• Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here:Diagnostic Procedure Instructions

For an overview of the component/system, refer to:Fuel System Description

This diagnostic monitors the time since last reset message from the control module K111 and counts how many resets have occurred. If the control module K20 detects the number of resets exceeds the calibration, this DTC sets.

• DTC P1000, U18A2 = Not set
• Battery Voltage=Greater than 11 V
• Ignition=OnorEngine=Running

Frequency the DTC runs=Continuously—After the running conditions are met

Control module K111 reset=Greater than a predefined threshold—For greater than 20 s

DTCs listed in the DTC Descriptor category=Type A DTC

DTCs listed in the DTC Descriptor category=Type A DTC

Engine Controls Schematics

Master Electrical Component List

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Control Module References

1. Ignition » On / Vehicle » In Service Mode
2. Verify DTC P0560–P0563, P1000, P1002, P129B, P157A, P16D7–P16D9, U18A2 is not set
• If DTC P1000 or U18A2 is set

  Refer to:Diagnostic Trouble Code (DTC) List - Vehicle

• If DTC P1000 or U18A2 is not set
3. Ignition/Vehicle & All vehicle systems » Off

Note: The battery voltage should stabilize after a few minutes of turning the ignition/vehicle Off.

4. Test for 12.4 to 12.8 V between the test points:Battery Positive Post&Battery Negative Post
• If not between 12.4 and 12.8 V

  Refer to:Battery Inspection/Test

• If between 12.4 and 12.8 V
5. Engine»Running—For greater than 15 s
6. Accessories»Off
7. Test for 13.4 to 15 V between the test points:Battery Positive Post&Battery Negative Post
• If not between 13.4 and 15 V

  Refer to:Charging System Test

• If between 13.4 and 15 V
8. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

   Verify the DTC does not set.

• If the DTC sets

  Refer to: Circuit/System Testing

• If the DTC is not set
9. All OK.

Note: Some control module ground circuits may require up to 2 min after the ignition is turned Off before achieving a resistance reading of less than 5 Ω. In most cases the readings will drop below 20 Ω within 1 min indicating the control modules are going to sleep.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector:@K111 Fuel Pump Driver Control Module
3. Test for less than 10 Ω between the test points:Ground circuit terminal 22&Ground
• If 10 Ω or greater
1. Disconnect the ground connection:Ground terminal
2. Test for less than 2 Ω between the test points:Ground circuit terminal 22@Component harness&The other end of the circuit@Ground terminal
• If 2 Ω or greater»Repair the open/high resistance in the circuit.
• If less than 2 Ω»Repair the open/high resistance in the ground connection.
• If less than 10 Ω
4. Verify a test lamp turns On between the test points:B+ circuit terminal 7&Ground
• If the test lamp does not turn On and the circuit fuse is OK
1. Remove » Test Lamp
2. Test for less than 2 Ω between the test points:B+ circuit terminal 7@Control module harness&Output terminal@Fuse
• If 2 Ω or greater»Repair the open/high resistance in the circuit.
• If less than 2 Ω»Verify the fuse is OK and there is voltage at the fuse.
• If the test lamp does not turn On and the circuit fuse is open
1. Remove » Test Lamp
2. Test for infinite resistance between the test points:B+ circuit terminal 7@Control module harness&Ground
• If less than infinite resistance»Repair the short to ground on the circuit.
• If infinite resistance»Replace the component:K111 Fuel Pump Driver Control Module
• If the test lamp turns On
5. Ignition » On / Vehicle » In Service Mode
6. Verify a test lamp turns On between the test points:Ignition circuit terminal 17&Ground
• If the test lamp does not turn On and the circuit fuse is OK
1. Ignition/Vehicle » Off & Remove » Test lamp
2. Test for less than 2 Ω between the test points:Ignition circuit terminal 17@Control module harness&Output terminal@Fuse
• If 2 Ω or greater»Repair the open/high resistance in the circuit.
• If less than 2 Ω»Verify the fuse is OK and there is voltage at the fuse.
• If the test lamp does not turn On and the circuit fuse is open
1. Ignition/Vehicle » Off & Remove » Test lamp
2. Test for infinite resistance between the test points:Ignition circuit terminal 17@Control module harness&Ground
• If less than infinite resistance»Repair the short to ground on the circuit.
• If infinite resistance»Replace the component:K111 Fuel Pump Driver Control Module
• If the test lamp turns On
7. Replace the component:K111 Fuel Pump Driver Control Module

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification

For control module replacement, programming, and setup refer to:Control Module References