Stalling or Not Starting?

Engine light, not starting, or stalling in your 1995-2006 Acura TL could indicate a problem with the fuel pump or fuel injection relay. I’ll guide you through diagnosing and fixing these problems. Anytime you have an engine light, it means the engine knows something you don’t.  We’ll focus on what these components do, how to locate and replace them, and related OBD codes.

Running Rough? Transmission?

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What is the Fuel Pump and Fuel Injection Relay?

1. Fuel Pump: In your TL, the fuel pump delivers fuel from the tank to the engine. It ensures a consistent supply for smooth operation.
2. Fuel Injection Relay: This relay controls the power to the fuel pump.

Symptoms

• Stalling: Your TL might stall due to insufficient fuel supply.
• Difficulty Starting: A faulty relay or pump can make starting the car tough.
• Engine Performance Issues: Hesitation or surging during acceleration.

OBD Codes

• P0230 to P0233: These codes indicate issues with the fuel pump primary circuit.
• P0627 to P0629: Related to the fuel pump control circuit.

See all the OBD codes here.

Acura TL Troubleshooting

1. Fuel Pump: Listen for humming from the fuel tank when you turn the ignition. No sound indicates a problem.
2. Fuel Injection Relay: Locate the relay in the fuse box. A damaged relay may prevent the pump from receiving power.

Testing and Replacing the Fuel Injection Relay

1. Remove: Remove the relay from the fuse box. Careful not to damage it or the surrounding fuses and relays.
2. Inspect: Inspect for any damage, burning, or corrosion.
3. Identify the Relay Terminals: Look at the schematic (usually printed on the relay) for the control circuit (coil) terminals and the load circuit terminals.
4. Test for Resistance: Set multimeter to ohms and measure the resistance across the coil terminals.  You should see a resistance reading (often between 50 to 120 ohms, but this can vary). If the multimeter shows infinite resistance or no continuity, the relay’s coil is defective.
5. Check for Switch Operation:
   • Set the multimeter to the continuity setting.
   • Test for continuity between the load circuit terminals. In the normal state (relay not energized), you should not get a continuity reading for Normally Open (NO) relays or you should get a continuity reading for Normally Closed (NC) relays.
   • To test if the switch operates, connect a battery across the coil terminals to energize the relay. You should hear a click as the relay activates.
   • Now, check for continuity again between the load circuit terminals. The reading should change (NO relays will now show continuity, NC relays will not).
6. Reinstall or Replace

Locating and Replacing the Fuel Pump

1. Locate the Pump: In the TL, the fuel pump is inside the fuel tank.
2. Access the Tank: You’ll need to remove the back seat to reach the tank’s access panel.
3. Replace the Pump: After draining the tank, you can remove and replace the pump. Be cautious of fuel spillage.

Final Thoughts

Stalling and fuel issues in your 1995-2006 Acura TL can often be traced back to the fuel pump or fuel injection relay. By following these steps, you can identify, diagnose, and solve these issues. Remember, if you’re unsure or uncomfortable performing these tasks, it’s always best to consult a professional mechanic.