Service Repair Manual

MPI SYSTEM
Control Relay
CAUTION
When applying battery voltage directly, make sure that it is
applied to the correct terminal. Otherwise, the relay could be
damaged.
NOTE
Failure of the control relay interrupts power supply to the fuel
pump, injectors and ECU, resulting in start failure.
1. Check continuity between the terminals when the relay coil
is energized and when it is not.
NOTE
In the following tables, the arrows indicate the direction
of the current flow.
Confirm circuit tester polarity before checking continuity.
o Coils L
1
and L
2
Condition
Measuring
terminals
Continuity
Not
energized
1-4
3-8
2-8
Non-conductive (MI)
Conductive (approx. 950)
Energized
6-7 Conductive (approx. 35R)
1-4
Conductive (On)
NOTE
“Energized” means voltage applied across terminals 6 and
7.
o Coil L
3
NOTE
“Energized” means voltage applied across terminals 5 and
7.
2. If the result is not satisfactory, replace the control relay.
31-52