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 P2534 00: Ignition 1 Switch Circuit Low VoltageDiagnostic Fault Information
Circuit | Short to Ground | Open or High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
IGN II/III Voltage | P2534 | P2534 | -- | -- |
Circuit/System Description
The fuel pump 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 key is in RUN or CRANK. |
| • | The engine is running. |
Conditions for Setting the DTC
| • | The FPCM detects that the IGN II/III voltage is less than 6.0 volts. |
| • | The above condition is present for 7 seconds. |
Action Taken When the DTC Sets
DTC P2534 is an A type DTC.
Conditions for Clearing the DTC
DTC P2534 is an A type DTC.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
Important: Verify that DTC P0562 is not set as current or history before performing this diagnostic. If DTC P0562 is set as current or history, go to DTC P0562 .
- Ignition OFF, disconnect the harness connector of the FPCM.
- Ignition ON, test for 11 volts or greater between the IGN II/III voltage circuit terminal 15 and ground.
- If all circuits test normal, replace the FPCM.
| ⇒ | If less than the specified voltage, test the IGN II/III voltage circuit for a short to ground or an open/high resistance. If the circuit test normal and the ECM - IGN fuse 19 is open, test the voltage circuit for a short to ground. If the circuit tests normal, test or replace the RUN/CRANK relay. |
Component Testing
Relay Test
- Ignition OFF, disconnect the RUN/CRANK relay.
- Test for 60-180 ohms of resistance between terminals 85 and 86.
- Test for infinite resistance between the following terminals:
- Install a 20-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2.0 ohms of resistance between terminals 30 and 87.
| ⇒ | If the resistance is not within the specified range, replace the relay. |
| • | 30 and 86 |
| • | 30 and 87 |
| • | 30 and 85 |
| • | 85 and 87 |
| ⇒ | If less than infinite resistance, replace the RUN/CRANK relay. |
| ⇒ | If greater than 2.0 ohms, replace the RUN/CRANK relay. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for FPCM replacement, setup, and programming |
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 P2534: Ignition 1 Switch Circuit Low VoltageDiagnostic Fault Information
Circuit | Short to Ground | Open or High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
IGN Voltage | P2534 | P2534 | -- | -- |
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 an A type DTC.
Conditions for Clearing the DTC
DTC P2534 is an A type DTC.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Verify that DTC P0562 is not set.
- Ignition OFF, disconnect the harness connector of the FPCM.
- Ignition ON, test for greater than 11 volts between the IGN voltage circuit terminal 15 and ground.
- If all circuits test normal, replace the FPCM.
| ⇒ | If DTC P0562 is set, refer to DTC P0562. |
| ⇒ | 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 ECM - IGN fuse 58 is open, test the voltage circuit for a short to ground. If the circuit tests normal, test or replace the Run/Crank relay. |
Component Testing
Relay Test
- Ignition OFF, disconnect the RUN/CRANK relay.
- Test for 60-180 ohms between terminals 85 and 86.
- Test for infinite resistance between the following terminals:
- Install a 20-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2.0 ohms between terminals 30 and 87.
| ⇒ | If the resistance is not within the specified range, replace the relay. |
| • | 30 and 86 |
| • | 30 and 87 |
| • | 30 and 85 |
| • | 85 and 87 |
| ⇒ | If less than infinite resistance, replace the RUN/CRANK relay. |
| ⇒ | If greater than 2.0 ohms, replace the RUN/CRANK relay. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for FPCM replacement, setup, and programming |
