02A Transmission Cooling - 6-Speed Automatic Transmission – 6F35, General Procedures).

Pinpoint Tests

Pinpoint Test A: P2681

For 1.5L GTDI
Refer to Wiring Diagrams Cell 27 for schematic and connector information.

For 2.0L GTDI
Refer to Wiring Diagrams Cell 24 for schematic and connector information.

A1 RETRIEVE AND RECORD ALL DTCS

Using the diagnostic scan tool, retrieve all DTCs. Was DTC P2681 set? Yes GO to A2 No The issue may not be the Transmission Fluid Heater Coolant Control Valve electrical system. REFER to symptom chart.

A2 CHECK BJB (BATTERY JUNCTION BOX) FUSE 12 (15A)

Ignition OFF. Remove BJB fuse 12 (15A). Check BJB fuse 12 (15A). Is the resistance less than 5 ohms? Yes GO to A4 No GO to A3

A3 CHECK THE TRANSMISSION FLUID HEATER COOLANT CONTROL VALVE POWER CIRCUIT FOR A SHORT TO GROUND

Disconnect Transmission Fluid Heater Coolant Control Valve C1702 . Inspect for damaged or pushed-out terminals. Measure. Click to display connectors Positive Lead Measurement / Action Negative Lead   C1702-1 Ground Is the resistance greater than 10,000 ohms? Yes GO to A5 No REPAIR the circuit.

A4 CHECK THE TRANSMISSION FLUID HEATER COOLANT CONTROL VALVE POWER CIRCUIT FOR AN OPEN

Install the fuse. Disconnect Transmission Fluid Heater Coolant Control Valve C1702 . Ignition ON. Measure. Click to display connectors Positive Lead Measurement / Action Negative Lead   C1702-1 Ground Is voltage greater than 10 volts? Yes GO to A6 No REPAIR the circuit.

A5 CHECK THE TRANSMISSION FLUID HEATER COOLANT CONTROL VALVE CONTROL CIRCUIT FOR A SHORT TO GROUND

Disconnect PCM C1915B 1.5L GTDI. Disconnect PCM C1381B 2.0L GTDI. Measure. Click to display connectors Positive Lead Measurement / Action Negative Lead   C1702-2 Ground Is the resistance greater than 10,000 ohms? Yes GO to A6 No REPAIR the circuit.

A6 CHECK THE TRANSMISSION FLUID HEATER COOLANT CONTROL VALVE CONTROL CIRCUIT FOR AN OPEN

Disconnect PCM C1915B 1.5L GTDI. Disconnect PCM C1381B 2.0L GTDI. Measure. Click to display connectors Positive Lead Measurement / Action Negative Lead   C1702-2   C1915B-40   C1702-2   C1381B-81 Is the resistance less than 5 ohms? Yes GO to A7 No REPAIR the circuit.

A7 CHECK THE TRANSMISSION FLUID HEATER COOLANT CONTROL VALVE

NOTE: The resistance specification below is for a temperature range between -40°C - 200°C (-40°F - 392°F) Measure. Click to display connectors Positive Lead Measurement / Action Negative Lead C1702-1, component side C1702-2, component side Is the resistance between 15 - 25 ohms? Yes    Click here to access Guided Routine (PCM). Internet Explorer version 11 or greater is required to perform this Pinpoint Test. PERFORM the Transmission Strategy Download, REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F35, General Procedures). No INSTALL a new Transmission Fluid Heater Coolant Control Valve. REFER to: Transmission Fluid Heater Coolant Control Valve (303-03A Engine Cooling - 1.5L EcoBoost (118kW/160PS) – I4, Removal and Installation). REFER to: Transmission Fluid Heater Coolant Control Valve (303-03B Engine Cooling - 2.0L EcoBoost (184kW/250PS) – MI4, Removal and Installation).