Acura NSX 1997 Service Manual page 212

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Troubleshooting
Engine Control Module Terminal Arrangement (cont'd)
ECM CONNECTOR C (12P)
Terminal Wire
number color
1
YEL/BLK
2 BLU/BLK
3 RED/GRN
PNK
4*
5 BLU
6 BLK/WHT
ORN
7
8 GRN
GRN/YEL
9
GRN/BLK
10
YEL/RED
11
12 YEL
Table of Contents Table of Contents
ECM CONNECTOR C (12P)
Terminal name
IGP2 (POWER SOURCE)
ACS (A/C SWITCH SIGNAL)
PDSW (A/C PRESSURE
SWITCH B)
MTCLS (M/T CLUTCH
SWITCH)
SCS (SERVICE CHECK
SIGNAL)
STS (STARTER SWITCH
SIGNAL)
VSS (VEHICLE SPEED SEN-
SOR)
NEP (ENGINE SPEED
PULSE)
PHRST F (FRONT PEAK
HOLD RESET)
PHRST R (REAR PEAK
HOLD RESET)
MFPLS F (FRONT MISFIRE
PULSE)
MFPLS R (REAR MISFIRE
PULSE)
Wire side of female terminals
Description
Power source for the ECM
control circuit
Detects A/C switch signal
Detects A/C pressure switch
B signal
Detects M/T clutch switch
signal
Detects service check
connector signal (the signal
causing a DTC indication)
Detects starter switch signal
Detects VSS signal
Outputs engine speed pulse
Sends peak hold reset signal
Sends peak hold reset signal
Detects misfire pulse
Detects misfire pulse
NOTE: Standard battery voltage is 12 V.
*: M/T
Signal
With ignition switch ON (II): battery
voltage
With ignition switch OFF: 0 V
With A/C switch ON: 0 V
With A/C switch OFF: approx. 10 V
With A/C pressure switch B ON: 0 V
With A/C pressure switch B OFF:
approx. 5 V
With ignition switch ON (II) and
clutch pedal depressed: approx. 5 V
With ignition switch ON (II) and
clutch pedal released: 0 V
With the connector connected: 0 V
With the connector disconnected:
about 5 V or battery voltage
With starter switch ON: battery
voltage
With starter switch OFF: 0 V
With ignition switch ON (II) and rear
wheels turning: cycles 0 - 5 V
With engine running: pulses
With engine running: pulses
With engine running: pulses
With engine running: pulses
With engine running: pulses