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Powertrain Management (VIN B)




DTC P0230 (LC8)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P0230

-
Fuel Pump Relay Control Circuit

Diagnostic Fault Information






Circuit/System Description

The engine control module (ECM) enables the fuel pump relay when the ignition switch is turned ON. The ECM will disable the fuel pump relay within 4 seconds unless the ECM detects ignition reference pulses. The ECM continues to enable the fuel pump relay as long as ignition reference pulses are detected. The ECM disables the fuel pump relay within 2 seconds if ignition reference pulses cease to be detected and the ignition remains ON.

The ECM monitors the voltage on the fuel pump relay control circuit. If the ECM detects an incorrect voltage on the fuel pump relay control circuit, a fuel pump relay control DTC sets.

Conditions for Running the DTC

* The ignition voltage is between 11-32 volts.

* Engine speed is greater than 0 RPM.

* DTC P0230 runs continuously when the above conditions are met.

Conditions for Setting the DTC

* The ECM 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 at least 8 out of 10 test cycles.

Action Taken When the DTC Sets

DTC P0230 is a Type B DTC.

Conditions for Clearing the MIL/DTC

DTC P0230 is a Type B DTC.

Reference Information

Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References Control Module References for scan tool information

Special Tools

J 43244 - Relay Puller Pliers

Circuit/System Verification

Note:
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.

1. Ignition ON.

2. Verify DTC P0230 is not set.

• If the DTC is set

Refer to Circuit/System Testing

• If the DTC is not set

3. Verify the parameters listed below toggle between OK and Not Run or Not Run and OK when commanding the fuel pump relay ON and OFF with a scan tool.

* Fuel Pump Relay Ckt. Short Gnd Test Status

* Fuel Pump Relay Ckt. Open Test Status

* Fuel Pump Relay Ckt. Short Volts Test Status

• If any parameter does not change

Refer to Circuit/System Testing

• If the parameters change

4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.

5. Verify the DTC does not set.

• If the DTC sets

Refer to Circuit/System Verification - step 1

• If the DTC does not set

6. All OK

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF, it may take up to 2 minutes for all vehicle systems to power down. Disconnect the KR23A fuel pump relay.

2. Test for less than 10 ohms between the fuel pump relay ground circuit and ground.

• If 10 ohms or greater

1. Ignition OFF.

2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms , repair the open/high resistance in the ground connection.

• If less than 10 ohms

3. Ignition ON, command the fuel pump relay OFF with a scan tool.

4. Verify that a test lamp does not illuminate between the control circuit and ground.

• If the test lamp illuminates

1. Ignition OFF, disconnect the X1 harness connector at the K20 engine control module, ignition ON.

2. Test for less the 1 V between the control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the K20 engine control module.

• If the test lamp does not illuminate

5. Remove the test lamp.

6. Verify the Fuel Pump Ckt. Short Gnd. Test Status parameter is OK when commanding the fuel pump relay ON with a scan tool.

• If the Fuel Pump Ckt. Short Gnd. Test Status parameter is not OK

1. Ignition OFF, disconnect the X1 harness connector at the K20 engine control module, ignition ON.

2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit

• If less than 2 ohms, replace the K20 engine control module.

• If the Fuel Pump Ckt. Short Gnd. Test Status parameter is OK

7. Install a 3 A fused jumper wire between the control circuit and the fuel pump relay ground circuit.

8. Verify the scan tool Fuel Pump Ckt. Short Gnd, Test Status parameter is Fault

• If the Fuel Pump Ckt. Short Gnd. Test Status parameter is not Fault

1. Ignition OFF, disconnect the X1 harness connector at the K20 engine control module, ignition ON.

2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit

• If less than 2 ohms, replace the K20 engine control module.

• If the Fuel Pump Ckt. Short Gnd. Test Status parameter is Fault

9. Test or replace the KR23A fuel pump relay.

Component Testing

1. Ignition OFF, disconnect the KR23A fuel pump relay.

2. Test for 70-110 ohms between terminal 85 and 86.

• If not within the specified range

Replace the KR23A fuel pump relay.

• If between 70-110 ohms

3. Test for infinite resistance between the terminals listed below:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

• If less than infinite resistance

Replace the relay

• If infinite resistance

4. Connect a 3 A fused jumper wire between relay terminal 86 and B+. Connect a jumper wire between relay terminal 85 and ground. Test for less than 2 ohms between terminals 30 and 87.

• If 2 ohms of greater

Replace the relay

• If less than 2 ohms

5. All OK

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)

* Control Module References Control Module References for Engine Control Module replacement, programming and setup

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