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P0701



DTC P0701

Diagnostic Instructions

* Perform theDiagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* ReviewStrategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



DTC Descriptor
DTC P0701
- Transmission Control System Performance




Typical Scan Tool Data






Circuit/System Description

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.

* Pressure switch 1 (PS1) monitors shift valve 1 positioning
* Pressure switch 2 (PS2) monitors shift valve 2 positioning
* Pressure switch 3 (PS3) monitors shift valve 3 positioning
* Pressure switch 4 (PS4) monitors the manual selector valve positioning


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


Conditions for Running the DTC

* The test is enabled after engine start-up and runs as part of the transmission hydraulic initialization.
* Test runs for 300 seconds following engine start-up.



Conditions for Setting the DTC


Condition 1:
* At start-up, all pressure switches do not indicate pressure.
* Engine speed is greater than 500 RPM for 6 seconds or 400 RPM for 15 seconds.
* Forward or REVERSE range is selected.



Condition 2:
* During low speed normal operation, pressure switches indicate loss of pressure.
* Engine running with engine speed less than 1000 RPM.
* Transmission turbine speed is less than 1000 RPM.
* Transmission output speed is less than 200 RPM.
* Forward or REVERSE range is selected.



Action Taken When the DTC Sets

* Range is inhibited, and the driver is required to use the gear selector to reselect the range.
* DTC P0701 is stored in TCM history.
* The TCM does not illuminate the malfunction indicator lamp (MIL).
* The TCM inhibits Torque Converter Clutch (TCC) operation.



Conditions for Clearing the DTC

DTC P0701 is a Type C DTC.


Diagnostic Aids

* A plugged control main filter may cause the DTC to set.
* A cracked internal suction filter tube or damaged tube seal may cause the DTC to set.
* A stuck lube regulator valve may cause the DTC to set.
* Must attempt to select range in order to experience a condition.
* May have to wait several hours prior to restarting vehicle to experience the condition.
* This DTC is most likely the result of no pressure and not wiring or the pressure switch module.



Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

* Transmission General Description (Transmission General Description)
* Transmission Component and System Description (Transmission Component and System Description)
* Electronic Component Description (Electronic Component Description)

Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information


Circuit/System Verification

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 (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.



Circuit/System Testing



Note

You must perform the Circuit/System Verification first.

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

• If line pressure is low in all ranges, refer toLow Main Line Pressure in All Ranges (Low Main Line Pressure In All Ranges) .
• If line pressure is low in a specific range or ranges, refer toLow Main Line Pressure in Specific Ranges, Normal Pressure in Other Ranges (Low Main Line Pressure in Specific Ranges, Normal Pressure in Other Ranges) .

3. Remove and Replace the control main filter, refer toAutomatic Transmission Fluid and Filter Replacement (Removal and 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 (Pressure Switch Manifold (PSM) Logic) .
5. Ignition OFF, remove the X175 harness connector at the transmission.

1. Ignition ON, engine OFF, connect a 3A fused jumper wire to the PS1 signal circuit terminal D to ground
2. PS2 signal circuit terminal F to ground
3. PS3 signal circuit terminal E to ground
4. PS4 signal circuit terminal K to ground
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 (Service and Repair) .
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 (Service and Repair) .
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.




Repair Instructions

Perform theDiagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Wiring Harness Replacement (Service and Repair)
* Pressure Switch Manifold Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for TCM replacement, setup, and programming



Repair Verification

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

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