Subaru Workshop Service and Repair Manuals

ECU Connectors

CHECK VOLTAGE AND RESISTANCE

1.

With ignition "ON" and engine not running, measure voltage across ECU connector terminals as follows:

Connector & terminal:

Voltage:

(F120)6-(F121)1

Below 1V (fully closed throttle)

(F120)6-(F121)2

Above 8V (fully open throttle)

2.

With ignition "OFF," disconnect ECU connector and measure resistance between ECU connector and switch connector as follows:

Connector & terminal:

Resistance:

(F120)6-(F108)3

Below 1 Ohm

(F119)1-(F108)2

Below 1 Ohm

(F120)10-(F108)2

Below 1 Ohm

(F120)6-Ground

Infinite

(F119)1-Ground

Below 10 Ohms

(F120)10-Ground

Below 10 Ohms

Idle/Throttle Switch Testing

CHECK IDLE/THROTTLE SWITCH

1.

With ignition "OFF," disconnect switch connector.

2.

Measure resistance between switch connector terminals as follows:

Connector & terminal:

Resistance:

(F108)3-(F108)2

Below 1 Ohm (fully closed throttle)

(F108)3-(F108)2

Infinite (fully open throttle)