4000,S L4-1781cc 1.8L SOHC (MG) (1985)
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Engine Control Module: Testing and Inspection
Voltage Measurements
25 Position ECU Plug
For Terminal ID please refer to "Powertrain Management : Computers and Control Systems : Engine Control Module : Connector Views". See:
Diagrams/Connector Views
GROUNDS
KEY ON
Pin 2 to G1 ..................................................................................................................................................................................................... 0 - 0.5V
Pin 7 to G1 ..................................................................................................................................................................................................... 0 - 0.5V
Pin 15 to G1 .................................................................................................................................................................................................... 0 - 0.5V
Pin 20 to G1 .................................................................................................................................................................................................... 0 - 0.5V
Pin 22 to G1 .................................................................................................................................................................................................... 0 - 0.5V
IGNITION SWITCH
Pin 9 to 35
KEY OFF ..................................................................................................................................................................................................... 0.0 - 0.5V
KEY ON ...................................................................................................................................................................................................... 0.0 - 0.5V
MAIN RELAY SUPPLY
Pin 9 to 5
Key OFF ...................................................................................................................................................................................................... 0.0 - 0.5V
Key ON ....................................................................................................................................................................................................... 13 - 14.5V
HALL REFERENCE VOLTAGE
Pin 9 to 25
Key OFF ...................................................................................................................................................................................................... 0.0 - 0.5V
Key ON ...................................................................................................................................................................................................... 8.5 - 14.5V
COOLANT TEMPERATURE SENSOR
Pin 2 to 21
68°F ............................................................................................................................................................................................................. 1.6 - 1.8V
176°F - 194°F .............................................................................................................................................................................................. 0.3 - 0.4V
ELECTRO-HYDRAULIC ACTUATOR
Pin 4 to 35 (key on) ............................................................................................................................................................................................ 1.1 - 1.3V
Temperature effects this reading.
Pin 5 to 35 (key on) ............................................................................................................................................................................................ 3.0 - 3.9V
OXYGEN SENSOR
Pin 7 to 35
Key ON ........................................................................................................................................................................................................ 0.4 - 0.5V
Engine Idling ................................................................................................................................................................................................ 0.1 - 0.8V
IDLE SWITCH
Pin 2 to 13
Closed ............................................................................................................................................................................................................ 10 - 12V
Opened ............................................................................................................................................................................................................... 0 - 1V
FUEL ENRICHMENT SWITCH
Pin 2 to 5
Closed ................................................................................................................................................................................................................ 0 - 1V
Open ............................................................................................................................................................................................................... 10 - 12V
