2010 Cadillac Truck SRX FWD V6-3.0L Page 2119
Static Test
1. Ignition OFF, remove the K71 Transmission Control Module.
2. Test for 5-5.6 ohm at 20掳C (68掳F) between the low reference circuit terminal 16 X2 and the voltage supply circuit terminal 21 X2.
瀚慖f less than the specified range, test the wiring harness for internal short. If the circuit test normal, replace the Q27E Pressure Control
Solenoid Valve 5.
3. Test for infinite resistance between each terminal and the low reference circuit terminal 16 X2 and also to the voltage supply circuit terminal
21 X2.
瀚慖f less than the specified range, replace the wiring harness.
4. If all circuit test normal, perform the Control Solenoid Valve Inspection (M36 and MXE) (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/AF40-6 - Automatic Transmission).
瀚慖f the inspection tests normal, replace the control valve body.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Control valve body replacement-Refer to Control Valve Body Replacement (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Valve Body/Service and Repair/AF40-6 - Automatic Transmission/Control Valve Body Replacement).
* TCM-Refer to Control Module References (See: Testing and Inspection/Programming and Relearning).
* Wiring harness-Refer to Automatic Transmission Wiring Harness Replacement (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Wiring Harness/Service and Repair).
6T70/6T75 - Automatic Transmission
DTC P2728-P2730
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P2728
- Clutch Pressure Control (PC) Solenoid 5 System Performance
DTC P2729
- Clutch Pressure Control (PC) Solenoid 5 Control Circuit Low Voltage
DTC P2730
- Clutch Pressure Control (PC) Solenoid 5 Control Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The clutch pressure control (PC) solenoid 5 is part of the control solenoid valve assembly which has no serviceable components. The normally low
PC solenoid 5 regulates and directs oil pressure to the 1-2-3-4 clutch regulator valve and 1-2-3-4 clutch boost valve. Increasing PC solenoid 5
pressure increases pressure to the 1-2-3-4 clutch. The TCM varies the current to the PC solenoid 5 through a low side driver. Increasing the current
to PC solenoid 5 increases oil pressure by closing OFF the solenoid exhaust port. Decreasing the current to PC solenoid 5 decreases oil pressure by
opening the exhaust port. PC solenoid 5 power is supplied by the TCM through a high side driver (HSD). The HSD protects the circuit and
components from excessive current flow. If excessive current flow is detected, the HSD will turn OFF. When the fault is corrected, the HSD will
reset.
Conditions for Running the DTC
