P2720

P2720-PRESSURE CONTROL SOLENOID "D" CONTROL CIRCUIT LOW





For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The C3 Pressure Control Linear solenoid is used to control overall transmission line pressure. The Transmission Control Module (TCM) monitors the Solenoid current load and resistance. If a fault is detected, the transmission will go into limp in mode, the Torque Converter Clutch (TCC) will be disabled, and the MIL will be illuminated.

- When Monitored:
Ignition on, engine running.

System voltage is greater than 10.5 volts.

No solenoid short to voltage DTCs set.

- Set Condition:
C3 Pressure Control Linear solenoid current is less than 0.02 of an amps for more than 0.1 of a second for five consecutive tests.





Always perform the AW60T Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

1. CHECK IF THE DTC IS CURRENT
1. Using the scan tool, read TCM DTCs.
2. Record the Environmental Data and any DTCs.
3. Clear DTCs.
4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.

NOTE: It may be necessary to road test the vehicle to duplicate the original set conditions.

5. Read TCM DTCs.

Did the DTC reset?

Yes

- Go To 2

No

- Go To 4

2. CHECK THE C3 PRESSURE CONTROL LINEAR SOLENOID




1. Turn the ignition off to the lock position.
2. Disconnect TCM harness connector and remove the TCM from the transmission.
3. Measure the resistance of the C3 Pressure Control Linear solenoid between the appropriate terminals of the TCM transmission connector.

Is the resistance 6.1 Ohms (± 0.2 of an Ohm)?

Yes

- Go To 3

No

- Replace the C3 Pressure Control Linear solenoid.
- Perform the AW60T VERIFICATION TEST. AW60T Transmission Verification Test.

3. CHECK THE C3 PRESSURE CONTROL LINEAR SOLENOID FOR A SHORT TO GROUND




1. Measure the resistance of the C3 Pressure Control Linear solenoid between ground the appropriate terminals of the TCM transmission connector.

Is the resistance below 100k Ohms?

Yes

- Remove the Transmission Side cover and inspect the internal harness for short to ground. Service and Repair. If no short is found, replace the C3 Pressure Control Linear solenoid.
- Perform the AW60T VERIFICATION TEST. AW60T Transmission Verification Test.

No

- Using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM. AW60T TCM Programming Procedure.
- Perform the AW60T VERIFICATION TEST. AW60T Transmission Verification Test.

4. CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Use the Freeze Frame Data to help duplicate the conditions in which the DTC originally set. Pay particular attention to the DTC set conditions, such as, VSS, MAP, ECT, and Load
3. Using the schematics as a guide, visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
4. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
5. Wiggle the wiring and connectors while checking for any possible open or shorted circuits.
6. Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the AW60T VERIFICATION TEST. AW60T Transmission Verification Test.

No

- Test Complete.