For 1990-2009 cars

### 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 Low
DTC P0563: System Voltage High

### Diagnostic Fault Information

Circuit | Short to Ground | High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Battery Voltage | P2534 | P0562, P2534 | -- | P0562, P2534
Ground | -- | P0562, P2534 | -- | P0722, P0723

### Circuit/System Description

The transmission control module (TCM) within the control solenoid (with body and TCM) valve assembly continuously monitors the system voltage on the Ignition 1 voltage circuits.

### Conditions for Running the DTC

#### P0562

• | Ignition voltage is between 9.0 volts and 18.0 volts.

• | Engine speed is 1200 RPM or greater.

#### P0563

Ignition voltage is between 9.0 volts and 18.0 volts.

### Conditions for Setting the DTC

#### P0562

The TCM detects system voltage is 11 volts or less for 4 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 the following conditions:

- | Loose or damaged terminals at the generator

- | Loose or worn generator drive belt

• | Running the engine with a battery charger attached may cause DTC P0563 to set.

### Reference Information

#### Schematic Reference

Automatic Transmission Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Charging System Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | 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-48616-10 Adapter Harness

### Circuit/System Verification

1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6-15.0 volts.

⇒ | If not within the specified range, refer to Charging System Test.

2. Observe the scan tool TCM Ignition Voltage parameter. The reading should be between 12.6-15.0 volts.
3. 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.

### Circuit/System Testing

1. Ignition OFF, disconnect the 14-way harness connector at the transmission.
2. Connect the DT-48616-10 harness to the 14-way transmission harness connector.
3. Test for less than 10 ohms between the ground circuit terminal 2 and ground.

⇒ | If greater than the specified range, test the ground circuit for an open/high resistance.

4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminals listed below and ground.

• | Terminal 1

• | Terminal 12

• | Terminal 13

⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

5. If all circuits test normal, replace the control solenoid (with body and TCM) valve assembly.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection.

• | Refer to Control Module References for control solenoid (with body and TCM) valve assembly replacement, setup, and programming.

• | Perform the Service Fast Learn Adapts following all transmission related repairs.