trinituner.com

Could be repost.. i eh know but i thought it might be helpful to our fellow DET 2ners


SR20DET wiring ECU pins and description of wire colors
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
7 - RX data (Signal from Nissan Consult hand terminal) - Green Black
8 - Coil Pack 3 Output (Via power transistor Unit) - Red White
9 - Coil Pack 4 Output (Via power transistor Unit) - Red White
10 -
11 -
12 - A/T signal DT3 (autotrans gear select ?)
13 - Ignition Signal Ground - Black
14 - CLK clock (timing signal) - Green White
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
22 - CAS 180deg signal (Crank angle sensor) - White
23 - CHK check (check start) ? - Green Red
24 - Monitor check Lamp (red) (fault code lamp output)
25 - Exhaust over temp warning lamp output - Orange
26 - Exhaust temp sensor inout (Behind the Cat) - Blue Yellow
27 - Detonation sensorinput (knock sensor) - White
28 - TPS for A/T (kick down switch)
29 - Sensor ground - Black
30 - CAS 180deg signal (crank angle sensor) - White
31 - CAS 1deg signal (crank angle sensor) - Black
32 - Speed sensor input - Yellow Green
33 -
34 - Start signal (from ignition switch) - Orange
35 - A/T neutral switch input - Green Orange
36 - IGN (ignition ON, from ignition switch) - Black Red
37 - TPS power output (power to throttle position sensor) - Light Green Red
38 - ECCS power - Black White
39 - ECCS ground - Black
40 - CAS 1 deg signal (crank angle sensor) - Red Black
41 - A/C on input (Air Con ON from A/C panel) - Blue Green
42 - A/T signal DT1 (auto trans gear select ?)
43 - Power steering switch (speed proportional control output) - Purple White
44 - A/T signal DT1 (auto trans gear select ?)
45 - Ambient air tamp sensor input - Blue White
46 - ECCS backup power - Red
47 - ECCS power - Black White
48 - ECCS ground - Black
101 - Injector No. 1 drive output - White Black
102 - EAI control solenoid output (egr valve control ?) - Orange Black
103 - Injector No.3 drive output - Green Black
104 - Fuel pump relay output - Black Purple
105 - Fuel pressure control module - Red White
106 - A/C on output (Air conditioner on relay signal) - Green Black
107 - Injector ground - Black
108 - Injector ground - Black
109 - Reverse electrical flow return circuit (alternator fail input) - Red
110 - Injector No. 2 drive output - Yellow Black
111 - Turbo boost pressure control solenoid (over boost cut ?) - Orange Black
112 - Injector No. 4 drive output - Blue Black
113 - AAC valve control (Auxiliary Air Control, Idle speed control) - Light Blue
114 -
115 -
116 - Injector ground - Black .



s13 sr20det to s13 240 wiring diagram
I got bored at 5:10am for looking for a sr motor, so I went to srswap.com and copied the wiring diagram, for the lazy bastards, to show how to do it yourself, and save a few hundred dollars!!!

There are 2 plugs on the end of the KA harness and 3 plugs on the SR harness that run up behind the stock battery location. Although the plugs do initially snap together, the wires do not line up and you have to cut the plugs off and connect the wires using the table below. Cut the 2 main KA plugs off the KA harness and splice them onto the SR harness.

red lines are SR Harness
blue lines are KA Harness

SR Harness Wire Color
Used For
KA Harness Wire Color

Black / Pink stripe
Fuel Pump Relay
Black / Pink stripe

Green / Orange stripe
Transmission Neutral Sensor
Green / Orange stripe

Red / Black stripe
ECU Relay
Red / Black stripe

Green / Yellow stripe
AC Relay
Green / Yellow stripe

Red
ECU Backup Power
Red

Black / Red & Blue / Red (Note: connect 2 wires to 1)
Main Ignition Power
Black / Red stripe

Black / White stripe
ECU Power
Black / White stripe

Blue / Green stripe
AC Relay
Blue / Green stripe

Black / Yellow stripe
Idle Air Control Valve Power
Black / Yellow stripe

Brown (to O2 sensor)
O2 Sensor Power
Any 12v switched source


my source

like I said I got really bored in the early morning of easter, so all you freeloaders here you go, please quit asking for the wiring diagram.

sorry if this has been posted before, I searched but didn't see it, so here you go!


ECU & Dash wiring

The colors on the wires that run from the ECU up into the dash matched up perfectly on both the SR ECU harness and the KA dash harness:


Wire Color
Used For

Yellow / Red stripe
Tachometer signal

Yellow / Green stripe
Speedometer signal

Orange
Ignition start

Black (may be more than one ground)
Ground

Blue / Green stripe
AC signal

Blue / Black stripe
Water temp signal

The rest of the wires are for the CONSULT diagnostic device. It is not necessary to connect any other wires than those listed above to get the SR to run properly.

Connect the remaining wires if you plan to use the onboard diagnostic CONSULT connector.

The Apexi turbo timer is connected to the O2 sensor wire at the ECU to provide auto countdown functions. The Apexi AVC-R is also attached to the ECU harness for tachometer signal, speed signal, and throttle position. Apexi products come with a very good ECU pinout diagram that is extremely useful.

Remove the brackets from the SR ECU to make it easier to mount.


yellow / Red stripe
Tachometer signal

Yellow / Green stripe
Speedometer signal

Orange
Ignition start

Black (may be more than one ground)
Ground

Blue / Black stripe
Water temp signal



Problem
1. Low Oil Pressure / Oil starvation , noisy lifters that will not quiet down -Check the oil pan for dents before starting your engine. Even the smallest dent can kill your engine!

2. No Oil Pressure / Oil pump frozen -Manually prime the pump thru the turbo oil line into the block (the lower on under the power steering pump) if you don't get immediate oil pressure. Confirm adequite oil pressure gauge, or by removing the valve cover, cover timing chain area and briefly run engine. You should see oil coming out all over the place.

3. Fuel pump not coming on -Plugs by Battery may be wired incorrectly, they plug in but won't work without rewiring. Pump should run for 3 seconds then stop if flywheel not moving.

4. No Spark -Check main ignition power wiring by battery and ECU. Also check for bad ignitor, bad coilpacks, bad ECU, shorted harness. Ignitor passes ECU pulse on to coil packs, crank the engine and test with multimeter for ignition voltage pulses at ignitor input and output to isolate source of problem.

5. Odd electrical behavior in dash, interior lights -ECU plug may not be tightened all the way down. This causes all kinds of weird different problems. Also check for mis-wired grounds (especially main power and turbo timer wiring) back-feeding power thru the ground system.

6. Won't Crank -Check Main power wiring and start signal wire to ECU, clutch interlock switch, auto trans conversion must use jumper on harness plug. Make sure car alarm or turbo timer wiring is not causing the problem.

7. Cranks, has spark & fuel either just cranks, or catches but won't run -Check Timing, Crank Angle Sensor could be misaligned. Engine could be flooded, check spark plug for raw fuel.
Runs OK, but no power Check timing, set to 15 degrees, 2nd mark from the right on crank pulley.

8. Drivable but can't boost above certain psi, or can't give more than 25% throttle without bucking -Leak in intercooler piping under boost, even a small leak will make the car sputter and buck with any significant throttle. MAFS or MAFS wiring problem.

9. Idles OK, but can't rev past 2500 rpm -MAFS or MAFS wiring problem.

Overview of accessing the ECM and Malfunction Codes

Accessing the ECM

The ECM is located in the passenger side footwell. You need to remove 2 rivet type fasteners of the right doorstep in order to get the kick panel out. To remove these, unscrew the center part and pull up on the other part. Two metal screws and another rivet type fastener hold the kick panel to the body of the car. Under the panel, is the ECM with its connector. Remove the two screws at the top and bottom of the ECM and gently turn it to get to the Model Selector and RED L.E.D. Don't unplug the ECM to do this! There should be a small sticker by the Mode Selector that tells you to turn it clockwise to set the Modes, and to be sure to return it all the way counter-clockwise to the original position when the car is in use. You will also see the RED L.E.D. inside the ECM.
Diagnostics Modes

There are two modes and two conditions for the engine to be in for running diagnostics. All modes are with the Ignition Switch in the ON position.

* Mode I (Engine OFF)- Bulb Check
* Mode I (Engine ON) - Malfunction Warning
* Mode II (Engine OFF)- Stored Self Diagnostic Results
* Mode II (Engine ON)- Exhaust Gas Sensor Monitor

Note: The ECM will automatically return to Mode I when the ignition is switched OFF. When the ECM is changed from Mode II back to Mode I by using the Mode Selector, the malfunction code(s) stored for Mode II will be erased.
Changing Modes

Switching modes is not possbile while the engine is running.

* Turn the Ignition switch ON
* The ECM is now in Mode I
* To switch to mode II:
o Turn the ECM Mode Selector fully CLOCKWISE, hold for at least 2-seconds and then return the Mode Selector to it's original position. You are now in Mode II.
o (Notes: Return to Mode I by turning the Mode Selector fully CLOCKWISE again, holding for another 2-seconds and turning it back to the original position. Doing this will ERASE any Malfunction Codes that are stored in the ECM for Mode II.)

Reading the Malfunction Codes:

The malfunction modes are indicated by the number of flashes by the RED L.E.D. and the check engine light, you can read either of them, as they both display the same thing. Example: if the red LED flashes once and after a short pause flashes twice, this resembles the number "12".

Please Note: The following chart was derrived from a 240sx service manual. Your car may be different, so please consult your manual for your car.
Code: Item:
11 Cam Position
12 MAF
13 Coolant Temp
14 Vehicle Speed
21 Primary Ingition signal
25 IACV
31 ECM
32 EGR
33 Primary O2 (fron)
34 Knock Sensor
35 EGR Temp
36 EGRC-BPT Valve
37 Closed Loop
41 IAT
43 TPS
65 Misfire, Cyl. 4
66 Misfire, Cyl. 3
67 Misfire, Cyl. 2
68 Misfire, Cyl. 1
71 Misfire, Random
72 Catalyst System
76 Fuel Injection System
77 Secondary O2 (rear)
82 Crank Position
84 A/T Diagnostics Link
95 Crank P/S Cog
98 Coolant Temp
103 A/T Park/Neutral Switch
105 EGRC Solenoid Valve
111 Inhibitor Switch
112 Vehicle Speed Sensor, A/T
113 A/T 1st Gear Signal
114 A/T 2nd Gear Signal
115 A/T 3rd Gear Signal
116 A/T 4th Gear / TCC Signal
118 Shift Solenoid Valve A
121 Shift Solenoid Valve B
123 Overrun Clutch
124 Torque Convertor Clutch
125 Line Pressure Solenoid Valve
126 TPS, A/T
127 Engine Speed Signal
128 A/T Fluid Temp Sensor







How to Check Codes
By: Nick Zluticky
Without OBD II
On G20 models, the ECU is located behind the center console. On J30, M30 and Q45 models, the ECU is located behind the RH kick panel.
If a malfunction occurs within the ECU/fuel injection system, a diagnostic trouble code may be stored in the ECU and the ‘‘Check Engine’’ lamp will blink. There is also a lamp built into the ECU which will concurrently blink. To read Code output, proceed as follows:
Turn ignition On, but do not start engine.
Using a small screwdriver, turn diagnostic mode selector switch, located on side of ECU, fully clockwise.
Wait two seconds, then rotate switch to full counterclockwise position.
A malfunction code can be read as the long (0.6 second) blink, indicating the first digit of a two digit number and the short (0.3 second) blink, indicating the second digit.
Ensure that the diagnostic switch is to the full counterclockwise position whenever the vehicle is in use.
w/OBD II
On G20 and I30 models, connect a suitable Scan Tool to the DLC, located under instrument panel fuse box cover.
Clearing Codes
If using a scan tool, follow tool manufacturer’s instructions to clear Codes.
A second, though more time consuming method of clearing codes involves using a small screwdriver to turn the diagnostic mode selector switch, located on the side of the ECM/ECU, fully clockwise. After waiting two seconds, rotate the switch to the full counterclockwise position. The diagnosis will end and memory will then be cleared.
List of Codes
Pre-OBDII
11 Crank Angle Sensor

12 Mass Air Flow Sensor

13 ECT Sensor

14 Vehicle Speed Sensor

16 TCS Signal

21 Ignition Signal Circuit

25 Idle Air Control Valve

22 Fuel Pump Control

31 ECM

32 EGR Function

33 Heated Oxygen Sensor

34 Knock Sensor

35 EGR Temperature Sensor (RH)

41 Intake Air Temperature Sensor

42 Fuel Pump Sensor

43 Throttle Position Sensor

45 Injector Leak

46 Secondary Throttle Sensor

51 Injector Analysis

53 Exhaust Gas Sensor (LH)

54 Signal Circuit From A/T Control Unit To ECM
55 System OK (1990-1995 Q45 only)

65-71 Single Cylinder Or Multiple Cylinder Misfire

72 Three Way catalyst Function

76 Fuel Injection System Function

77 Rear Heated Oxygen Sensor

82 Crankshaft Position Sensor

84 A/T Diagnosis Communication Line

91 Front Heated Oxygen Sensor Heater

103 Park/Neutral Position Switch

105 EGR & Canister Control Solenoid
OBD2 Codes
P0000 No Self Diagnostic Failure Indicated

P0100 MAF Sensor

P0105 Absolute Pressure Sensor

P0110 IAT Sensor

P0115 ECT Sensor

P0120 TP Sensor

P0125 ECT Sensor

P0130 Closed Loop, Bank 1 Or Front O2S, Bank 1

P0131 Front O2 Sensor, Bank 1 Lean Shift Monitoring

P0132 Front O2 Sensor, Bank 1 Rich Shift Monitoring

P0133 Front O2 Sensor, Bank 1 Response Monitoring

P0134 Front O2 Sensor, Bank 1 High Voltage

P0135 Front HO2S Heater, Bank 1

P0136 Rear O2S, Bank 1

P0137 Rear O2S, Bank 1 Minimum Voltage Monitoring

P0138 Rear O2S, Bank 1 Maximum Voltage Monitoring

P0139 Rear O2S, Bank 1 Response Monitoring

P0140 Rear O2S, Bank 1 High Voltage

P0141 Rear H02S Heater, Bank 1

P0150 Closed Loop, Bank 2 Or Front O2S, Bank 2

P0151 Front O2 Sensor, Bank 2 Lean Shift Monitoring

P0152 Front O2 Sensor, Bank 2 Rich Shift Monitoring

P0153 Front O2 Sensor, Bank 2 Response Monitoring

P0154 Front O2 Sensor, Bank 2 High Voltage

P0155 Front HO2S Heater, Bank 2

P0156 Rear H02S Sensor, LH Bank

P0157–P0160 Rear O2S, Bank 2

P0161 Rear H02S Heater, LH Bank Or Bank 2

P0171 Fuel System Lean, Bank 1

P0172 Fuel System Rich, Bank 1

P0174 Fuel System Lean, Bank 2

P0175 Fuel System Rich, Bank 2

P0180 Tank Fuel Temp Sensor

P0300 Random Misfire

P0301–P0308 Misfire, Cylinder No. 1–8

P0325 Knock Sensor, Bank 1

P0330 Knock Sensor, Bank 2

P0335 CKP Sensor (Pos)

P0340 CMP

P0400 EGR System

P0402 EGRC/BPT Valve

P0403 EGR Volume Control Valve Circuit

P0420 TW Catalyst System, Bank 1

P0430 TW Catalyst System, Bank 2

P0440 EVAP Small Leak

P0443 Purge Control/V & S/V

P0446 Vent Control Valve

P0450 EVAP Pressure Sensor

P0500 Vehicle Speed Sensor

P0505 IACV/AAC Valve

P0510 Closed TP Sensor

P0600 A/T Comm Line

P0605 ECM/ECU

P0705 PNP Or Inhibitor Switch

P0710 ATF Temp Sensor

P0720 VSS A/T

P0725 Engine Speed Signal

P0731 A/T 1ST Signal

P0732 A/T 2ND Signal

P0733 A/T 3RD Signal

P0734 A/T 4TH Signal Or TCC

P0740 TCC SV Solenoid

P0744 A/T TCC Signal

P0745 Line Pressure S/V

P0750 Shift Solenoid/V A

P0755 Shift Solenoid/V B

P1105 MAP/BARO Switch SOL/V

P1110 Intake Valve Timing Control, LH Bank

P1120 TP Sensor 2

P1125 Tandem TP Sensor

P1130 Swirl Control Valve Control Solenoid Valve

P1135 Intake Valve Timing Control, LH Bank 2

P1140 Intake Valve Timing Control Position Sensor, RH Bank 1

P1145 Intake Valve Timing Control Position Sensor, LH Bank 2

P1148 Closed Loop, Bank 1

P1165 Swirl Control Valve Control Vacuum Check Switch

P1168 Closed Loop, Bank 2

P1210 Traction Control Signal Circuit

P1220 FPCM

P1320 Ignition Signal, Primary

P1335 CKP Sensor (Ref)

P1336 CKP Sensor (POS) Cog

P1400 EGRC Solenoid/V

P1401 EGR Temp Sensor

P1402 EGR System

P1440 EVAP Small Leak

P1441 VC/V Bypass/V

P1443 Canister Control Vacuum Check Switch

P1444 Purge Volume Control/V

P1445 Purge Volume Control/V

P1446 Vent Control Valve

P1447 EVAP Purge Flow

P1448 Vent Control Valve

P1490 VC/V Bypass/V

P1491 VC Cut/V Bypass/V

P1492 Purge Control/V S/V

P1493 Purge Control/V & S/V

P1605 A/T Diag Comm Line

P1705 TP Sensor A/T

P1706 PNP Switch

P1760 Overrun Clutch S/V

P1900 Cooling Fan

well done..good readup!

so now that ur VET project done u tryin to help those DET cars keep up with the wingroad or wha

nice post!

^^^ heheh wait till I finish padnah

Empress thanks a lot for that info. One Question this is for all SR20DET's ? I notice that the Aviner ecu pins are slightly different from the U13 SR20DET's..

hey will this wire up work on a sr20det 4 throttle???????????

very informative good work.

Isn't this for the RWD? just asking

boxman792 wrote:hey will this wire up work on a sr20det 4 throttle???????????

^^Hoss - if you need some wiring info for the 4 throttle - pm or email me.

Excellent info there Empress !!