POWER/GROUND OVERVIEW
| Switched 12Vs | B/W, 49, 59, 109 | all come from ECCS relay, connected inside the harness |
| Grounds | 50, 60 and 110, 20,07,108,116 | these go to body ground in 2 groups |
GROUND LAYOUT (ORIGINAL HARNESS)
| ECU pin | function | proposed usage | notes |
| 50, 60 | GND for: CAS, Air.Reg Shielding for: CAS, NBO signal, KS, MAF | tie to Sensor GND | goes to Engine Ground 1 |
| 10 20 107 108 116 | GND for: FICD, Ign. Transistors, Injectors, Idle valve, O2 heater seems like a Power GND | use as Power GND TBC how thick? | goes to Engine Ground 2 |
| 26 | MAF GND | tie to Sensor GND | originated from ECU |
| 30 | TPS GND, ECT GND | tie to Sensor GND | originated from ECU |
![[Orig. Ground Wiring]](http://gtlamateurfest.uw.hu/nissan/2013-01-CAS-oscope/GroundWiringDiagram.jpg){kind=link}
Wire assignments (that I already know):
| ECU pin | color | orig.func | location of remote end | VEMS pin | new function | comment |
| 1 | R/W | Ign.1 | d/c | EC36 pin 35 | TTL output req. | |
| 2 | R/Y | Ign.2 | d/c | EC36 pin 33 | TTL output req. | |
| 3 | R/G | Ign.3 | d/c | EC36 pin 34 | TTL output req. | |
| 11 | R/L | Ign.4 | d/c | EC36 pin 36 | TTL output req. | |
| 101 | W/B | Inj. 1 | d/c | EC36 pin 7 | ||
| 110 | Y/B | Inj. 2 | d/c | EC36 pin 19 | ||
| 103 | G/B | Inj. 3 | d/c | EC36 pin 8 | ||
| 112 | L/B | Inj. 4 | d/c | EC36 pin 20 | ||
| 41 | G/Y | CAS TDC strobes | d/c | EC36 pin 27 | primary trigger | |
| 51 | " | " | " | " | " | " |
| 42 | G/B | CAS degree pulse | d/c | EC36 pin 13 | secondary trigger | |
| 52 | " | " | " | " | " | " |
| 18 | B/P | fuel pump relay | d/c | EC36 pin 15 | low-side switched | |
| 54 | Y/W | Idle sw. - | TB left side | EC36 pin 28 | ||
| 27 | G/B | MAF signal | front of engine | EC18 pin 6 | ||
| 26 | B | MAF ground | front of engine | TBD | was common with other B pins in Nissan ECU | |
| 57 | Y | Idle sw. + | left side of throttle body | EC36 pin 2 | IAT | |
| 48 | LG/R | TPS supply | d/c | EC36 pin 29 | ||
| 38 | LG/B | TPS signal | d/c | EC36 pin 1 | ||
| 30 | B | ECT+TPS ground | at TB | EC39 pin 5 | sens. comm. GND | Q |
| 7 | Y/R | tach. signal | d/c | EC36 pin4 | voltage level or PWM? | |
| 106 | SB | idle control valve | d/c | EC36 pin 17 | idle control valve | picked Inj_H channel for this (PWM) |
| 23 | W | knock sensor | d/c | EC18 pin 1 | ||
| 28 | L/OR | ECT signal | d/c | EC36 pin 14 | ||
| 16 | R/B | ECCS relay | d/c | n/a | own switching circuit, see top of page | |
| 45 | B/R | Ign. switch | d/c | n/a | own switching circuit, see top of page | |
| 58 | R | Constant 12V | d/c | EC36 pin 23 | FLYBACK, direct path to Injector common (resistors common) | |
| 29 | W | O2 sensor | d/c | EC18 pin 13 | WBO2 (Nernst) signal | |
| 115 | L | O2 heater | d/c | EC18 pin 18 | WBO2 heater |
New wires to be laid for new functions
| G | WBO2 pump+ | WBO2 area | EC18 pin 9 | |
| Y | WBO2 pump- | WBO2 area | EC18 pin 7 | |
| 'TBD' | MAP +5V | rear of intake manifold | EC36 pin 28 | |
| 'TBD' | MAP signal | rear of intake manifold | EC18 pin 6 |
Wires still needed for new functions
| Oil pressure. sensor | will add later | |
| EBP sensor | will add later | |
| Water temp. sensor | will add later | |
| Water pressure sensor | will add later | |
Wires freed up (no equivalent function on VEMS, or not YET assigned to a VEMS function):
| ECU pin | color | function | location of remote end | comment |
| 6 | G/Y | A/C relay | ? a harness around the exhaust side | low side switch |
| 17 | ? | Check Connector | ? inside | |
| 32 | ? | Check Connector | ? inside | |
| 33 | ? | Check Connector | ? Inside | |
| 43 | OR | starting signal | ? key, probably | |
| 44 | G/OR | neutral switch | ?probably merges into harness around firewall | |
| 46 | L/G | A/C switch | ? inside | (A/C switch + blower on) -> 0V |
| 47 | ? | Check Connector | ? Inside | |
| 53 | Y/G | VSS | from gauge cluster | |
| 56 | ? | A/T control unit | ? | could be missing |
| 111 | PU | PR control solenoid | next to ign. power transistors | low side switch |