12 V 3.4 w Bulb (Other Side) → bl Lead Terminal Battery (–) → bk Lead Terminal

If the test light turn on, the reserve switch is defective. Replace the fuel level sensor.

_• Remove the fuel pump (see Fuel Pump Removal in the Fuel System (DFI) chapter).

_• Connect the test light (12 V 3.4 W bulb in a socket with

leads) and the 12 V battery to the fuel pump connector as

shown.

12 V Battery [A] Test Light [B]

Fuel Pump Connector [C] Fuel Reserve Switch [D]

If the test light doesn’t light, replace the fuel pump.

NOTE

○^{It may take a long time to turn on the test light in case}

that the fuel reserve switch is inspected just after the

fuel pump is removed. Leave the fuel reserve switch with leads for inspection connected for few minutes.

The relay box [A] has relays and diodes. The relays and diodes can not be removed.

Relay Box Removal

_• Remove:

Fuel Tank (see Fuel Tank Removal in the Fuel System

(DFI) chapter)

_• Take out the relay box [A] and disconnect the connectors [B].

Relay Circuit Inspection

_• Remove the relay box (see Relay Box Removal).

_• Check conductivity of the following numbered terminals

by connecting the hand tester and one 12 V battery to the

relay box as shown (see Relay Box Internal Circuit in this section).

If the tester does not read as specified, replace the relay box.

Relay Circuit Inspection (with the battery disconnected)

	Tester Connection	Tester Reading (Ω)
Headlight Relay	1-3	∞
ECU Main Relay	7-6	∞
	4-5	Not ∞*
Fuel Pump Relay	7-8	∞
	9-10	Not ∞*
Starter Circuit Relay	11-16	∞
	11-12	∞
Fan Relay	17-20	∞
	18-19	Not ∞*

*: The actual reading varies with the hand tester used.

Relay Box

Relay Circuit Inspection (with the battery connected)

	Battery Connection (+) (–)	Tester Connection	Tester Reading (Ω)
ECU Main Relay	2-11	1-3	0
	4-5	7-6	0
Fuel Pump Relay	9-10	7-8	0
Fan Relay	18-19	17-20	0

	Battery Connection (+) (–)	Tester Connection DC 25 V Range	Tester Reading (V)
Starter Circuit Relay	16-12	11-12	Battery Voltage

(+): Apply positive lead. (–): Apply negative lead.

Diode Circuit Inspection

_• Remove the relay box (see Relay Box Removal).

_• Check conductivity of the following pairs of terminals (see

Relay Box Internal Circuit in this section).

Diode Circuit Inspection

The resistance should be low in one direction and more than ten times as much in the other direction. If any diode shows low or high in both directions, the diode is defective and the relay box must be replaced.

NOTE

○^{The actual meter reading varies with the meter or tester}

used and the individual diodes, but generally speaking,

the lower reading should be from zero to one half the scale.

Relay Box Internal Circuit

A: Headlight Relay B: ECU Main Relay C: Fuel Pump Relay

D: Starter Circuit Relay E: Fan Relay

Fuse