Voltage Measurements

35 Position ECU Plug:

Connector View

GROUNDS
KEY OFF
Pin G1 to 9 0.0 - 0.1V
Pin G1 to 18 0.0 - 0.1V
Pin G1 to 16 0.0 - 0.1V
KEY ON
Pin G1 to 9 0.0 - 0.1V
Pin G1 to 18 0.0 - 0.1V
Pin G1 to 16 0.0 - 0.1V

IGNITION SWITCH
Pin 9 to 35 (ON/OFF) 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 - 9.5V

COOLANT TEMPERATURE SENSOR
Pin 9 to 10
68°F 1.0 - 2.0V
176°F - 194°F 0.3 - 0.7V

AIR TEMPERATURE SENSOR
Pin 9 to 24
68°F 2.4 - 3.5V
104°F - 122°F 1.0 - 2.5V

IDLE SWITCH
Pin 9 to 20
Closed 11 - 14V
Opened 0.0 - 1.0V

FUEL ENRICHMENT SWITCH
Pin 9 to 26
Closed 11 - 14V
Open 0.0 - 1.0V

DECELERATION FUEL CUTOFF VALVE
Pin 9 to 26
Closed 11.0 - 13.0V
Open 0.0 - 1.0V

FREQUENCY VALVE
Pin 9 to 8
Cold 60 - 70% Duty Cycle
Warm 45 - 55% Duty Cycle
When the engine is warmed up the duty cycle will vary between 45 and 55% in closed loop.

FUEL PUMP RELAY
Pin 9 to 21
Key ON 11 - 13V
Cranking <2V
Idling 0.0 - 1.0V

OXYGEN SENSOR
Pin 9 to 30
Key ON 0.4 - 0.5V
Engine 2000 rpm 0.1 - 0.8V
- O2 sensor must warm up before varying between .10 and .80 volts.
- Before engine goes into closed loop voltage will be .45 on pin #30.

COLD START VALVE
Pin 9 to 1
Cool engine (cranking) 0.0 - 1.0V
Cold start valve will shut off while cranking in less than 4 secs.
Warm engine (cranking) 9 - 11V

BOOST PRESSURE LIMIT SOLENOID
Closed 11 - 14.5V
Opened 0.0 - 1.0V

CARBON CANISTER SHUT OFF VALVE
Pin 9 to 23 (engine idling) 11 - 13V

BRAKE LIGHT SWITCH
Pin 9 to 32
Brakes applied 11 - 13V
Brakes not applied 0.0 - 1.0V

CARBON CANISTER PURGE VALVE
Pin 9 to 3 (Key ON) 11 - 13V