M84 2JZ Install

[Stephen Dean]

Hi Vlad,

There are two issues that can cause this, one being that you have a stray voltage signal feeding into one of the sensor 0V's, that pulls up the 0V, this means that the ECU can't read the signal correctly as it needs a differential between the 5V+ and the 0V to do so.

The other cause of this is that the ECU has been reverse wired and this has damaged the reverse polarity protection. If this is the case, then the ECU needs to be repaired at one of our service centres.

[Vlad]

Hi Vlad,

There are two issues that can cause this, one being that you have a stray voltage signal feeding into one of the sensor 0V's, that pulls up the 0V, this means that the ECU can't read the signal correctly as it needs a differential between the 5V+ and the 0V to do so.

The other cause of this is that the ECU has been reverse wired and this has damaged the reverse polarity protection. If this is the case, then the ECU needs to be repaired at one of our service centres.

I have wired a MPX4250 (2.5 bar map sensor) and it reads and works perfectly, with 5% filter level, opose to the motec map sensor, wich was bearly reding correct with 30+ filter...

[Scott@FP]

What coils? Make sure the coils do not have a high current power ground (primary or secondary winding) put on the ECU sensor ground.

[Vlad]

What coils? Make sure the coils do not have a high current power ground (primary or secondary winding) put on the ECU sensor ground.

I have both logic and power gnd of the coils, grounded on the engine block. Coils are red audi rs4 (TFSI WAG coils, 14amps) I use these coils allot because they don't need more than 1ms charging time.