the wiring pinouts are written on the ECU PCB itself. The codings in toyota speak are
BATT - live all the time
B+ - switched positive
NSW/STA = engine start signal
E01 = direct negative (earth)
E21 = sensor earth (thin wires - sensor first then joins at the main grounding junction)
NE = crank sensor signal
10 = injector pair 1&2
20 = injector pair 3&4
HT = O2 sensor heater circuit (unused in 5AFE usually)
RSO = rotary solenoid open (idle speed controller)
RSC = rotary solenoid close (idle speed controller)
ISC = idle speed control (A/C system extra solenoid)
IGT = ignitor trigger to coil
IGF = ignition event feedback from coil
THW = water temperature sensor
THA = air temperature sensor
PIM = map sensor
OX = oxygen sensor feedback
VTA = throttle position sensor variator
IDL = idle position switch in throttle position sensor
VC = control voltage 5V to TPS and MAP and oxygen sensor <-- if 4 wire oxy sensor
TE1 = diagnosis mode
TE2 = sensitive diagnosis
VF = diagnosis connector
SPD = speedo sensor input
FC = fuel cut (controls circuit opening relay)
AC1 = AC signal ON
ACT = AC engaged verification signal aka A/C tach
W = check engine warning lamp