DTC P1574 ECM w/L61
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 Descriptor
DTC P1574 : Stop Lamp Switch CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open or High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Stop Lamp Switch Signal | P1574 | P1574 | P1574 | -- |
Circuit/System Description
The stoplamp switch is used to sense the action of the driver application of the brake pedal. The stoplamp switch will apply battery voltage to the park/stoplamp signal voltage supply circuit to illuminate the stop lamps and the center high mounted stop lamp (CHMSL). The stoplamp switch also sends a signal to the engine control module (ECM) as well to indicate the application of the brake pedal.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | Battery voltage is greater than 11.5 volts. |
Conditions for Setting the DTC
The ECM detects a short to ground, short to voltage, or open on the stop lamp switch signal circuit when the brakes are applied.
Action Taken When the DTC Sets
| • | The ECM stores the DTC to memory. |
| • | The ECM will record the operating conditions at the time the diagnostic failed. The ECM stores this information in Failure Records. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | You issue a scan tool CLEAR DTCs command. |
| • | A history DTC will clear once 40 malfunction-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Lighting Systems Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Perform the stoplamp switch adjustment, refer to Stop Lamp Switch Adjustment , clear all DTCs, and operate the vehicle within the Conditions for Running the DTC.
- If circuits test OK, replace the ECM.
| ⇒ | If DTC P1574 resets as current, test the stop lamp switch signal circuit for a short to ground, short to voltage, or open. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
DTC P1574 PCM w/L66
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 Descriptor
DTC P1574 : Stop Lamp Switch CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open or High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Stop Lamp Switch Signal | P1574 | P1574 | P1574 | -- |
Circuit/System Description
The stoplamp switch is used to sense the action of the driver application of the brake pedal. The stoplamp switch will apply battery voltage to the park/stoplamp signal voltage supply circuit to illuminate the stop lamps and the center high mounted stop lamp (CHMSL). The stoplamp switch also sends a signal to the powertrain control module (PCM) as well to indicate the application of the brake pedal.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | Battery voltage is greater than 11.5 volts. |
Conditions for Setting the DTC
The PCM detects a short to ground, short to voltage, or open on the stop lamp switch signal circuit when the brakes are applied.
Action Taken When the DTC Sets
| • | The PCM stores the DTC to memory. |
| • | The PCM will record the operating conditions at the time the diagnostic failed. The PCM stores this information in Failure Records. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | You issue a scan tool CLEAR DTCs command. |
| • | A history DTC will clear once 40 malfunction-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Lighting Systems Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Perform the stoplamp switch adjustment, refer to Stop Lamp Switch Adjustment , clear all DTCs, and operate the vehicle within the Conditions for Running the DTC.
- If circuits test OK, replace the PCM.
| ⇒ | If DTC P1574 resets as current, test the stop lamp switch signal circuit for a short to ground, short to voltage, or open. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for PCM replacement, setup, and programming |
DTC P1574 TCM w/L61 w/MN5
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 Descriptor
DTC P1574 : Stop Lamp Switch CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open or High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Stop Lamp Switch Signal | P1574 | P1574 | P1574 | -- |
Circuit/System Description
The stoplamp switch is used to sense the action of the driver application of the brake pedal. The stoplamp switch will apply battery voltage to the park/stoplamp signal voltage supply circuit to illuminate the stop lamps and the center high mounted stop lamp (CHMSL). The stoplamp switch also sends a signal to the Transmission control module (TCM) as well to indicate the application of the brake pedal.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | Battery voltage is greater than 11.5 volts. |
Conditions for Setting the DTC
The TCM detects a short to ground, short to voltage, or open on the stop lamp switch signal circuit when the brakes are applied.
Action Taken When the DTC Sets
| • | The TCM stores the DTC to memory. |
| • | The TCM will record the operating conditions at the time the diagnostic failed. The TCM stores this information in Failure Records. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | You issue a scan tool CLEAR DTCs command. |
| • | A history DTC will clear once 40 malfunction-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Lighting Systems Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Perform the stoplamp switch adjustment, refer to Stop Lamp Switch Adjustment , clear all DTCs, and operate the vehicle within the Conditions for Running the DTC.
- If circuits test OK, replace the TCM.
| ⇒ | If DTC P1574 resets as current, test the stop lamp switch signal circuit for a short to ground, short to voltage, or open. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for TCM replacement, setup, and programming |
