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Fluid Pressure Sensor/Switch

Transmission and Drivetrain › Automatic Transmission/Transaxle
Unified entry — merged from multiple cross-listed pages in the original manual.
Procedures
Variable Line Pressure Sensor - Removal4 steps
Fig. 1
Fig. 1
Fig. 2
Fig. 2
  1. Remove the valve body from the transmission. Valve Body - Removal
  2. Remove the electrical connectors from the pressure control solenoid (1)(Figure 1) and the line pressure sensor (2).
  3. Remove the screws (6) holding the pressure control solenoid (1) and line pressure sensor (2) to the valve body.
  4. Remove the pressure control solenoid and line pressure sensor from the valve body.
Variable Line Pressure Sensor - Installation4 steps
Fig. 1
Fig. 1
Fig. 2
Fig. 2
  1. Install the pressure control solenoid (1)(Figure 1) and line pressure sensor (2) into the valve body.
  2. Install the screws (6) to hold the pressure control solenoid (1) and line pressure sensor (2) to the valve body.
  3. Install the electrical connectors to the pressure control solenoid (1) and the line pressure sensor (2).
  4. Install the valve body into the transmission. Valve Body - Installation
Transmission Solenoid And Pressure Switch Assembly - Removal4 steps
ℹ NOTE
If the Solenoid/Pressure Switch Assembly is being replaced, the Quick Learn Procedure must be performed.
Fig. 1
Fig. 1
Fig. 2
Fig. 2
Fig. 3
Fig. 3
Fig. 4
Fig. 4
  1. Raise vehicle on hoist.
  2. Remove valve body assembly from transmission. Valve Body - Removal
  3. Remove Solenoid/Pressure Switch Assembly retaining screws (2) from solenoid(Figure 1).
  4. Remove Solenoid/Pressure Switch Assembly (1) and screen from valve body (2)(Figure 2).
Transmission Solenoid And Pressure Switch Assembly - Installation3 steps
ℹ NOTE
If the Solenoid/Pressure Switch assembly is being replaced, the Quick Learn Procedure must be performed.
Fig. 1
Fig. 1
Fig. 2
Fig. 2
Fig. 3
Fig. 3
Fig. 4
Fig. 4
  1. Install Solenoid/Pressure Switch Assembly (1)(Figure 1) and screen (3) to the separator and transfer plates.
  2. Install and tighten retaining screws (2) (Figure 2) to 5.5 Nm (50 in. lbs.) torque.
  3. Install valve body. Valve Body - Installation
Transmission Solenoid And Pressure Switch Assembly - Operationreference
Fig. 1
Fig. 1
OPERATION SOLENOIDS The solenoids receive electrical power from the Transmission Control Relay through a single wire. The TCM energizes or operates the solenoids individually by grounding the return wire of the solenoid needed. When a solenoid is energized, the solenoid valve shifts, and a fluid passage is opened or closed (vented or applied), depending on its default operating state. The result is an apply or release of a frictional element. The 2/4 and UD solenoids are normally applied, which allows fluid to pass through in their relaxed or "off" state. By design, this allows transmission limp-in (P,R,N,2) in the event of an electrical failure. The continuity of the solenoids and circuits are periodically tested. Each solenoid is turned on or off depending on its current state. An inductive spike should be detected by the TCM during this test. If no spike is detected, the circuit is tested again to verify the failure. In addition to the periodic testing, the solenoid circuits are tested if a speed ratio or pressure switch error occurs. PRESSURE SWITCHES The TCM relies on three pressure switches to monitor fluid pressure in the L/R, 2/4, and OD hydraulic circuits. The primary purpose of these switches is to help the TCM detect when clutch circuit hydraulic failures occur. The range for the pressure switch closing and opening points is 11-23 psi. Typically the switch opening point will be approximately one psi lower than the closing point. For example, a switch may close at 18 psi and open at 17 psi. The switches are continuously monitored by the TCM for the correct states (open or closed) in each gear as shown in the following chart: PRESSURE SWITCH STATES A Diagnostic Trouble Code (DTC) will set if the TCM senses any switch open or closed at the wrong time in a given gear. The TCM also tests the 2/4 and OD pressure switches when they are normally off (OD and 2/4 are tested in 1st gear, OD in 2nd gear, and 2/4 in 3rd gear). The test simply verifies that they are operational, by looking for a closed state when the corresponding element is applied. Immediately after a shift into 1st, 2nd, or 3rd gear with the engine speed above 1000 rpm, the TCM momentarily turns on element pressure to the 2/4 and/or OD clutch circuits to identify that the appropriate switch has closed. If it doesn't close, it is tested again. If the switch fails to close the second time, the appropriate Diagnostic Trouble Code (DTC) will set.
Variable Line Pressure Sensor - Descriptionreference
Fig. 1
Fig. 1
Fig. 2
Fig. 2
DESCRIPTION The line pressure sensor (2)(Figure 1) is mounted on the top of the valve body, next to the pressure control solenoid (1). The TCM utilizes a closed-loop system to control transmission line pressure. The system contains a variable force style solenoid, the Pressure Control Solenoid. The solenoid is duty cycle controlled by the TCM to vent the unnecessary line pressure supplied by the oil pump back to the sump. The system also contains a variable pressure style sensor, the Line Pressure Sensor, which is a direct input to the TCM. The line pressure solenoid monitors the transmission line pressure and completes the feedback loop to the TCM. The TCM uses this information to adjust its control of the pressure control solenoid to achieve the desired line pressure.
Transmission Solenoid And Pressure Switch Assembly - Descriptionreference
Fig. 1
Fig. 1
Fig. 2
Fig. 2
DESCRIPTION The Solenoid/Pressure Switch Assembly (1)(Figure 1) is inside the transmission and mounted to the valve body assembly. The assembly consists of four solenoids that control hydraulic pressure to the L/R, 2/4, OD, and UD friction elements (transmission clutches), and the torque converter clutch. The reverse clutch is controlled by line pressure from the manual valve in the valve body. The solenoids are contained within the Solenoid/Pressure Switch Assembly, and can only be serviced by replacing the assembly. The solenoid assembly also contains pressure switches that monitor and send hydraulic circuit information to the TCM. Likewise, the pressure switches can only be service by replacing the assembly.
Variable Line Pressure Sensor - Removal4 steps
Fig. 1
Fig. 1
Fig. 2
Fig. 2
  1. Remove the valve body from the transmission. Valve Body - Removal
  2. Remove the electrical connectors from the pressure control solenoid (1)(Figure 1) and the line pressure sensor (2).
  3. Remove the screws (6) holding the pressure control solenoid (1) and line pressure sensor (2) to the valve body.
  4. Remove the pressure control solenoid and line pressure sensor from the valve body.
Variable Line Pressure Sensor - Installation4 steps
Fig. 1
Fig. 1
Fig. 2
Fig. 2
  1. Install the pressure control solenoid (1)(Figure 1) and line pressure sensor (2) into the valve body.
  2. Install the screws (6) to hold the pressure control solenoid (1) and line pressure sensor (2) to the valve body.
  3. Install the electrical connectors to the pressure control solenoid (1) and the line pressure sensor (2).
  4. Install the valve body into the transmission. Valve Body - Installation
Transmission Solenoid And Pressure Switch Assembly - Removal4 steps
ℹ NOTE
If the Solenoid/Pressure Switch Assembly is being replaced, the Quick Learn Procedure must be performed.
Fig. 1
Fig. 1
Fig. 2
Fig. 2
Fig. 3
Fig. 3
Fig. 4
Fig. 4
  1. Raise vehicle on hoist.
  2. Remove valve body assembly from transmission. Valve Body - Removal
  3. Remove Solenoid/Pressure Switch Assembly retaining screws (2) from solenoid(Figure 1).
  4. Remove Solenoid/Pressure Switch Assembly (1) and screen from valve body (2)(Figure 2).
Transmission Solenoid And Pressure Switch Assembly - Installation3 steps
ℹ NOTE
If the Solenoid/Pressure Switch assembly is being replaced, the Quick Learn Procedure must be performed.
Fig. 1
Fig. 1
Fig. 2
Fig. 2
Fig. 3
Fig. 3
Fig. 4
Fig. 4
  1. Install Solenoid/Pressure Switch Assembly (1)(Figure 1) and screen (3) to the separator and transfer plates.
  2. Install and tighten retaining screws (2) (Figure 2) to 5.5 Nm (50 in. lbs.) torque.
  3. Install valve body. Valve Body - Installation
Transmission Solenoid And Pressure Switch Assembly - Operationreference
Fig. 1
Fig. 1
OPERATION SOLENOIDS The solenoids receive electrical power from the Transmission Control Relay through a single wire. The TCM energizes or operates the solenoids individually by grounding the return wire of the solenoid needed. When a solenoid is energized, the solenoid valve shifts, and a fluid passage is opened or closed (vented or applied), depending on its default operating state. The result is an apply or release of a frictional element. The 2/4 and UD solenoids are normally applied, which allows fluid to pass through in their relaxed or "off" state. By design, this allows transmission limp-in (P,R,N,2) in the event of an electrical failure. The continuity of the solenoids and circuits are periodically tested. Each solenoid is turned on or off depending on its current state. An inductive spike should be detected by the TCM during this test. If no spike is detected, the circuit is tested again to verify the failure. In addition to the periodic testing, the solenoid circuits are tested if a speed ratio or pressure switch error occurs. PRESSURE SWITCHES The TCM relies on three pressure switches to monitor fluid pressure in the L/R, 2/4, and OD hydraulic circuits. The primary purpose of these switches is to help the TCM detect when clutch circuit hydraulic failures occur. The range for the pressure switch closing and opening points is 11-23 psi. Typically the switch opening point will be approximately one psi lower than the closing point. For example, a switch may close at 18 psi and open at 17 psi. The switches are continuously monitored by the TCM for the correct states (open or closed) in each gear as shown in the following chart: PRESSURE SWITCH STATES A Diagnostic Trouble Code (DTC) will set if the TCM senses any switch open or closed at the wrong time in a given gear. The TCM also tests the 2/4 and OD pressure switches when they are normally off (OD and 2/4 are tested in 1st gear, OD in 2nd gear, and 2/4 in 3rd gear). The test simply verifies that they are operational, by looking for a closed state when the corresponding element is applied. Immediately after a shift into 1st, 2nd, or 3rd gear with the engine speed above 1000 rpm, the TCM momentarily turns on element pressure to the 2/4 and/or OD clutch circuits to identify that the appropriate switch has closed. If it doesn't close, it is tested again. If the switch fails to close the second time, the appropriate Diagnostic Trouble Code (DTC) will set.
Variable Line Pressure Sensor - Descriptionreference
Fig. 1
Fig. 1
Fig. 2
Fig. 2
DESCRIPTION The line pressure sensor (2)(Figure 1) is mounted on the top of the valve body, next to the pressure control solenoid (1). The TCM utilizes a closed-loop system to control transmission line pressure. The system contains a variable force style solenoid, the Pressure Control Solenoid. The solenoid is duty cycle controlled by the TCM to vent the unnecessary line pressure supplied by the oil pump back to the sump. The system also contains a variable pressure style sensor, the Line Pressure Sensor, which is a direct input to the TCM. The line pressure solenoid monitors the transmission line pressure and completes the feedback loop to the TCM. The TCM uses this information to adjust its control of the pressure control solenoid to achieve the desired line pressure.
Transmission Solenoid And Pressure Switch Assembly - Descriptionreference
Fig. 1
Fig. 1
Fig. 2
Fig. 2
DESCRIPTION The Solenoid/Pressure Switch Assembly (1)(Figure 1) is inside the transmission and mounted to the valve body assembly. The assembly consists of four solenoids that control hydraulic pressure to the L/R, 2/4, OD, and UD friction elements (transmission clutches), and the torque converter clutch. The reverse clutch is controlled by line pressure from the manual valve in the valve body. The solenoids are contained within the Solenoid/Pressure Switch Assembly, and can only be serviced by replacing the assembly. The solenoid assembly also contains pressure switches that monitor and send hydraulic circuit information to the TCM. Likewise, the pressure switches can only be service by replacing the assembly.
Variable Line Pressure Sensor - Removal4 steps
Fig. 1
Fig. 1
Fig. 2
Fig. 2
  1. Remove the valve body from the transmission. Valve Body - Removal
  2. Remove the electrical connectors from the pressure control solenoid (1)(Figure 1) and the line pressure sensor (2).
  3. Remove the screws (6) holding the pressure control solenoid (1) and line pressure sensor (2) to the valve body.
  4. Remove the pressure control solenoid and line pressure sensor from the valve body.
Variable Line Pressure Sensor - Installation4 steps
Fig. 1
Fig. 1
Fig. 2
Fig. 2
  1. Install the pressure control solenoid (1)(Figure 1) and line pressure sensor (2) into the valve body.
  2. Install the screws (6) to hold the pressure control solenoid (1) and line pressure sensor (2) to the valve body.
  3. Install the electrical connectors to the pressure control solenoid (1) and the line pressure sensor (2).
  4. Install the valve body into the transmission. Valve Body - Installation
Transmission Solenoid And Pressure Switch Assembly - Removal4 steps
ℹ NOTE
If the Solenoid/Pressure Switch Assembly is being replaced, the Quick Learn Procedure must be performed.
Fig. 1
Fig. 1
Fig. 2
Fig. 2
Fig. 3
Fig. 3
Fig. 4
Fig. 4
  1. Raise vehicle on hoist.
  2. Remove valve body assembly from transmission. Valve Body - Removal
  3. Remove Solenoid/Pressure Switch Assembly retaining screws (2) from solenoid(Figure 1).
  4. Remove Solenoid/Pressure Switch Assembly (1) and screen from valve body (2)(Figure 2).
Transmission Solenoid And Pressure Switch Assembly - Installation3 steps
ℹ NOTE
If the Solenoid/Pressure Switch assembly is being replaced, the Quick Learn Procedure must be performed.
Fig. 1
Fig. 1
Fig. 2
Fig. 2
Fig. 3
Fig. 3
Fig. 4
Fig. 4
  1. Install Solenoid/Pressure Switch Assembly (1)(Figure 1) and screen (3) to the separator and transfer plates.
  2. Install and tighten retaining screws (2) (Figure 2) to 5.5 Nm (50 in. lbs.) torque.
  3. Install valve body. Valve Body - Installation
Transmission Solenoid And Pressure Switch Assembly - Operationreference
Fig. 1
Fig. 1
OPERATION SOLENOIDS The solenoids receive electrical power from the Transmission Control Relay through a single wire. The TCM energizes or operates the solenoids individually by grounding the return wire of the solenoid needed. When a solenoid is energized, the solenoid valve shifts, and a fluid passage is opened or closed (vented or applied), depending on its default operating state. The result is an apply or release of a frictional element. The 2/4 and UD solenoids are normally applied, which allows fluid to pass through in their relaxed or "off" state. By design, this allows transmission limp-in (P,R,N,2) in the event of an electrical failure. The continuity of the solenoids and circuits are periodically tested. Each solenoid is turned on or off depending on its current state. An inductive spike should be detected by the TCM during this test. If no spike is detected, the circuit is tested again to verify the failure. In addition to the periodic testing, the solenoid circuits are tested if a speed ratio or pressure switch error occurs. PRESSURE SWITCHES The TCM relies on three pressure switches to monitor fluid pressure in the L/R, 2/4, and OD hydraulic circuits. The primary purpose of these switches is to help the TCM detect when clutch circuit hydraulic failures occur. The range for the pressure switch closing and opening points is 11-23 psi. Typically the switch opening point will be approximately one psi lower than the closing point. For example, a switch may close at 18 psi and open at 17 psi. The switches are continuously monitored by the TCM for the correct states (open or closed) in each gear as shown in the following chart: PRESSURE SWITCH STATES A Diagnostic Trouble Code (DTC) will set if the TCM senses any switch open or closed at the wrong time in a given gear. The TCM also tests the 2/4 and OD pressure switches when they are normally off (OD and 2/4 are tested in 1st gear, OD in 2nd gear, and 2/4 in 3rd gear). The test simply verifies that they are operational, by looking for a closed state when the corresponding element is applied. Immediately after a shift into 1st, 2nd, or 3rd gear with the engine speed above 1000 rpm, the TCM momentarily turns on element pressure to the 2/4 and/or OD clutch circuits to identify that the appropriate switch has closed. If it doesn't close, it is tested again. If the switch fails to close the second time, the appropriate Diagnostic Trouble Code (DTC) will set.
Variable Line Pressure Sensor - Descriptionreference
Fig. 1
Fig. 1
Fig. 2
Fig. 2
DESCRIPTION The line pressure sensor (2)(Figure 1) is mounted on the top of the valve body, next to the pressure control solenoid (1). The TCM utilizes a closed-loop system to control transmission line pressure. The system contains a variable force style solenoid, the Pressure Control Solenoid. The solenoid is duty cycle controlled by the TCM to vent the unnecessary line pressure supplied by the oil pump back to the sump. The system also contains a variable pressure style sensor, the Line Pressure Sensor, which is a direct input to the TCM. The line pressure solenoid monitors the transmission line pressure and completes the feedback loop to the TCM. The TCM uses this information to adjust its control of the pressure control solenoid to achieve the desired line pressure.
Transmission Solenoid And Pressure Switch Assembly - Descriptionreference
Fig. 1
Fig. 1
Fig. 2
Fig. 2
DESCRIPTION The Solenoid/Pressure Switch Assembly (1)(Figure 1) is inside the transmission and mounted to the valve body assembly. The assembly consists of four solenoids that control hydraulic pressure to the L/R, 2/4, OD, and UD friction elements (transmission clutches), and the torque converter clutch. The reverse clutch is controlled by line pressure from the manual valve in the valve body. The solenoids are contained within the Solenoid/Pressure Switch Assembly, and can only be serviced by replacing the assembly. The solenoid assembly also contains pressure switches that monitor and send hydraulic circuit information to the TCM. Likewise, the pressure switches can only be service by replacing the assembly.
Variable Line Pressure Sensor - Removal4 steps
Fig. 1
Fig. 1
Fig. 2
Fig. 2
  1. Remove the valve body from the transmission. Valve Body - Removal
  2. Remove the electrical connectors from the pressure control solenoid (1)(Figure 1) and the line pressure sensor (2).
  3. Remove the screws (6) holding the pressure control solenoid (1) and line pressure sensor (2) to the valve body.
  4. Remove the pressure control solenoid and line pressure sensor from the valve body.
Variable Line Pressure Sensor - Installation4 steps
Fig. 1
Fig. 1
Fig. 2
Fig. 2
  1. Install the pressure control solenoid (1)(Figure 1) and line pressure sensor (2) into the valve body.
  2. Install the screws (6) to hold the pressure control solenoid (1) and line pressure sensor (2) to the valve body.
  3. Install the electrical connectors to the pressure control solenoid (1) and the line pressure sensor (2).
  4. Install the valve body into the transmission. Valve Body - Installation
Transmission Solenoid And Pressure Switch Assembly - Removal4 steps
ℹ NOTE
If the Solenoid/Pressure Switch Assembly is being replaced, the Quick Learn Procedure must be performed.
Fig. 1
Fig. 1
Fig. 2
Fig. 2
Fig. 3
Fig. 3
Fig. 4
Fig. 4
  1. Raise vehicle on hoist.
  2. Remove valve body assembly from transmission. Valve Body - Removal
  3. Remove Solenoid/Pressure Switch Assembly retaining screws (2) from solenoid(Figure 1).
  4. Remove Solenoid/Pressure Switch Assembly (1) and screen from valve body (2)(Figure 2).
Transmission Solenoid And Pressure Switch Assembly - Installation3 steps
ℹ NOTE
If the Solenoid/Pressure Switch assembly is being replaced, the Quick Learn Procedure must be performed.
Fig. 1
Fig. 1
Fig. 2
Fig. 2
Fig. 3
Fig. 3
Fig. 4
Fig. 4
  1. Install Solenoid/Pressure Switch Assembly (1)(Figure 1) and screen (3) to the separator and transfer plates.
  2. Install and tighten retaining screws (2) (Figure 2) to 5.5 Nm (50 in. lbs.) torque.
  3. Install valve body. Valve Body - Installation
Transmission Solenoid And Pressure Switch Assembly - Operationreference
Fig. 1
Fig. 1
OPERATION SOLENOIDS The solenoids receive electrical power from the Transmission Control Relay through a single wire. The TCM energizes or operates the solenoids individually by grounding the return wire of the solenoid needed. When a solenoid is energized, the solenoid valve shifts, and a fluid passage is opened or closed (vented or applied), depending on its default operating state. The result is an apply or release of a frictional element. The 2/4 and UD solenoids are normally applied, which allows fluid to pass through in their relaxed or "off" state. By design, this allows transmission limp-in (P,R,N,2) in the event of an electrical failure. The continuity of the solenoids and circuits are periodically tested. Each solenoid is turned on or off depending on its current state. An inductive spike should be detected by the TCM during this test. If no spike is detected, the circuit is tested again to verify the failure. In addition to the periodic testing, the solenoid circuits are tested if a speed ratio or pressure switch error occurs. PRESSURE SWITCHES The TCM relies on three pressure switches to monitor fluid pressure in the L/R, 2/4, and OD hydraulic circuits. The primary purpose of these switches is to help the TCM detect when clutch circuit hydraulic failures occur. The range for the pressure switch closing and opening points is 11-23 psi. Typically the switch opening point will be approximately one psi lower than the closing point. For example, a switch may close at 18 psi and open at 17 psi. The switches are continuously monitored by the TCM for the correct states (open or closed) in each gear as shown in the following chart: PRESSURE SWITCH STATES A Diagnostic Trouble Code (DTC) will set if the TCM senses any switch open or closed at the wrong time in a given gear. The TCM also tests the 2/4 and OD pressure switches when they are normally off (OD and 2/4 are tested in 1st gear, OD in 2nd gear, and 2/4 in 3rd gear). The test simply verifies that they are operational, by looking for a closed state when the corresponding element is applied. Immediately after a shift into 1st, 2nd, or 3rd gear with the engine speed above 1000 rpm, the TCM momentarily turns on element pressure to the 2/4 and/or OD clutch circuits to identify that the appropriate switch has closed. If it doesn't close, it is tested again. If the switch fails to close the second time, the appropriate Diagnostic Trouble Code (DTC) will set.
Variable Line Pressure Sensor - Descriptionreference
Fig. 1
Fig. 1
Fig. 2
Fig. 2
DESCRIPTION The line pressure sensor (2)(Figure 1) is mounted on the top of the valve body, next to the pressure control solenoid (1). The TCM utilizes a closed-loop system to control transmission line pressure. The system contains a variable force style solenoid, the Pressure Control Solenoid. The solenoid is duty cycle controlled by the TCM to vent the unnecessary line pressure supplied by the oil pump back to the sump. The system also contains a variable pressure style sensor, the Line Pressure Sensor, which is a direct input to the TCM. The line pressure solenoid monitors the transmission line pressure and completes the feedback loop to the TCM. The TCM uses this information to adjust its control of the pressure control solenoid to achieve the desired line pressure.
Transmission Solenoid And Pressure Switch Assembly - Descriptionreference
Fig. 1
Fig. 1
Fig. 2
Fig. 2
DESCRIPTION The Solenoid/Pressure Switch Assembly (1)(Figure 1) is inside the transmission and mounted to the valve body assembly. The assembly consists of four solenoids that control hydraulic pressure to the L/R, 2/4, OD, and UD friction elements (transmission clutches), and the torque converter clutch. The reverse clutch is controlled by line pressure from the manual valve in the valve body. The solenoids are contained within the Solenoid/Pressure Switch Assembly, and can only be serviced by replacing the assembly. The solenoid assembly also contains pressure switches that monitor and send hydraulic circuit information to the TCM. Likewise, the pressure switches can only be service by replacing the assembly.