Pinpoint Test E: Transaxle Solenoid Pressure Control Circuit

WARNING: This page is about a different car, the 2012 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Refer to the Transaxle Vehicle Harness Connector illustration TRANSAXLE CONNECTOR LAYOUTS .

E1 CHECK FOR VOLTAGE AT THE TRANSAXLE VEHICLE HARNESS CONNECTOR

NOTE: Do not use a solenoid control circuit that may be at fault. Failure to jump pin 5 to a known good solenoid control circuit can cause incorrect diagnostic results. For additional information, REFER to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS for a fault listing.

Ignition OFF.
Disconnect: Transaxle Vehicle Harness C1520A.
Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.

Using the chart, connect a fused jumper between one of the 7 solenoid control circuit pins on the transmission vehicle harness C1520A and C1520A-5.

Transmission Vehicle Harness C1520A	Solenoid Control Circuit
C1520A-8	Shift Solenoid A (SSA) CET05 (BU/GN)
C1520A-9	Shift Solenoid B (SSB) CET06 (GN/BN)
C1520A-4	Shift Solenoid C (SSC) CET07 (GY/OG)
C1520A-10	Shift Solenoid D (SSD) CET08 (BN/WH)
C1520A-7	Shift Solenoid E (SSE) CET18 (GY/YE)
C1520A-3	Line Pressure Control (LPC) solenoid CET09 (YE/VT)
C1520A-6	Torque Converter Clutch (TCC) solenoid CET10 (BU/GY)

Fig 1: Connecting Fused Jumper Between 7 Solenoid Control Circuit Pins On Transmission Vehicle Harness C1520A And C1520A-5

Courtesy of FORD MOTOR CO.

Ignition ON. Measure the voltage between the transaxle vehicle harness C1520A-5 circuit CET25 (BU/GN) harness side to ground.
Is the voltage greater than 10 volts?
- Yes: INSTALL a new Line Pressure Control (LPC) solenoid. REFER to SOLENOIDS . RECONNECT all components. TEST the system for normal operation.
- No: GO to E2.

E2 CHECK THE TRANSAXLE SOLENOID PRESSURE CONTROL CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: PCM Transaxle Harness C175T.
- Measure the resistance between the PCM transaxle C175T-50, circuit CET25 (BU/GN) and transaxle vehicle harness C1520A-5, circuit CET25 (BU/GN).
  
  Fig 2: Measuring Resistance Between PCM Transaxle C175T-50, Circuit CET25 (BU/GN) And Transaxle Vehicle Harness C1520A-5, Circuit CET25 (BU/GN)
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
  - Yes: GO to E3.
  - No: REPAIR circuit CET25 (BU/GN) for an open. RECONNECT all components. TEST the system for normal operation.
E3 CHECK THE TRANSAXLE SOLENOID POWER CONTROL CIRCUIT FOR A SHORT TO GROUND
- Measure the resistance between the transaxle vehicle harness C1520A-5, circuit CET25 (BU/GN) and ground.
  
  Fig 3: Measuring Resistance Between Transaxle Vehicle Harness C1520A-5, Circuit CET25 (BU/GN) And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10, 000 ohms?
  - Yes: INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - 2.5L or ELECTRONIC ENGINE CONTROLS - 3.0L (4V) . RECONNECT all components. TEST the system for normal operation.
  - No: REPAIR circuit CET25 (BU/GN) for a short to ground. RECONNECT all components. TEST the system for normal operation.