Service Manual — page 670 of 715

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16-110 ELECTRICAL SYSTEM
Relay Box
Relay Circuit Inspection (with the battery disconnected)
                         Tester Connection        Tester Reading (Ω)
Headlight Circuit
                                   1-3                    ∞
Relay
                                   7-6                    ∞
ECU Main Relay
                                   4-5                 Not ∞*
                                   7-8                    ∞
Fuel Pump Relay
                                  9-10                 Not ∞*
                                  11-16                   ∞
Starter Circuit Relay
                                  11-12                   ∞
                                  17-20                   ∞
Fan Relay
                                  18-19                Not ∞*
   *: The actual reading varies with the tester used.

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

                    Battery            Tester
                                                      Tester Reading
                  Connection         Connection
                                                            (V)
                   (+) (–)            (+) (–)
Starter
                    16-12                 11-12       Battery Voltage
Circuit Relay
 (+): Apply positive lead.
 (–): Apply negative lead.

Diode Circuit Inspection
• Remove  the relay box (see Relay Box Removal).
• Relay Box Internal Circuit
  Check conductivity of the following pairs of terminals (see
                             in this section).
Diode Circuit Inspection
                        1-11, 2-11, 12-13, 12-15, 12-16, 13-14,
Tester Connection
                        13-15
  The resistance should be low in one direction and more
  than 10 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.