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Home >> Mercury >> 2009 >> Milan AWD V6-3.0L >> Repair and Diagnosis >> Transmission and Drivetrain >> Automatic Transmission/Transaxle >> Testing and Inspection >> Pinpoint Tests >> FNR5 - Automatic Transaxle/Transmission >> Pinpoint Test D: Electronic PCA

Pinpoint Test D: Electronic PCA




Pinpoint Tests - OSC Equipped Vehicle

PINPOINT TEST D: ELECTRONIC PCA

NOTE: Refer to the Transaxle Main Valve Body Vehicle Harness Connector illustration Transaxle Connector Layouts Transaxle Connector Layouts.

NOTE: Read and record all DTCs. All Transmission Range (TR) sensor and Output Shaft Speed (OSS) DTCs must be repaired before entering output state control.

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D1 ELECTRONIC DIAGNOSTICS SETUP


- Ignition OFF.
- Select PARK.
- Check to make sure transaxle main valve body vehicle harness C1534 is fully seated, terminals are fully engaged in the connector and in good condition before proceeding.
- Install the Transmission Fluid Pressure Gauge into the line tap.
- Connect the scan tool.
- Start the engine.
- Enter the following diagnostic mode on the scan tool: DataLogger Mode.
- Does the vehicle enter the DataLogger Mode?

Yes
REMAIN in DataLogger Mode. GO to D2 .

No
REPEAT procedure to ENTER DataLogger Mode. If vehicle did not enter output state control, REFER to Computers and Control Systems Information for diagnosis of Transmission Control Module (TCM).

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D2 SOLENOID FUNCTIONAL TEST


- Monitor the Transmission Fluid Pressure Gauge.
- Select PCA PID.
- Increase engine speed above 1,500 rpm.
- Change psi value.
- Monitor the Transmission Fluid Pressure Gauge and the commanded pressure.
- Select another value 50-150 psi.
- Does the pressure reading match the commanded pressure?

Yes
CLEAR DTCs. TEST the system for normal operation.

No
GO to D3.

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D3 CHECK THE TRANSAXLE MAIN VALVE BODY VEHICLE HARNESS FOR A SHORT TO POWER


- Ignition OFF.
- Disconnect: Transaxle C1534.
- Disconnect: TCM C2352A.
- Ignition ON.
- Measure the voltage between transaxle main valve body vehicle harness C1534-7, circuit CET42 (GN/VT) and ground.




- Measure the voltage between transaxle main valve body vehicle harness C1534-2, circuit CET43 (GY) and ground.




- Is any voltage present?

Yes
REPAIR the circuit for a short to power. TEST the system for normal operation.

No
GO to D4.

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D4 CHECK THE TRANSAXLE MAIN VALVE BODY VEHICLE HARNESS FOR A SHORT TO GROUND


- Ignition OFF.
- Measure the resistance between transaxle main valve body vehicle harness C1534-7, circuit CET42 (GN/VT) and ground.




- Measure the resistance between transaxle main valve body vehicle harness C1534-2, circuit CET43 (GY) and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to D5.

No
REPAIR the circuit for a short to ground. TEST the system for normal operation.

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D5 CHECK THE TRANSAXLE VEHICLE HARNESS FOR AN OPEN


- Measure the resistance between transaxle main valve body vehicle harness C1534-7, circuit CET42 (GN/VT) and TCM C2352A-5, circuit CET42 (GN/VT).




- Measure the resistance between transaxle main valve body vehicle harness C1534-2, circuit CET43 (GY) and TCM C2352A-6, circuit CET43 (GY).




- Is the resistance less than 5 ohms?

Yes
GO to D6.

No
REPAIR the circuit for an open. TEST the system for normal operation.

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D6 CHECK THE TRANSAXLE MAIN VALVE BODY INTERNAL HARNESS FOR A SHORT TO GROUND


- Remove the transmission fluid pan. Refer to Transmission Fluid Pan Service and Repair.
- Disconnect: Pressure Control Solenoid A (PCA) Solenoid Electrical Connector.
- Measure the resistance between transaxle main valve body internal harness C1534-2 (component side, transaxle internal harness) and ground.




- Measure the resistance between transaxle main valve body internal harness C1534-7 (component side, transaxle internal harness) and ground.




- Are the resistances greater than 10,000 ohms?

Yes
GO to D7.

No
INSTALL a new transaxle main valve body internal harness. TEST the system for normal operation.

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D7 CHECK THE TRANSAXLE MAIN VALVE BODY INTERNAL HARNESS FOR AN OPEN


- Measure the resistance between transaxle main valve body internal harness PCA connector pin 2 (component side, transaxle internal harness) and transaxle main valve body internal harness C1534-2.




- Measure the resistance between transaxle main valve body internal harness PCA connector pin 7 (component side, transaxle internal harness), and transaxle main valve body internal harness C1534-7.




- Are the resistances less than 5 ohms?

Yes
GO to D8.

No
INSTALL a new transaxle main valve body internal harness. TEST the system for normal operation.

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D8 CHECK SOLENOID RESISTANCE AT THE SOLENOID


- Measure the resistance between PCA solenoid pins.




- Is the resistance between 2.4 and 7.3 ohms?

Yes
GO to D9.

No
INSTALL a new PCA solenoid. TEST the system for normal operation.

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D9 CHECK THE SOLENOID FOR A SHORT TO GROUND


- Measure the resistance between the PCA solenoid pins and the solenoid body.




- Is the resistance greater than 10,000 ohms?

Yes
REFER to Diagnosis By Symptom Diagnosis By Symptom for diagnosis of pressure concerns. TEST the system for normal operation.

No
INSTALL a new PCA solenoid. TEST the system for normal operation.

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