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Pinpoint Test A: Transmission Fluid Pressure Sensors

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: An internal fluid leak, incorrectly installed transmission fluid pan filter, cut/damaged mechatronic assembly feed tube O-rings or a transmission fluid pump leaking or not operating correctly can cause a difference in the pressure readings. Always check the fluid pan filter for correct installation, the mechatronic assembly bolt torque for correct torque setting, O-rings and feed tubes for damage and leaks, and the fluid pump for correct operation prior to installing a new or the original mechatronic assembly. If the feed tubes, O-rings or fluid pan filter are damaged or if the fluid pump is not operating correctly, install new components as required. Recheck the pressures using the pinpoint test. If the pressure readings are still incorrect, install a new mechatronic assembly.
NOTE: The transmission control module (TCM) is integrated into the mechatronic assembly. If installing a new transaxle or a mechatronic assembly, the TCM will need to be checked and recalibrated (reflashed) to the latest level calibration available.
  1. A1 PRESSURE SENSOR DIAGNOSTICS 
    • Key in OFF position.
    • Check to make sure the transaxle harness connector is fully seated, pins are fully engaged in connector and in good condition before proceeding.
    • Connect the scan tool.
    • Key in ON position.
    • Enter the following diagnostic mode on the scan tool: PIDs: Main Pressure Sensor (PCA_MES) and Pulley 2 Pressure Sensor (PCC_MES).
    • Are the pressure sensor readings between 0-80 kPa (0-12 psi)? 
    1. Yes  : Pressure sensors are OK. GO to A2.
    2. No  : Pressure sensors are faulty. INSTALL a new mechatronic assembly.
  2. A2 CHECK PRESSURE AT IDLE 
    • Key in START position.
    • Engine speed at idle.
    • Enter the following diagnostic mode on the scan tool: PIDs: Engine Speed (RPMTCM), Main Pressure Sensor (PCA_MES) and Pulley 2 Pressure (secondary) Sensor (PCC_MES).
    • Monitor and record the PIDs.
    • Are the presssure sensor readings less than 300 kPa (44 psi)? 
    1. Yes  : CHECK pan filter for restriction or for correct installation. If pan filter is installed correctly and not restricted, INSTALL a new fluid pump. REFER to the notes preceding this pinpoint test.
    2. No  : GO to A3.
  3. A3 CHECK PRESSURE AT IDLE 
    • Enter the following diagnostic mode on the scan tool: PIDs: Engine Speed (RPMTCM), Main Pressure Sensor (PCA_MES) and Pulley 2 Pressure (secondary) Sensor (PCC_MES).
    • Monitor and record the PIDs.
    • Is the main pressure sensor less than the pulley 2 (secondary) sensor pressure? 
    1. Yes  : GO to A4.
    2. No  : GO to  A5.
  4. A4 CHECK PRESSURE AT IDLE 
    • Enter the following diagnostic mode on the scan tool: PIDs: Engine Speed (RPMTCM), Main Pressure Sensor (PCA_MES) and Pulley 2 Pressure (secondary) Sensor (PCC_MES).
      • NOTE: If the main pressure is less than the pulley 2 pressure the difference cannot be greater than 400 kPa (58 psi).
    • Monitor and record the PIDs.
    • Is the difference between the main pressure sensor and the pulley 2 (secondary pressure sensor) less than 400 kPa (58 psi)? 
    1. Yes  : GO to A5.
    2. No  : INSTALL a new mechatronic assembly. (Refer to the note preceding this pinpoint test.)
  5. A5 CHECK PRESSURE OFF IDLE 
    • Engine speed above 2,000 rpm.
    • Enter the following diagnostic mode on the scan tool: PIDs: Main Pressure Sensor (PCA_MES) and Pulley 2 Pressure (secondary) Sensor (PCC_MES).
    • Monitor and record the PIDs.
    • Is the main and pulley 2 pressures greater than 300 kPa (44 psi)? 
    1. Yes  : GO to A6.
    2. No  : INSTALL a new mechatronic assembly. (Refer to the note preceding this pinpoint test.)
  6. A6 CHECK PRESSURE OFF IDLE 
    • Engine speed above 2,000 rpm.
    • Enter the following diagnostic mode on the scan tool: PIDs: Engine Speed (RPMTCM), Main Pressure Sensor (PCA_MES) and Pulley 2 Pressure (secondary) Sensor (PCC_MES).
    • Monitor and record the PIDs.
    • Is the main pressure less than the pulley 2 pressure? 
    1. Yes  : GO to A7.
    2. No  : GO to  A8.
  7. A7 CHECK PRESSURE OFF IDLE 
    • Engine speed above 2,000 rpm.
    • Enter the following diagnostic mode on the scan tool: PIDs: Engine Speed (RPMTCM), Main Pressure Sensor (PCA_MES) and Pulley 2 Pressure (secondary) Sensor (PCC_MES).
      • NOTE: If the main pressure is less than the pulley 2 pressure the difference cannot be greater than 400 kPa (58 psi).
    • Monitor and record the PIDs.
    • Is the difference between the main pressure and the pulley 2 pressure less than 400 kPa (58 psi)? 
    1. Yes  : GO to A8.
    2. No  : INSTALL a new mechatronic assembly. (Refer to the note preceding this pinpoint test.)
  8. A8 CHECK MAIN PRESSURE DURING TEST DRIVE 
    • Drive the vehicle and monitor the diagnostic tool.
    • Engine RPM should be above 2,100.
    • Compare the difference between PIDs: (PCA MES) and (PCC MES).
    • Is the difference between PIDs: (PCA MES) and (PCC MES) less than 300 kPa (44 psi)? 
    1. Yes  : CLEAR all DTCs. ROAD TEST to verify if concern is still present. Concern could be intermittent.
    2. No  : INSPECT the transaxle internally for damaged O-rings or seals. INSPECT the varaitors for damage. REPAIR as required. REFER to TRANSAXLE DISASSEMBLY .
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