How to check ecu ground

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1. Wire pin 85 of the relay to the 12v supply wire from the stock ECU that you just cut. This 12v wire will now energize the relay to turn on. So now instead of the stock ecu energizing the fuel pump, it will energize this relay. 2. Wire pin 86 to a good ground on the car.

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you cant use the stock 3g ecu or wiring harness with an h22. its just not possible. guess again there bub. if you want h22 motor, you need h22 complete wire harness and ecu. or some other obd1 ecu. so you would then check for trouble codes how you normally do with any other h22, stock or swap (a) First, check the ECU ground circuit. If it is faulty, repair it. If it is normal, the ECU could be faulty. Temporarily replace the ECU with a normally functioning one and check if the symptoms occur. If the trouble symptoms disappear, replace the original ECU. (1) Measure the resistance between the ECU ground terminal and body ground.

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A DC volt/ohm meter can be used to check the continuity of the pick-up coil. It can be checked at the leads as they leave the distributor, or on pins 4 and 5 of the ECU connector. When measuring the resistance across the two leads of the pick-up coil you should see a 150-900 ohm reading. Make sure that each displays something very close to the nominal value. If the value you find is substantially higher, your problem may be a bad PCM ground, so double-check before condemning the control unit. If the value is very low, it’s likely something has shorted to ground. Start by unplugging sensors while monitoring Vref.

We ground our shielded wire jackets directly at the SQ6M ecu. Procedures are defined for grounding the of the shielded wires. Best practice is that you leave the shield open at the sensor side for shielding to be effective. If this side is grounded in some way, the shield doesn't work. Shielded gounds are tied to a single ground point at the ...