Ohms Measurements

CAUTION: When measuring Ohms, disconnect the ECU from the harness plug and never turn the ignition key on. It is possible that failure to follow these steps will result in damage to the ECU.




Grounds



Magnetic Coil Sensors



Coolant Temperature Sensor



Air Temperature Sensor



Throttle Switch



Altitude Sensor



Air Flow Sensor
1 Flap on air flow sensor closed or air flow sensor plate at rest position. Resistance increases as flap or plate opens.
2 Flap on air flow sensor opened to maximum or air flow plate deflected to maximum.



Single Injector



Injector Groups(s)



Fuel Pump Relay
* Does not apply to 911 Carrera.



ISC Valve
** 924S only.