Pinpoint Test D: EPC Solenoid

4R70E/4R75E

Pinpoint Tests

PINPOINT TEST D: EPC SOLENOID

NOTE: Refer to the Transmission Internal Harness Connector illustration in Transmission Connector Layouts Transmission Connector Layouts.

NOTE: Read and record all DTCs.

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D1 ELECTRONIC DIAGNOSTICS


- Select PARK.
- Ignition OFF.
- Check to make sure the transmission vehicle harness C1274 is fully seated, pins are fully engaged in the connector and are in good condition before proceeding.
- Connect the scan tool.
- Ignition ON.
- Access the transmission PIDs.
- Is the scan tool able to access the transmission PIDs?

Yes
GO to D2.

No
REPEAT procedure to access the transmission PIDs. If the scan tool did not access the transmission PIDs, REFER to Computers and Control Systems Information for diagnosis of PCM.

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D2 SOLENOID FUNCTIONAL TEST


- Install the Transmission Fluid Pressure Gauge into the line pressure tap.
- Monitor the Transmission Fluid Pressure Gauge.
- With the engine running above 1,200 rpm, command the LINEDSD# PID to change the line pressure.
- Does the pressure reading change when commanded?

Yes
CLEAR the DTCs. TEST the system for normal operation.

No
GO to D3.

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D3 CHECK FOR BATTERY VOLTAGE


- Ignition OFF.
- Disconnect: Transmission Vehicle Harness C1274 .
- Ignition ON.
- Measure the voltage between the transmission vehicle harness C1274-1, circuit 391 (RD/YE), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to D4.

No
REPAIR the vehicle harness circuit 391 (RD/YE). CLEAR the DTCs. TEST the system for normal operation.

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D4 CHECK VEHICLE HARNESS SIGNAL CIRCUIT FOR AN OPEN


- Ignition OFF.
- Disconnect: PCM C175T.
- Measure the resistance between the transmission vehicle harness C1274-7 and PCM C175T-11, circuit 925 (WH/YE), harness side.




- Is the resistance less than 5 ohms?

Yes
GO to D5.

No
REPAIR the vehicle harness circuit 925 (WH/YE) for an open. CLEAR the DTCs. TEST the system for normal operation.

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D5 CHECK VEHICLE HARNESS SIGNAL CIRCUIT FOR SHORT TO GROUND


- Measure the resistance between transmission vehicle harness C1274-7, 925 (WH/YE), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to D6.

No
REPAIR the vehicle harness circuit 925 (WH/YE) for a short to ground. CLEAR the DTCs. TEST the system for normal operation.

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D6 CHECK TRANSMISSION INTERNAL HARNESS FOR A SHORT TO GROUND


- Measure the resistance between the transmission internal harness C1274-7, component side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to D7.

No
REPAIR the transmission internal harness circuit for a short to ground. CLEAR the DTCs. TEST the system for normal operation.

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D7 CHECK THE TRANSMISSION INTERNAL HARNESS/COMPONENT FOR AN OPEN


- Measure the resistance between the transmission internal harness C1274-1, and C1274-7, component side.




- Is the resistance within 2.48 to 5.66 ohms?

Yes
REPLACE the PCM. TEST the system for normal operation.

No
INSPECT the transmission internal harness for an open. If no open is found, REPLACE the EPC solenoid. CLEAR the DTCs. TEST the system for normal operation.

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