FixVault
Home › Cadillac › 1998 › Catera › Repair and Diagnosis › Engine Performance › System › Engine Control System - Tests W/Codes › Diagnostic Trouble Codes › DTC P0230 - Fuel Pump Control Circuit › Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  , then go to next step.
  2. Turn ignition on, with engine off. Using scan tool, command fuel pump relay on and off. If relay turns on and off with each command, go to next step. If relay does not turn on and off with each command, go to step 5).
  3. Turn ignition off. Disconnect ECM harness connector located in engine compartment relay center. Jumper main relay control circuit to ground. Using DVOM on 10-amp scale, measure current between ground and relay control circuit at ECM harness connector, for 2 minutes. If current draw is 0.10-0.75 amp, see DIAGNOSTIC AIDS. If current draw is not 0.10-0.75 amp, go to next step.
  4. Turn ignition off. Disconnect fuel pump relay connector. Using DVOM, measure resistance between ground and relay control circuit at ECM harness connector. If resistance is infinite, go to step 11). If resistance is not infinite, go to step 9).
  5. Turn ignition off. Disconnect fuel pump relay connector. Connect test light between relay coil terminals at harness connector. Turn ignition on. Using scan tool, command fuel pump relay on and off. If test light turns on and off with each command, go to step 8). If test light does not turn on and off with each command, go to next step.
  6. With test light connected to ground, probe relay harness connector switched battery feed circuit. If test light is on, go to next step. If test light is off, go to step 10).
  7. Turn ignition off. Reconnect fuel pump relay. Disconnect ECM harness connector. Jumper main relay control circuit to ground. With fused jumper wire connected to ground, probe fuel pump relay control circuit at ECM harness connector. If relay operates, go to step 12). If relay does not operate, go to step 9).
  8. Check for poor connections at relay. Repair as necessary. After repairs, go to step 14). If connections are okay, go to step 11).
  9. Repair relay control circuit. After repairs, go to step 14).
  10. Repair switched battery feed circuit to relay. After repairs, go to step 14).
  11. Replace relay. After replacing relay, go to step 14).
  12. Check for poor connections and terminal tension at ECM harness connector. Repair as necessary. After repairs, go to step 14). If connections and terminals are okay, go to next step.
  13. Replace ECM. New ECM must be programmed with theft deterrent module frequency code currently on vehicle. After replacing ECM, go to next step.
  14. Using scan tool, clear DTCs. Turn ignition off for 15 seconds. Start engine and operate vehicle. Check for DTCs. If DTC P0230 is set, go to step 2). If DTC P0230 is not set, go to next step.
  15. If other DTCs were present during OBD system check and have not been diagnosed, go to applicable DTC. If no other DTCs are present, system is okay.
About FixVault