Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMERCURY2010MARINER HYBRID, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 10 (AUTOMATIC TRANSMISSION - 6F35)DIAGNOSIS AND TESTINGPINPOINT TESTS - OSC EQUIPPED VEHICLEPINPOINT TESTSPINPOINT TEST E: TRANSAXLE SOLENOID PRESSURE CONTROL CIRCUIT

2010 Mercury Mariner Hybrid, AWD

Pinpoint Test E: Transaxle Solenoid Pressure Control Circuit

2010 Mercury Mariner Hybrid, AWDSECTION Pinpoint Test E: Transaxle Solenoid Pressure Control Circuit

WARNING: This page is about a different variant/trim than selected.

NOTE: Refer to the TRANSAXLE VEHICLE HARNESS CONNECTOR illustration within the TRANSAXLE CONNECTOR LAYOUTS procedure.

E1 CHECK FOR VOLTAGE AT THE TRANSAXLE VEHICLE HARNESS CONNECTOR
- Disconnect: Transaxle Vehicle Harness C168a.
- Use a mirror to inspect both ends of the connector for damage or pushed-out pins, corrosion, loose wires and missing or damaged seals.
- Ignition ON.
- Measure the voltage between the transaxle vehicle harness C168a-5, circuit CET25 (BU/GN) and ground.
  
  Fig 1: Measuring Voltage Between Transaxle Vehicle Harness C168A-5, Circuit CET25 (BU/GN) And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
1. Yes: INSTALL a new Transaxle Pressure Control Solenoid. REFER to SOLENOIDS . RECONNECT all components. TEST the system for normal operation.
2. 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 C168-5, circuit CET25 (BU/GN).
  
  Fig 2: Measuring Resistance Between PCM Transaxle C175T-50, Circuit CET25 (BU/GN) And Transaxle Vehicle Harness C168-5, Circuit CET25 (BU/GN)
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
1. Yes: GO to E3 .
2. 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 C168a-5, circuit CET25 (BU/GN) and ground.
  
  Fig 3: Measuring Resistance Between Transaxle Vehicle Harness C168A-5, Circuit CET25 (BU/GN) And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10, 000 ohms?
1. 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.
2. No: REPAIR circuit CET25 (BU/GN) for a short to ground. RECONNECT all components. TEST the system for normal operation.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.