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ECM/PCM Inputs and Outputs at Connector C (22P)

Fig 1: Identifying ECM/PCM Connector C (22P)
G05448865Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE: Standard battery voltage is about 12 V.
ECM/PCM CONNECTOR C REFERENCE TABLE

Terminal number Wire color Terminal name Description Signal
1(1) BLK/BLU LSA (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A) Drives A/T clutch pressure control solenoid valve A With ignition switch ON (II): current control
2(1) GRN SHC (SHIFT SOLENOID VALVE C) Drives shift solenoid valve C With engine running in N and 1 position, or in D position (in 1st, 3rd, and 5th gears): battery voltage
With engine running in P, R, 2, or D position (in 2nd, 4th gears): about 0 V
3(1) YEL SHE (SHIFT SOLENOID VALVE E) Drives shift solenoid valve E With engine running in P, R position: battery voltage
With engine running in N, D, 2, or 1 position: about 0V
4(1) GRN/WHT SHB (SHIFT SOLENOID VALVE B) Drives shift solenoid valve B With engine running in P, R, N, 2, and 1 position, or D position (in 1st, 2nd gears): battery voltage
With engine running in D position (in 3rd, 4th, 5th gears):about 0 V
5(1) GRN/RED SHD (SHIFT SOLENOID VALVE D) Drives shift solenoid valve D With engine running in 2 or D position (in 2nd, 5th gears): battery voltage
With engine running in P, R, N, 1 position, or D position (in 1st, 3rd, 4th gears): about 0V
6(1) BLU/BLK SHA (SHIFT SOLENOID VALVE A) Drives shift solenoid valve A With engine running in R and 1 position, or D position (in 1st, 4th, 5th gears): battery voltage
With engine running in P, N and 2 position, or D position (in 2nd, 3rd gears): about 0 V
7(1) BLU/YEL LSC (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C) Drivers A/T clutch pressure control solenoid valve C With ignition switch ON (II): current control
9(1) BRN ATP1 (TRANSMISSION RANGE SWITCH 1 POSITION) Detects transmission range switch 1 position signal input In 1 position: about 0 V
In any position other than 1 position: battery voltage
10(1) BLU/WHT OP3SW (3RD CLUTCH TRANSMISSION FLUID PRESSURE SWITCH) Detects 3rd clutch transmission fluid pressure switch signal input With ignition switch ON (II): about 5.0 V
With 3rd clutch pressure: 0 V
11(1) BLU ATP2 (TRANSMISSION RANGE SWITCH 2 POSITION) Detects transmission range switch 2 position signal input In 2 position: about 0V
In any position other than 2 position: battery voltage
12(1) RED/WHT ATPRVS (TRANSMISSION RANGE SWITCH R POSITION) Detects transmission range switch R position signal input In R position: about 0 V
In any position other than R position: battery voltage
(1) A/T
Fig 2: Identifying ECM/PCM Connector C (22P)
G05448866Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE: Standard battery voltage is about 12 V.
ECM/PCM CONNECTOR C REFERENCE TABLE

Terminal number Wire color Terminal name Description Signal
13(1) BLU/RED OP2SW (2ND CLUTCH TRANSMISSION FLUID PRESSURE SWITCH) Detects 2nd clutch transmission fluid pressure switch signal input With ignition switch ON (II): about 5.0 V
With 2nd clutch pressure: 0 V
14(1) RED/YEL ATFT (ATF TEMPERATURE SENSOR) Detects ATF temperature sensor signal input With ignition switch ON (II): about 0.2-4.8 V (depending on ATF temperature)
15(1) BRN/WHT LSB (AH" CLUTCH PRESSURE CONTROL SOLENOID VALVE B) Drives A/T clutch pressure control solenoid valve B With the ignition switch ON (II): current control
17(1) YEL/GRN ATPD (TRANSMISSION RANGE SWITCH D POSITION) Detects transmission range switch D position signal In D position: about 0 V
In any position other than D position: battery voltage
18(1) YEL/RED ATPFWD (TRANSMISSION RANGE SWITCH D/2/1 POSITION) Detects transmission range switch D, 2, or 1 position signal In D, 2, or 1 position: about 0 V
In P, R, N position: battery voltage
19(1) WHT/RED NM (MAINSHAFT SPEED SENSOR) Detects input shaft (mainshaft) speed sensor signal With ignition switch ON (II): about 0 V or about 5.0 V
With engine running in N position: about 2.5 V
20(1) RED/BLK ATPN (TRANSMISSION RANGE SWITCH N POSITION) Detects transmission range switch N position signal In N position: about 0 V
In any position other than N position: battery voltage
21 BLK/RED VG- (MASS AIR FLOW) (MAF) SENSOR - SIDE) Ground for MAF sensor signal -
22 RED/GRN VG+ (MASS AIR FLOW) (MAF) SENSOR +SIDE) Detects MAF sensor signal At idle: about 1.1-1.6V (between VG+ terminal and VG- terminal)
(1) A/T