GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    • Perform the Diagnostic System Check - Vehicle
    • Review Strategy Based Diagnosis
    •  Diagnostic Procedure Instructions

DTC Descriptor

DTC P2534: Ignition 1 Switch Circuit Low Voltage

Diagnostic Fault Information

Circuit

Short to Ground

Open or High Resistance

Short to Voltage

Signal Performance

IGN Voltage

P2534

P2534

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Circuit/System Description

The fuel pump flow control module (FPCM) monitors the ignition voltage circuit in order to determine if the voltage is within the normal operating range.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

The FPCM detects that the IGN voltage is less than 6.0 volts.

Action Taken When the DTC Sets

DTC P2534 is a Type A DTC.

Conditions for Clearing the DTC

DTC P2534 is a Type A DTC.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Fuel System Description

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

Circuit/System Testing

  1. Verify that DTC P0562 is not set.
  2. If DTC P0562 is set, refer to DTC P0562
  3. Ignition OFF, disconnect the harness connector of the K27 FPCM.
  4. Ignition ON, test for greater than 11 V between the IGN voltage circuit terminal 32 and ground.
  5. If less than the specified voltage, test the IGN voltage circuit for a short to ground or an open/high resistance. If the circuit test normal and the F67UA fuse is open, test the voltage circuit for a short to ground. If the circuit tests normal, test or replace the Run/Crank relay.
  6. If all circuits test normal, replace the K27 FPCM.

Repair Instructions

Perform the Diagnostic Repair Verification

    •  Relay Replacement
    •  Control Module References