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
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ignition 1 Voltage | P2534 | P2534 | -- | P0562, P0563 |
Ignition 0 Voltage | -- | -- | -- | P0562, P0563 |
Battery Positive Voltage | -- | -- | -- | P0562, P0563 |
Typical Scan Tool Data
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine running in Park, normal operating temperature Parameter Normal Range: 12.5-14.5 volts | |||
Ignition Voltage | 0 volts | 0 volts | 12.5-14.5 volts |
Circuit/System Description
The transmission control module (TCM) continuously monitors the system voltage on the ignition voltage and the battery voltage circuits. Lower than normal or higher than normal voltage may be inadequate to operate the transmission control solenoids properly. Improper solenoid operation may cause erratic transmission operation and tie-up conditions, which may result in internal damage.
Conditions for Running the DTC
P0562
The engine speed is 1,200 RPM or greater for 5 seconds.
P0563
The ignition is ON.
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.
Action Taken When the DTC Sets
DTCs P0562 and P0563 are type C DTCs.
Conditions for Clearing the DTC
DTCs P0562 and P0563 are type C DTCs.
Diagnostic Aids
| • | Observe the driver information center (DIC) messaging that would indicate the electrical system requires service. |
| • | Inspect for loose or damaged terminals at the generator. |
| • | Inspect for loose or worn generator drive belt. |
| • | Use the scan tool in order to inspect all other modules for voltage related DTCs. |
| • | Running the engine with a battery charger attached may cause DTC P0563 to set. |
| • | Inspect the charging circuit for high resistance. |
| • | Inspect the vehicle battery for open or sulfated cells. |
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Start the engine in PARK and observe the Ignition Voltage parameter on the scan tool. The Ignition Voltage should be between 12-14.5 volts.
Circuit/System Testing
- Start the engine and observe the Ignition Voltage parameter with a scan tool. The Ignition Voltage parameter should be between 12-14.5 volts.
- Increase the engine speed to 1,500 RPM. The Ignition Voltage parameter should remain between 12-14.5 volts.
- Turn OFF the ignition. Disconnect the TCM connector. Probe the battery positive voltage and the ignition 1 voltage circuits of the TCM connector with the ground probe of the DMM. Connect the positive lead of the DMM to the battery positive terminal. Turn ON the ignition, with the engine OFF. Measure the voltage drop for each circuit. The voltage drop should be less than 0.5 volts.
- Turn OFF the ignition. Using the positive probe of the DMM, probe the ground circuits of the TCM connector. Connect the negative lead of the DMM to the battery ground terminal. Observe and record the voltage measurements. The voltage drop should be less than 0.2 volts.
| ⇒ | If the voltage is not within the specified range, refer to Charging System Test . |
| ⇒ | If the voltage is not within the specified range when the engine speed is increased, refer to Charging System Test . |
| ⇒ | If the voltage drop is greater than 0.5 volts, repair the high resistance in the affected circuit. |
| ⇒ | If the voltage drop is greater than 0.2 volts, repair the open or high resistance in the affected circuit. |
| ⇒ | If all circuits and connections test normal, replace the TCM. |
Component Testing
Start the engine and raise the engine speed to 1,500 RPM. Observe the Ignition Voltage parameter on the scan tool. The Ignition Voltage should be between 12-14.5 volts.
| ⇒ | If the voltage is not within the specified range, perform the Charging System Test . |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
| • | Ensure the battery voltage is between 12-14.5 volts. |
| • | Control Module References for TCM replacement, setup, and programming. |
