Fuel Pressure: Testing and Inspection
Fuel Pressure Test
Removal
1. Fuel Filler Cap
1. Remove the fuel fill cap to relieve the pressure in the fuel tank.
2. HDS DLC - Connection
NOTE: For specific operations, refer to the user's manual that came with the Honda Diagnostic System (HDS). Make sure the HDS is loaded with the latest software.
1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the vehicle. If it does not communicate, go to the DLC circuit troubleshooting.
3. Fuel Pump Off
1. Turn the ignition switch to ON (II).
2. From the INSPECTION MENU of the HDS, select Fuel Pump OFF, then start the engine, and let it idle until it stalls.
NOTE:
* Do not allow the engine to idle above 1,000 rpm or the ECM/PCM will continue to operate the fuel pump.
* Pending or Confirmed DTC may be set during this procedure. Check for DTCs, and clear them as needed.
3. Turn the ignition switch to LOCK (0).
4. Battery Terminal - Disconnection
1. Make sure the ignition switch is in LOCK (0).
2. Disconnect and isolate the negative cable and battery sensor (A) from the battery.
NOTE: Always disconnect the negative side first.
3. Disconnect the positive cable (B) from the battery.
5. Fuel Pressure - Relieving
1. Remove the quick-connect fitting cover (A).
2. Check the fuel quick-connect fitting for dirt, and clean it if needed.
3. Place a rag or shop towel over the quick-connect fitting (A).
4. Disconnect the quick-connect fitting: Hold the connector (A) with one hand, and squeeze the retainer tabs (B) with the other hand to release them from the locking tabs (C). Pull the connector off.
NOTE:
* Be careful not to damage the line (D) or other parts.
* Do not use tools.
* If the connector does not move, keep the retainer tabs pressed down, and alternately pull and push the connector until it comes off easily.
* Do not remove the retainer from the line; once removed, the retainer must be replaced with a new one.
Test
1. Fuel Pressure - Test
NOTE: If you were referred to this procedure from a troubleshooting procedure, test the fuel pressure under the same conditions the malfunction occurred (engine rpm, load, throttle position, etc.).
1. Disconnect the quick-connect fitting, and attach the fuel pressure gauge set. Check for leaks with the gauge set attached.
2. Connect the positive and negative cables to the battery to start the engine for the next step.
3. Start the engine, and let it idle.
* If the engine starts, read the fuel pressure gauge.
* If the pump does not run, do the fuel pump circuit troubleshooting.
4. Read the fuel pressure gauge. The pressure should be 380-430 kPa (3.9-4.4 kgf/cm2, 55-63 psi).
* If the pressure is OK, the test is complete.
* If the pressure is out of specification, replace the fuel pressure regulator and the fuel filter, then recheck the fuel pressure.
Installation
1. Fuel Filler Cap
1. Install the fuel fill cap.
2. Battery Terminal - Reconnection
NOTE: If the battery performs abnormally, test the battery.
1. Clean the battery terminals.
2. Connect the positive cable (A) to the battery.
NOTE: Always connect the positive side first.
3. Connect the negative cable and battery sensor (B) to the battery.
4. Apply multipurpose grease to the terminals to prevent corrosion.
3. HDS DLC - Connection
1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the vehicle. If it does not communicate, go to the DLC circuit troubleshooting.
4. Fuel Pump On
1. From the INSPECTION MENU of the HDS, select Fuel Pump ON.
NOTE: Pending or Confirmed DTC may be set during this procedure. Check for DTCs, and clear them as needed.
2. Turn the ignition switch to LOCK (0).
5. Fuel Line Leak Check
1. Turn the ignition switch to ON (II) (but do not operate the starter motor). The fuel pump runs for about 2 seconds, and fuel pressure rises. Repeat this two or three times, then make sure there are no fuel leaks.