Operating Voltage at Pump Connector

Standard- BatterY Voltage (12.5 V or more) for 3 seconds, and then 0 V.

• If the reading stays on battery voltage, and never shows 0 V. Check the ECU and fuel pump relay.

• If the voltage is in specification, but the pump doesn’t work, replace the pump.

• If there is still no battery voltage, check the pump relay (see this chapter).

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1. ECU

2. Ignition Switch

3. ECU Main Relay

4. Fuel Pump Relay

5. ECU Fuse 15 A

6. Main Fuse 30 A

7. Starter Relay

8. Battery

9. Fuel Pump

10. Engine Stop Switch

11. Junction Box

12. Ignition Fuse 10 A

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FUEL SYSTEM (DFI) 3-51

Fuel Pump Relay Removal

Caution

Never drop the relay, especially on a hard surface. Such a shock to the relay can damage it.

• Remove:

Seats (see Frame chapter)

• Remove the fuel pump relay [A] from the bracket and dis­connect the connector.

Fuel Pump Relay Inspection

• Remove the fuel pump relay (see above).

• Connect the hand tester [A] and one 12 V battery [B] to the relay connector [C] as shown.

Special Tool - Hand Tester: 57001-1394 Relay Coil Terminals [1] and [2]

Relay Switch Terminals [3] and [4]

Testing Relay

Tester range: 1 ft range

Criteria: When battery is connected —> 0 12

When battery is disconnected -» « ft

• If the relay does not work as specified, replace the relay.

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Fuel Pump Relay

3. Ignition Switch

4. ECU Main Relay

5. Fuel Pump Relay

6. ECU Fuse 15 A

9. Battery

10. Engine Stop Switch

11. Ignition Fuse 10 A

12. Junction Box

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FUEL SYSTEM (DFI) 3-53

CAUTION

Never drop the injector, especially on a hard sur­face. Such a shock to the injector can damage it.

Audible Inspection

• Start the engine.

• Apply the tip of a screwdriver [A] to the injector [Bj. Put the grip end onto your ear, and listen whether the injector is clicking or not.

• A sound scope can also be used.

• Do the same for the other injector.

• If all the injectors click at a regular intervals, the injectors are good.

oThe click interval becomes shorter as the engine speed rises.

• If either injector doesn't click, perform the “Injector Signal Test” for injector operation.

Injector Signal Test

• Prepare two test light sets with male terminals as shown.

Rating of Bulb [A]: 12 V x 3 - 3.4 W Terminal Width [Bj: 1.8 mm (0.07 in)

Terminal Thickness [C]: 0.8 mm (0.03 in)

CAUTION ^{* •}

Do not use larger terminals than specified above. A larger terminal could damage the injector main har­ness connector (female), leading to harness repair or replacement.

Be sure to connect bulbs in series. The bulb works as a current limiter to protect the solenoid in the injector from excessive current.

• Remove connectors for injector [A],

• Connect each test light set [B] to the injector sub harness connector [Cj.

• Turn the ignition switch ON.

• While cranking the engine with the starter motor, watch the test lights.

• If the test lights flicker at regular intervals, the injector circuit in the ECU, and the wiring are good. Perform the “Injector Resistance Inspection”.

O Injector signals can be also confirmed by connecting the hand tester (x 10 V AC) instead of the test light set to the injector main harness (female) connector. Crank the engine with the starter motor, and check to see if the hand oscillates at regular intervals.

Special Tool - Hand Tester: 57001-1394 ★ If the test light doesn't flicker (or the test hand doesn’t oscillates), check the wiring and connectors again. If the wiring is good, check the injector voltage.

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