Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0562: System Voltage LowDTC P0563: System Voltage High
DTC P2534: Ignition 1 Switch Circuit Low Voltage
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
IGN | P0562, P2534 | P0562, P2534 | P0563 | -- |
Ground | -- | P0562, P2534 | -- | -- |
Circuit/System Description
The transmission control module (TCM) within the control solenoid (w/body and TCM) valve assembly continuously monitors the system voltage on the ignition voltage circuit.
Conditions for Running the DTC
P0562
| • | Ignition voltage is between 8.6 volts and 19.0 volts. |
| • | Engine speed is 1200 RPM or greater. |
P0563
Ignition voltage is between 8.6 volts and 19.0 volts.
P2534
| • | The engine is running. |
| • | Ignition voltage is between 8.6 volts and 19.0 volts. |
Conditions for Setting the DTC
P0562
The TCM detects system voltage is 11 volts or less for 10 seconds.
P0563
The TCM detects system voltage is 18 volts or greater for 10 seconds.
P2534
The TCM detects 2 volts or less on the ignition 1 voltage circuit at the TCM for 10 seconds or more.
Action Taken When the DTC Sets
P0562 and P0563
DTCs P0562 and P0563 are Type C DTCs.
P2534
| • | DTC P2534 is a Type A DTC. |
| • | The TCM turns OFF all high side drivers. |
| • | The TCM turns OFF all solenoids. |
| • | The TCM commands maximum line pressure. |
| • | The TCM freezes transmission adaptive functions. |
| • | The TCM commands the TCC OFF. |
| • | The TCM allows the vehicle to operate in transmission protection mode. |
Conditions for Clearing the DTC
| • | DTCs P0562 and P0563 are Type C DTCs. |
| • | DTC P2534 is a Type A DTC. |
Diagnostic Aids
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
Connector End View Reference
Description and Operation
Transmission General Description
Electrical Information Reference
| • | Circuit Testing |
| • | Wiring Repairs |
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
DT-47825-20 Adapter Harness
Circuit/System Verification
- Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6-15.0 volts.
- Observe the scan tool TCM Ignition Voltage parameter. The reading should be between 12.6-15.0 volts.
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
| ⇒ | If not within the specified range, refer to Charging System Test. |
Circuit/System Testing
- Ignition OFF, disconnect the 20-way harness connector at the transmission.
- Connect the DT-47825-20 to the 20-way transmission harness connector.
- Test for less than 10 ohms between the ground circuit terminals listed below and ground.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminals listed below and ground.
- If all circuits test normal, replace the control solenoid (w/body and TCM) valve assembly.
| • | Terminal 1 |
| • | Terminal 18 |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| • | Terminal 13 |
| • | Terminal 15 |
| ⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. |
Repair Instructions
Important:
| • | Perform the Service Fast Learn Adapts following all transmission related repairs. |
| • | Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming
