Powertrain Management (Without FPCM)
DTC P0230 (Without FPCM)
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 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.
Conditions for Running the DTC
* The ignition voltage is between 11-32 volts.
* DTC P0230 runs continuously when the above conditions are met.
Conditions for Setting the DTC
* 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 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 (except L96) [1][2]Electrical DiagramsEngine Controls Schematics (L96) [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, 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.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the KR23A fuel pump relay.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohm between the ground circuit terminal 85 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Verify that a test lamp does not illuminate between the relay coil control circuit terminal 86 and the ground circuit terminal 85.
• If the test lamp illuminates, test the relay coil control circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
5. Remove the test lamp.
6. Command the fuel pump relay ON with a scan tool. Verify the scan tool Fuel Pump Relay Ckt. Short Gnd. Test Status parameter is OK.
• If not the specified value, test the fuel pump relay coil control circuit for a short to ground. If the circuit tests normal, replace the K20 engine control module.
7. Install a 3 A fused jumper wire between the relay coil control circuit terminal 86 and the ground circuit terminal 85. Command the fuel pump relay ON with a scan tool. Verify the scan tool Fuel Pump Relay Ckt. Short Gnd. Test Status parameter is Fault
• If not the specified value, test the relay coil control circuit for an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
8. Verify that a test lamp does not illuminate between the component control circuit terminal 87 and ground.
• If the test lamp illuminates, test the component control circuit for a short to voltage.
9. Ignition OFF, disconnect the harness connector at the fuel tank sending unit.
10. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohm between the fuel pump ground circuit terminal A and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
11. Connect the harness connector at the fuel tank sending unit.
12. Ignition ON, connect a 15 A fused jumper wire between the B+ circuit terminal 30 and the component control circuit terminal 87. Verify the fuel pump is activated.
• If the fuel pump does not activate, test the component control circuit for an open/high resistance. If the circuit tests normal, test or replace the fuel tank fuel pump module.
13. If all circuit test normal; test or replace the KR23A fuel pump relay.
Component Testing
1. Ignition OFF, disconnect the KR23A fuel pump relay.
2. Test for 70-110 ohm between terminal 85 and 86
• If not within the specified range, replace the KR23A fuel pump relay.
3. Test for infinite resistance between the following terminals:
* 30 and 86
* 30 and 87
* 30 and 85
* 85 and 87
• If not the specified value, replace the KR23A fuel pump relay.
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 ohm between terminals 30 and 87.
• If greater than the specified range, replace the KR23A fuel pump relay.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Fuel Tank Fuel Pump Module Replacement (15 Ext/Crew Cab With 26 Gal Tank) Fuel Tank Fuel Pump Module Replacement (15 Ext/Crew Cab With 26 Gal Tank)Fuel Tank Fuel Pump Module Replacement (15 Reg Cab With 26 Gal Tank) Fuel Tank Fuel Pump Module Replacement (15 Reg Cab With 26 Gal Tank)Fuel Tank Fuel Pump Module Replacement (15 Reg/Ext/Crew Cab w/34 Gal Tank) Fuel Tank Fuel Pump Module Replacement (15 Reg/Ext/Crew Cab w/34 Gal Tank)Fuel Tank Fuel Pump Module Replacement (25/35 Series) Fuel Tank Fuel Pump Module Replacement (25/35 Series)
* Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)
* Control Module References Control Module References for Engine Control Module replacement, programming and setup.