Montero 4WD V6-2972cc 3.0L SOHC (1991)
(3) Connect a 12V power supply (+) terminal to the terminal (3) of the control relay and measure the voltages at the terminal (2) when the (-) terminal
is connected to and disconnected from the terminal (7).
(4) If one of the above is improper replace the control relay.
ECM Power and Ground Supply Circuits
ENGINE CONTROL UNIT POWER GROUND
OPERATION
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Grounding of the engine control unit
Troubleshooting hints
If there is incorrect or incomplete contact of the engine control unit's ground line, the engine control unit will not function correctly.
HARNESS INSPECTION
Electronic Control Unit (ECU)