• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Fuel Pump Relay Control | P0230 | P0230 | P0230 | -- |
The engine control module (ECM) sends the fuel enable signal to the fuel pump control module (FPCM). The control module monitors the voltage on the fuel pump relay control circuit. If the control module detects an incorrect voltage on the fuel pump relay control circuit, a fuel pump relay control DTC sets.
The control module monitors the voltage on the fuel pump relay control circuit. If the control module detects an incorrect voltage on the fuel pump relay control circuit, a fuel pump relay control DTC sets.
• | The ignition voltage is between 9-18 volts. |
• | DTC P0230 runs continuously when the above conditions are met. |
• | The control module detects that the commanded state of the driver and the actual state of the control circuit do not match. |
• | The above condition is met for a minimum of 2.5 seconds. |
DTC P0230 is a Type B DTC.
DTC P0230 is a Type B DTC.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
With the ignition ON, engine OFF, command the fuel pump ON and OFF several times using the scan tool output control function. You should either hear or feel the fuel pump with each command.
⇒ | If the test lamp does not turn ON and OFF, test for an open, high resistance, or a short to ground in the fuel pump relay control circuit, an intermittent or a poor connection at the engine control module (ECM). If the circuit tests normal, replace the control module. |
⇒ | If the test lamp remains illuminated with each command, test for a short to voltage in the control circuit of the fuel pump relay or an intermittent or a poor connection at the ECM. If the circuit tests normal, replace the control module. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM and FPCM replacement, setup, and programming
• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Battery Voltage - Relay Switch Side | ¹ | ² | -- | -- |
Fuel Pump Supply Voltage | ¹ | ² | ³ | -- |
Fuel Pump Relay Control | P0230 | P0230 | P0230 | -- |
Fuel Pump Relay Ground | -- | P0230 | -- | -- |
Fuel Pump Ground | -- | ² | -- | -- |
¹Open fuel pump fuse, cranks no start ²Cranks no start ³Fuel pump operates continuously, then discharged battery |
The control module enables the fuel pump relay when the ignition switch is turned ON. The control module will disable the fuel pump relay within 2 seconds unless the control module detects ignition reference pulses. The control module continues to enable the fuel pump relay as long as ignition reference pulses are detected. The control module disables the fuel pump relay within 2 seconds if ignition reference pulses cease to be detected and the ignition remains ON.
The control module monitors the voltage on the fuel pump relay control circuit. If the control module detects an incorrect voltage on the fuel pump relay control circuit, a fuel pump relay control DTC sets.
• | The ignition voltage is between 9-18 volts. |
• | DTC P0230 runs continuously when the above conditions are met. |
• | The control module detects that the commanded state of the driver and the actual state of the control circuit do not match. |
• | The above condition is met for a minimum of 2.5 seconds. |
DTC P0230 is a Type B DTC.
DTC P0230 is a Type B DTC.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
J 43244 Relay Puller Pliers
Important: An open or a short to voltage in the control circuit will cause both the Ckt. Open Test Status and the Ckt. Short Volts Test Status parameters to display Fault.
• | Ignition ON, command the fuel pump relay ON and OFF with a scan tool while observing the following control circuit status parameters: |
- | Fuel Pump Relay Ckt. Short Gnd Test Status |
- | Fuel Pump Relay Ckt. Open Test Status |
- | Fuel Pump Relay Ckt. Short Volts Test Status |
• | Each parameter should toggle between OK and Not Run or Not Run and OK. |
⇒ | If the test lamp does not illuminate, test the ground circuit for a short to voltage or an open/high resistance. |
⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If not the specified value, test the fuel pump relay control circuit for a short to ground. If the circuit tests normal, replace the ECM. |
⇒ | If not the specified value, test the fuel pump relay control circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |