Ground
| Ground |
Ground
Pins 24 and 25 of the electronic control module are connected to ground at grounding point G7P. The ignition discharge module is also grounded at grounding point G7P. The engine will not start unless it is connected to ground.Sensor ground
The crankshaft position sensor, manifold absolute pressure sensor, intake air temperature sensor, engine coolant temperature sensor, throttle position sensor and fuel tank pressure sensor are grounded via pin 67 of the electronic control module. The leads connected to the crankshaft position sensor and the leads from the oxygen sensors are also screened via pin 67 of the electronic control module. The engine will not start without sensor ground.
Reference ground
On pin 66 the ECM receives reference ground from the sensor ground lead so that it can measure the engine coolant temperature with extra precision. Driveability problems while the engine is warming up will occur if reference ground is not connected to pin 66.The main instrument uses the sensor ground lead as a reference ground so that it can measure the pressure in the intake manifold with particularly great precision. Pressure cannot be measured if there is no reference ground from the Trionic system.
The engine control module receives reference ground on pin 47 from the two heated oxygen sensors.
This project is supported by memberships and donations. If you use this site, please consider Joining SCNA and/or making a donation.
Our Friends
