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P2728




DTC P2727-P2730

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P2727

-
Pressure Control (PC) Solenoid 1 Open

DTC P2728

-
Pressure Control (PC) Solenoid 1 System Performance

DTC P2729

-
Pressure Control (PC) Solenoid 1 Control Circuit Low Voltage

DTC P2730

-
Pressure Control (PC) Solenoid 1 Control Circuit High Voltage

Diagnostic Fault Information






Circuit/System Description

The pressure control (PC) solenoid valve 1 (PCS1) is a solenoid that controls pressure which is proportional to the current. The transmission fluid pressure from PCS1 is directed to another valve which regulates the transmission fluid flow and pressure through shift valves that allows it to engage different clutches.

The transmission control module (TCM) provides B+ to PCS1, the torque converter clutch (TCC) pressure control solenoid valve, and the modulated main pressure (PC) solenoid valve, through a separate solid state device called high side driver 1 (HSD1). The TCM uses a low side driver to control the current flow to the PCS1. The TCM controls the current to the solenoid by changing the amount of time that the low side driver is on.

Conditions for Running the DTC

P2727, P2729, or P2730

* DTC P0657, P0658, or P0659 is not set.

* Battery voltage is between 9-18 V.

* Engine speed is greater than 200 RPM for 4 seconds.

* HSD1 is commanded ON.

P2728

* DTC P0657, P0658, P0659, P2727, or P2729 is not set.

* Battery voltage is between 9-18 V.

* Engine speed is greater than 200 RPM for 4 seconds.

* HSD1 is commanded ON.

Conditions for Setting the DTC

P2727

The TCM detects an open circuit on the PCS1 control circuit for 1 second.

P2728

TCM detects the PCS1 current does not equal the commanded PCS1 current for 10 seconds.

P2729

The TCM detects a short to ground on the PCS1 control circuit for 1 second.

P2730

The TCM detects a short to voltage on the PCS1 circuit for 1 second.

Action Taken When the DTC Sets

* DTCs P2727, P2728, P2729, and P2730 are Type A DTCs.

* If the DTC sets while in a forward gear, the TCM commands 1st, 3rd, or 5th gear.

Conditions for Clearing the DTC

DTCs P2727, P2728, P2729, and P2730 are Type A DTCs.

Diagnostic Aids

P2727

* You may have to drive the vehicle in order to experience a condition.

* If DTC P2727 is accompanied by DTC P0960 and/or DTC P2761 the open is most likely in the HSD1 circuit.

P2729 and P2730

You may have to drive the vehicle in order to experience a condition.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics Electrical Diagrams

Connector End View Reference

* Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

* Inline Harness Connector End Views X100

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 Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. If DTC P0657 or P0658 was set, diagnose those DTCs first.

2. Ignition ON, engine OFF, command the PC Solenoid 1 ON and OFF with a scan tool. Observe the scan tool PC Sol. 1 Pressure Command parameter. The PC Sol. 1 Pressure Command parameter should change from 0 kPa (0 psi) to 1,600 kPa (232 psi).

• If the parameter does not change between the specified values

Refer to Circuit/System Testing below.

• If the parameter changes between the specified values

3. Clear the TCM DTCs.

4. Perform the Road Test Initial Inspection and Diagnostic Overview. Verify with a scan tool that DTC P2727, P2728, P2729 or P2730 did not set.

• If DTC P2727, P2728, P2729 or P2730 set

Refer to Circuit/System Testing below.

• If DTC P2727, P2728, P2729 or P2730 did not set

5. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections.

Circuit/System Testing

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

1. Ignition OFF, disconnect the 20-way X175 harness connector at the transmission.

2. Ignition ON, engine OFF

3. Verify that a test lamp illuminates between the vehicle harness X175 transmission connector B+ circuit terminal L and ground.

• If the test lamp does not illuminate

1. Ignition OFF, disconnect the 80 way vehicle harness connector at the K71 transmission control module.

2. Test for infinite resistance between the X175 vehicle harness transmission connector B+ circuit terminal L and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms between the X175 vehicle harness transmission connector B+ circuit terminal L and the vehicle harness transmission control module connector terminal 11.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K71 transmission control module.

• If the test lamp illuminates

4. Connect a test lamp between the X175 transmission connector pressure control (PC) solenoid valve 1 control circuit terminal M and the B+ circuit terminal L.

5. Command the PC Solenoid 1 ON and OFF with a scan tool and verify the PC Sol. 1 Pressure Command parameter changes from 1600 kPa (232 psi) to 0 kPa (0 psi). The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always ON

1. Ignition OFF, disconnect the 80 way vehicle harness connector at the K71 transmission control module.

2. Test for infinite resistance between the X175 vehicle harness transmission connector pressure control (PC) solenoid valve 1 control circuit terminal M and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the K71 transmission control module.

• If the test lamp is always OFF

1. Ignition OFF, disconnect the 80 way vehicle harness connector at the K71 transmission control module.

2. Test for less than 2 ohms between the X175 vehicle harness transmission connector pressure control (PC) solenoid valve 1 control circuit terminal M and the vehicle harness transmission control module connector terminal 55.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms

3. Ignition ON.

4. Test for less than 1 volt between the X175 vehicle harness connector pressure control (PC) solenoid valve 1 control circuit terminal M and ground.

• If 1 volt or greater, repair the short to voltage in the circuit.

• If less than 1 volt, replace the K71 transmission control module.

• If test lamp turns ON and OFF

6. Ignition OFF, install the X175 vehicle harness transmission connector.

7. Remove the transmission oil pan. Refer to Oil Pan Replacement Service and Repair.

8. Disconnect the pressure control (PC) solenoid valve 1 connector.

9. Connect a test lamp between the transmission internal harness pressure control (PC) solenoid valve 1 connector B+ circuit terminal 1 and control circuit terminal 2.

10. Ignition ON, engine OFF.

11. Command the PC Solenoid 1 ON and OFF with a scan tool and verify the PC Sol. 1 Pressure Command parameter changes from 1600 kPa (232 psi) to 0 kPa (0 psi). The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp does not turn ON and OFF

Replace the transmission internal wiring harness. Refer to Wiring Harness Replacement Service and Repair.

• If the test lamp turns ON and OFF

12. Ignition OFF, disconnect the 80 way vehicle harness connector at the K71 transmission control module.

13. Test for infinite resistance between the transmission internal harness pressure control (PC) solenoid valve 1 connector control circuit terminal 2 and ground.

• If less than infinite resistance

Repair the short to ground on the circuit.

• If infinite resistance

14. Test for less than 2 ohms between transmission internal harness pressure control (PC) solenoid valve 1 connector control circuit terminal 2 and the vehicle harness transmission control module connector terminal 55.

• If 2 ohms or greater

Repair the open/high resistance in the circuit.

• If less than 2 ohms

15. Replace the pressure control (PC) solenoid valve 1.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Wiring Harness Replacement Service and Repair

* Control Valve Solenoid Replacement (PCS1 and PCS2) Control Valve Solenoid Replacement (PCS1 and PCS2)Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD) Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD)

* Control Module References Control Module References for TCM replacement, programming, and setup.

Repair Verification

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

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