ECM Inputs and Outputs at Connector B (△) (49P)
NOTE: Standard battery voltage is about 12 V.
Terminal number
Wire color
Terminal name
Description
Signal
31
RED/GRN
VG+ (MASS AIR FLOW (MAF) SENSOR +SIDE)
Detects MAF sensor signal
At idle: about 1.7 V
32
RED/YEL
IAT (INTAKE AIR TEMPERATURE (IAT) SENSOR)
Detects IAT sensor signal
With ignition switch ON (II): about 0.1−4.0 V
33
BLK/RED
VG− (MASS AIR FLOW (MAF) SENSOR −SIDE)
Ground for MAF sensor signal
Less than 0.5 V at all times
34
GRN/YEL
SG2 (SENSOR GROUND)
Sensor ground
Less than 0.5 V at all times
35
GRN/YEL
VTS (ROCKER ARM OIL CONTROL SOLENOID)
Drives rocker arm oil control solenoid
At idle: about 0 V
36
WHT/RED
SHO2S (SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S) SENSOR 2)
Detects secondary HO2S (sensor 2) signal
With throttle fully opened from idle and warmed up engine: above 0.6 V
With throttle quickly closed: below 0.4 V
38
BLK/WHT
NC (OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR)
Detects output shaft (countershaft) speed sensor signal
With ignition switch ON (II): about 0 V or about 5.0 V
With driving: pulses
45
WHT/GRN
ALTC (ALTERNATOR CONTROL)
Sends alternator control signal
With warmed up engine running: about 5.0 V(depending on electrical load)
46
WHT/BLU
ALTL (ALTERNATOR L SIGNAL)
Detects alternator L signal
With ignition switch ON (II): about 0 V
With engine running: battery voltage
47
WHT/RED
ALTF (ALTERNATOR FR SIGNAL)
Detects alternator FR signal
With engine running: about 2.6−3.4 V (depending on electrical load)