The pressure switch manifold (PSM) is a multiple switch assembly made up of 3 normally open (N/O) pressure switches and 1 normally closed (N/C) pressure switch.

The pressure switches communicate the positioning to the transmission control module (TCM).

Condition 1:

Condition 2:

DTC P0701 is a Type C DTC.

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Engine running, command the transmission through the forward ranges with a scan tool. Compare the TFP Switch 1, TFP Switch 2, TFP Switch 3, and TFP Switch 4 parameters in each forward range with the Pressure Switch Manifold Logic table. Refer to Pressure Switch Manifold (PSM) Logic.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Note: You must perform the Circuit/System Verification first.

1. Inspect the transmission fluid level. Refer to Transmission Fluid Check.
2. Perform a line pressure test. Refer to Line Pressure Check.

⇒	If line pressure is low in all ranges, refer to Low Main Line Pressure in All Ranges.

⇒	If line pressure is low in a specific range or ranges, refer to Low Main Line Pressure in Specific Ranges, Normal Pressure in Other Ranges.

3. Remove and Replace the control main filter, refer to Automatic Transmission Fluid and Filter Replacement.
4. Engine running, command the transmission through the forward ranges with a scan tool. Compare the TFP Switch 1, TFP Switch 2, TFP Switch 3, and TFP Switch 4 parameters in each forward range with the Pressure Switch Manifold Logic table. Refer to Pressure Switch Manifold (PSM) Logic.
5. Ignition OFF, remove the X175 harness connector at the transmission.

5.1.	Ignition ON, engine OFF, connect a 3A fused jumper wire to the PS1 signal circuit terminal D to ground

5.2.	PS2 signal circuit terminal F to ground

5.3.	PS3 signal circuit terminal E to ground

5.4.	PS4 signal circuit terminal K to ground

5.5.	Verify with a scan tool the TFP Switch 1, TFP Switch 2, TFP Switch 3, and TFP Switch 4 parameters changed from High to Low when the signal circuit is grounded

⇒	If not the specified value, test affected pressure switch signal for an open/high resistance and short to ground. If circuits test normal, replace the TCM.

6. Ignition OFF, connect the X175 harness connector to the transmission.
7. Remove the transmission oil pan. Refer to Oil Pan Replacement.
8. Remove the pressure switch module from the valve body. Leave the internal wire harness connected to the pressure switch manifold. Refer to Pressure Switch Manifold Replacement.
9. Connect a jumper wire to the base of the pressure switch module and ground.
10. Ignition ON, engine OFF, gently push on PS1, PS2, PS3, and PS4 switches. Verify with a scan tool that the TFP Switch 1, TFP Switch 2, and TFP Switch 3 parameters changed from High to Low and TFP Switch 4 parameter changed from Low to High.

⇒	If not the specified value, test the internal wire harness circuits for an open/high resistance or short to ground. If the circuits test normal, replace the pressure switch module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

If another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.