Fuel Delivery and Air Induction: Testing and Inspection
Jumper Installation:
1. CHECK FUEL PUMP OPERATION
- Using a suitable jumper wire, connect terminals +B and FP of the data link connector 1.
- Turn the ignition switch ON.
NOTICE: Do not start the engine.
Checking Fuel Pump Operation:
- Check that there is pressure in the hose from the fuel filter.
HINT: At this time, you will hear fuel return noise.
2. CHECK FUEL PRESSURE
- Check that the battery voltage is above 12 volts.
- Disconnect the cable from the negative (-) terminal of the battery.
CAUTION: With Airbag work must be started after approx. 30 seconds or longer from the time the ignition switch is turned to the LOCK position and the negative (-) terminal cable is disconnected from the battery.
Cold Start Valve Line:
- Disconnect the cold start injector connector.
- Put a suitable container or shop towel under the cold start injector pipe (No.2 fuel pipe).
- Remove the union bolt and two gaskets, and disconnect the cold start injector pipe from the cold start injector.
HINT: Slowly loosen the union bolt.
Connecting Pressure Gauge:
- Install pressure gauge to the cold start injector with three new gaskets and the union bolt.
Torque: 15 Nm (150 kgf.cm. 11 ft.lbs)
- Wipe off any splattered gasoline.
- Remove jumper wire.
- Turn the ignition switch OFF.
- If there is no pressure. check the following parts:
^ Fusible link
^ Fuses (AM2 30A, EFI 15A, IGN 7.5A)
^ SFI main relay
^ Fuel pump
^ ECM
^ Wiring connections
- Using a suitable jumper wire, connect terminals +B and FP of the data link connector 1.
- Reconnect the battery negative (-) cable.
- Turn the ignition switch ON.
- Measure the fuel pressure.
Fuel pressure: 265-304 kPa (2.7-3.1 kgf/cm2, 38-44 psi)
- If pressure is high, replace the fuel pressure regulator.
- If pressure is low, check the following parts:
^ Fuel hoses and connection
^ Fuel pump
^ Fuel filter
^ Fuel pressure regulator
^ Injector
- Remove jumper wire.
- Start the engine.
Fuel Pressure Test - No Vacuum To Regulator:
- Disconnect the vacuum sensing hose from the fuel pressure regulator, and plug the hose end.
- Measure the fuel pressure at idle.
Fuel pressure: 265-304 kPa (2.7-3.1 kgf/cm2, 38-44 psi)
Fuel Pressure Test - Vacuum To Regulator:
- Reconnect the vacuum sensing hose to the fuel pressure regulator.
- Measure the fuel pressure at idle.
Fuel pressure: 226-265 kPa (2.3-2.6 kgf/cm2. 33-37 psi)
- If pressure is not as specified, check the vacuum sensing hose and fuel pressure regulator.
- Stop the engine. Check that the fuel pressure remains 147 kPa (1.5 kgf/cm2, 21 psi) or more for 5 minutes after the engine is turned off.
- If pressure is not as specified, check the fuel pump, pressure regulator and/or injector.
- After checking fuel pressure, disconnect the battery negative (-) cable and carefully remove the pressure gauge to prevent gasoline from splashing.
- Connect the cold start injector pipe (No.2 fuel pipe) with two new gaskets and the union bolt.
Torque: 15 N-m (150 kgf.cm, 11 ft.lbs)
- Reconnect the cold start injector connector.
- Reconnect the cable to the negative (-) terminal of the battery.
- Check for fuel leakage.