6T30/6T40/6T45/6T50 - Automatic Transmission
DTC P2534
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 P2534
-
Ignition On/Start Switch Circuit Low Voltage
Diagnostic Fault Information
Circuit/System Description
The transmission control module (TCM) continuously monitors the system voltage on the TCM Ignition voltage circuit. Lower than normal voltage may be inadequate to operate the transmission control solenoids properly. Improper solenoid operation may cause erratic transmission operation, which may result in internal damage.
Conditions for Running the DTC
Engine control module (ECM) communicates that the engine is running through the controller area network (CAN).
Conditions for Setting the DTC
TCM detects between 2.0-5.0 volts on the ignition voltage circuit at the TCM for 7 seconds.
Action Taken When the DTC Sets
* DTC P2534 is a Type A DTC.
* TCM turns the high side driver OFF.
* TCM turns OFF all solenoids.
* TCM commands maximum line pressure.
* TCM freezes transmission adaptive functions.
* TCM commands the torque converter clutch (TCC) OFF.
* TCM limits the transmission to reverse and 5th gear.
* TCM inhibits neutral idle.
* TCM inhibits the Tap Up/Tap Down function.
* TCM inhibits manual shifting of forward gears.
* TCM enables torque management.
Conditions for Clearing the DTC
DTC P2534 is a Type A DTC.
Diagnostic Aids
* Observe the driver information center (DIC) messaging that would indicate the electrical system requires service.
* Inspect for the following conditions:
- Loose or damaged terminals at the generator
- Loose or worn generator drive belt
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics 6T30/6T40/6T45/6T50 - Automatic Transmission
Connector End View Reference
* Component Connector End Views Connector End Views By Name
* Inline Harness Connector End Views Connector End Views By Number
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 Programming and Relearning for scan tool information
Special Tools
DT-48616-10 - Adapter Harness
For equivalent regional tools, refer to Special Tools 6T30/6T40/6T45/6T50 - Automatic Transmission.
Circuit/System Verification
1. Engine ON, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6-15.0 volts.
• If not between 12.6-15.0 volts
Refer to Charging System Test Initial Inspection and Diagnostic Overview.
• If between 12.6-15.0 volts
2. Observe the scan tool TCM Ignition Voltage parameter. The reading should be between 12.6-15.0 volts.
• If not between 12.6-15.0 volts
Refer to Circuit/System Testing below.
• If between 12.6-15.0 volts
3. 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
1. Ignition OFF, and all vehicle systems OFF, disconnect the X1 14-way harness connector at the transmission.
2. Connect the DT-48616-10 - harness to the vehicle wire harness X1 14-way transmission connector.
3. Test for less than 5 ohms between the ground circuit terminal 2 and ground.
• If 5 ohms or greater
Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 5 ohms
4. Ignition ON.
5. Verify a test lamp illuminates between terminal 12 and ground at the transmission case.
• If the test lamp does not illuminate and the circuit fuse is good
1. Ignition OFF.
2. Test for less than 2 ohms in the ignition circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF.
2. Test the ignition circuit for a short to ground.
• If ignition circuit is shorted to ground, repair the short to ground in the circuit.
• If ignition circuit is not shorted to ground, replace the fuse.
• If the test lamp illuminates
6. Replace the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement Service and Repair.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
Note:
Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.
* Refer to Control Module References Programming and Relearning for control solenoid valve assembly replacement, programming and setup.
* Perform the Transmission Adaptive Values Learn Programming and Relearning following all transmission related repairs.