Pinpoint Test D: LPC (Line Pressure Control) PCA (Pressure Control Solenoid A) Solenoid

Pinpoint Tests

Refer to Wiring Diagrams Set 29 for schematic and connector information. Electrical Diagrams

PINPOINT TEST D : LPC (Line Pressure Control) PCA (Pressure Control Solenoid A) SOLENOID

NOTE: Refer to the Transaxle Vehicle Harness Connector illustration within the Transaxle Connector Layouts Transaxle Connector Layouts procedure.

NOTE: Read and record all DTCs.

D1 ELECTRONIC DIAGNOSTICS SET UP

- Make sure the transaxle harness connector is fully seated, terminals are fully engaged in the connector and in good condition before proceeding.

- Connect the scan tool.

- Ignition ON.

- Access the Pressure Control Solenoid A (PCA) solenoid PIDs.

Is communication with the PCM established?

Yes
GO to D2.

No
REPEAT procedure to access the PCA (Pressure Control Solenoid A) solenoid PIDs. If the scan tool cannot establish communication with the PCM, REFER to the Computers and Control Systems Information for diagnosis of PCM.

D2 SOLENOID FUNCTIONAL TEST

- Remove the line pressure tap plug.





- Install a 1/8 x 28-to-1/8 x 28 pipe thread adapter into the line pressure tap.





- Install the Hydraulic Pressure Gauge on the adapter.

- Select PCA.

- Increase engine speed above 1,500 rpm.

- Using the scan tool, command the line pressure to 50, 70, 90, 110, 130 or 150 psi while monitoring the pressure gauge.

- Once the test is complete, remove the 1/8 x 28-to-1/8 x 28 pipe thread adapter and install the line pressure tap plug.
- Tighten to 13 Nm (115 lb-in).


Does the pressure reading match the commanded pressure?

Yes
CLEAR DTCs. TEST the system for normal operation.

No
GO to D3.

D3 CHECK THE VEHICLE HARNESS FOR A SHORT TO POWER

- Ignition OFF.

- Disconnect: Transaxle Vehicle Harness C199.

- Disconnect: PCM C175T.

- Visually inspect all wires and connectors for damage.

- Ignition ON.

- Measure the voltage between transaxle vehicle harness C199-2, circuit 91S-TA17 (BK/RD) and ground.





- Measure the voltage between transaxle vehicle harness C199-7, circuit 8-TA36 (WH/GN) and ground.





Is any voltage present?

Yes
REPAIR the circuit for a short to power. TEST the system for normal operation.

No
GO to D4.

D4 CHECK THE VEHICLE HARNESS FOR A SHORT TO GROUND

- Measure the resistance between transaxle vehicle harness C199-2, circuit 91S-TA17 (BK/RD) and ground.





- Measure the resistance between transaxle vehicle harness C199-7, circuit 8-TA36 (WH/GN) and ground.





Is the resistance greater than 10,000 ohms?

Yes
GO to D5.

No
REPAIR the circuit(s) for a short to ground. TEST the system for normal operation.

D5 CHECK THE VEHICLE HARNESS FOR AN OPEN CIRCUIT

- Ignition OFF.

- Measure the resistance between transaxle vehicle harness C199-2, circuit 91S-TA17 (BK/RD) and PCM C175T-50, circuit 91S-TA17 (BK/RD).





- Measure the resistance between transaxle vehicle harness C199-7, circuit 8-TA36 (WH/GN) and PCM C175T-43, circuit 8-TA36 (WH/GN).





Is the resistance less than 5 ohms?

Yes
GO to D6.

No
REPAIR the circuit for an open. TEST the system for normal operation

D6 CHECK SOLENOID RESISTANCE

- Measure the resistance between transaxle C199-2, component side and ground.





- Measure the resistance between transaxle C199-7, component side and ground.





Is the resistance between 2.4 and 7.3 ohms?

Yes
INSTALL a new PCM.

No
GO to D7.

D7 CHECK THE TRANSAXLE INTERNAL WIRING HARNESS FOR A SHORT TO GROUND

- Remove the transmission fluid pan. Refer to Transmission Fluid Pan .

- Disconnect the Line Pressure Control (LPC) electrical connector.





- Measure the resistance between transaxle vehicle harness connector pin 2 (component side, transaxle internal harness) and ground.





- Measure the resistance between transaxle vehicle harness connector pin 7 (component side, transaxle internal harness) and ground.





Is the resistance greater than 10,000 ohms?

Yes
GO to D8.

No
INSTALL a new transaxle internal harness. TEST the system for normal operation.

D8 CHECK THE TRANSAXLE INTERNAL HARNESS FOR AN OPEN

- Measure the resistance between transaxle vehicle harness connector pin 2 (component side, transaxle internal harness) and transaxle internal harness connector pin 2.





- Measure the resistance between transaxle vehicle harness connector pin 7 (component side, transaxle internal harness) and transaxle internal harness connector pin 7.





Is the resistance less than 5 ohms?

Yes
INSTALL a new LPC (Line Pressure Control) solenoid. TEST the system for normal operation.

No
INSTALL a new transaxle internal harness. TEST the system for normal operation.