Diagnostic Instructions
DTC Descriptor
DTC P2533: Ignition 1 Switch Circuit
DTC P2533 06: Ignition 1 Switch Circuit Short to Ground or Open
Circuit/System Description
The engine control module (ECM) uses the ignition 1 voltage circuit to monitor system voltage. Voltage that is out of range will cause damage to components and incorrect input readings.
Conditions for Running the DTC
• | The DTC runs once per ignition cycle once the above condition is met. |
Conditions for Setting the DTC
The ECM detects an open or a short to ground on the Ignition 1 Voltage Circuit.
Action Taken When the DTC Sets
DTC P2533 is a Type B DTC.
Conditions for Clearing the DTC
DTC P2533 is a Type B DTC.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Circuit/System Verification
- Ignition ON, observe the scan tool ignition 1 data parameter. The parameter should indicate the circuit is active.
- Observe the DTC information with a scan tool. DTC P2533 should not set.
- If the vehicle passes the Circuit/System Verification test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.
Circuit/System Testing
- Ignition OFF, disconnect the ECM harness connector X1.
- Ignition ON, measure the voltage on the ignition 1 voltage circuit terminal X1-28. The DMM should display battery voltage.
⇒ | If less than the specified range, test the circuit for an open or a short to ground. |
- Verify a test lamp illuminates between the ignition 1 voltage circuit terminal X1-28 and ground.
⇒ | If the test lamp does not illuminate, repair the ignition 1 circuit for a high resistance. |
- If the circuit/connections test normal replace the ECM.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for ECM replacement, setup, and programming