What are the colors of the SR20DET ECU?
1 – Coil Pack 1 Output (Via power transistor Unit) – Red White 2 – Coil Pack 2 Output (Via power transistor Unit) – Red Yellow 3 – Tachometer signal output – Yellow Red 4 – ECCS Relay – Red Black 5 – Ignition Pulse Monitor (For Trip Comp ?) 6 – Ignition Signal Ground – Black
What kind of ignition system does a SR20DET have?
The standard ignition system in SR20DET engines is quite good. It features coil on plug ignition instead of a distributor (SR20DE) . Most misfires and other problems come from the age of the components rather than an inherent design deficiency. The ECU references its internal tables and sets a target ignition timing for a given load and RPM.
Is the S15 coil pack compatible with the SR20DET?
S15 have a ‘smart’ coil, as the igniter is inbuilt into each coil pack, meaning the raw ECU signal can be wired to them directly. It should be clear then that S15 coil packs are not compatible with earlier model SR20DETs due to this. The S14 ignition schematic below shows the power transistor unit in place.
How does SR20DET work on Yaris ignition coils?
As the Yaris coils have a power transistor built in, The factory SR20DET igniter chip needs to go. The new coils are expecting a 5 V signal, so connecting them to the standard chip which aims to ground a 12 V current when switched by the ECU will not get us very far. It is the equivalent of connecting the new coil’s input signal to ground.
1 – Coil Pack 1 Output (Via power transistor Unit) – Red White 2 – Coil Pack 2 Output (Via power transistor Unit) – Red Yellow 3 – Tachometer signal output – Yellow Red 4 – ECCS Relay – Red Black 5 – Ignition Pulse Monitor (For Trip Comp ?) 6 – Ignition Signal Ground – Black
As the Yaris coils have a power transistor built in, The factory SR20DET igniter chip needs to go. The new coils are expecting a 5 V signal, so connecting them to the standard chip which aims to ground a 12 V current when switched by the ECU will not get us very far. It is the equivalent of connecting the new coil’s input signal to ground.
S15 have a ‘smart’ coil, as the igniter is inbuilt into each coil pack, meaning the raw ECU signal can be wired to them directly. It should be clear then that S15 coil packs are not compatible with earlier model SR20DETs due to this. The S14 ignition schematic below shows the power transistor unit in place.
How to pin out colors on SR20DET wiring diagram?
15 – TX data (signal to Nissan Consult hand terminal) – Green 16 – MAFS signal input ( Mass Air Flow Sensor ) – White 17 – MAFS ground – Black 18 – Water Temp Sensor input – Blue Brown 19 – Oxyen Sensor input (O2) – White 20 – TPS input (throttle postion sensor) – White 21 – Sensor ground – Black