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ECA Checks

ECA PIN VOLTAGE

Sensor/ Input SignalPin # KOEO Hot Idle 30 MPH 55 MPH
Sensors/Inputs 
TP 47 .8-.9V .8-.9V 1.0-1.1V 1.1-1.4V
SCCS 50 6.7V 6.7V 6.7V 6.7V
EVP 27 .3V .3V .3-.4V .3-2.5V
ECT 7 .6V .6V .6V .6V
ACT 25 .7-1.9V .7-1.9V .7-1.9V .7-1.9V
MAP 45 157 Hz 104-110 Hz 107-114 Hz 112-126 Hz
IDM 4 4-9 RPM 660-760 RPM 1190-1290 RPM 1460-1560 RPM
PIP 56 4-9 RPM 660-760 RPM 1190-1290 RPM 1460-1560 RPM
HEGO-R 29 0V Switching (2) Switching (2) Switching (2)
BOO 2 0V VBAT (3) 0V 0V
ACCS 10 0V VBAT (4) 0V 0V
VSS+ 3 1 MPH 1 MPH 30 MPH 55 MPH
HEGO-L 43 0V Switching (2) Switching (2) Switching (2)
NDS 30 0V 0V VBAT VBAT
STI 48 5.0V 5.0V 5.0V 5.0V
Actuators/Outputs 
INJ 4 13 VBAT (5) 4.7-5.2mS 5.2-6.4mS 6.5-8.0mS
INJ 6 15 VBAT (5) 4.7-5.2mS 5.2-6.4mS 6.5-8.0mS
INJ 5 14 VBAT (5) 4.7-5.2mS 5.2-6.4mS 6.5-8.0mS
INJ 2 59 VBAT (5) 4.7-5.2mS 5.2-6.4mS 6.5-8.0mS
INJ 1 58 VBAT (5) 4.7-5.2mS 5.2-6.4mS 6.5-8.0mS
INJ 8 52 VBAT (5) 4.7-5.2mS 5.2-6.4mS 6.5-8.0mS
EVR 33 VBAT (5) 0% 0-40% 35-60%
SCVAC 38 VBAT (5) 0% 0% 0%
STO/MIL 17 .6V VBAT VBAT VBAT
CANP 31 VBAT VBAT 6.0-7.0V 6.0-7.0V
WAC 54 .1-.2V VBAT (4) .1-.2V .1-.2V
ISC 21 VBAT 8.4-9.4V 7.3-8.8V 7.5-8.5V
INJ 7 13 VBAT (5) 4.7-5.2mS 5.2-6.4mS 6.5-8.0mS
FP 22 VBAT .8V .8V .8V
INJ 3 12 VBAT (5) 4.7-5.2mS 5.2-6.4mS 6.5-8.0mS
SPOUT 36 4-9 RPM 660-760 RPM 1190-1290 RPM 1460-1560 RPM
AM1 51 VBAT .1V .1V .1V
AM2 11 VBAT VBAT VBAT VBAT
SCVNT 35 VBAT (5) 0% 0% 0%
OTHER 
IGN TIMING TIMING N/A 22-26° 32-36° 34-38°
(1) Referenced values shown may vary +/- 20% depending on operating conditions and other factors. RPM values are axle and tire dependent.
(2) HEGO should switch from rich (red LED) to lean (green LED), or lean to rich, at least once every 3 seconds. HEGO voltage should toggle above and below .450 DCV, but should never be a negative value.
(3) Brake pedal on.
(4) A/C on.
(5) Monitor in DCV manual mode, reference pin to PWR GND (40/60).
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