1227727

From GM Wiki

Contents 1 Service Number 2 Description 3 Applications 4 MEMCAL IDs 5 EPROM type 6 Schematics 7 Pinout

Service Number

1227727

See Also:

• 16197128
• 16198260

Description

The 1227727 ECM is an underhood/weatherproof version of the 1227730. The ECM pinouts are different but the calibrations are the same. The pictures below are from http://www.rowand.net/Shop/Tech/GMTPISwap.htm - there are more pictures and details there.

Applications

• 1990-92 2.5 L4 TBI “R” LR8 (“W” body)
• 1988-89 2.8 V6 PFI “W” LB6 (“W” body)
• 1989-93 3.1 V6 PFI “T” LH0 (“W” body)
• 1989-90 3.1 V6 PFI “V” LG5 (Turbo "W" body)
• 1990-91 5.7 V8 TPI “8” L98 (“Y” body)

MEMCAL IDs

• “R”: APTW
• “W”: AMAS, APWM, ATRA
• “T”: ARCX, ARZW, ATSN, ATSP, AUMY
• “V”: ASAN, ASMF, ATMJ, ATMK, AUAD, AUAF, AUFR, AZRC
• “8”: ANHT, ARFP

EPROM type

• 27C128
• 27C256

Schematics

1227727 Schematics
Active Inputs	Connectors	Ignition	Injection
Input/Output Expansion	Outputs	Passive Inputs	Power Supply
Processor

Pinout

1227730/ 1227749 pin	Connection	Function	1227727 pin	Function	Connection	1227730/ 1227749 pin
E3 E4 E6 E5 F8 E8 E9 F7 E10 F9 --	U21-1 U21-2 U21-4 U21-5 U20-3 U18-5 U18-11 U18-13 U6-5 via 10K U6-12 via 100 & 200K, CAL-29 via 100 NC	IAC A Hi IAC A Lo IAC B Lo IAC B Hi Quad Driver (Port) Quad Driver (Fan) Quad Driver (PWM) Quad Driver (PWM) MAT3 (1K to 5V) ESC (100 & 4.02K to 5V) --	A1 A12 A7 A18 A2 A13 A8 A19 A3 A14 A9 A20 A4 A15 A10 A21 A5 A16 A11 A22 A6 A17	Quad Driver (PWM) Quad Driver (PWM) Quad Driver (Port) Quad Driver (Port) MAT2 (1K to 5V) Fuel Pump Volts ??? -- O2 Hi O2 Lo ESC Tap (10K & 470K to GND)	U19-11 U19-13 U19-5 U19-3 U6-1 via 10K U5-7 via 33.2K U11-5 via ? & ? NC U7-7 via 100 U7-5 via 100 U13-15 via 10K, CAL-32 via 10K	F1 F2 F3 F4 B3 E13 E11 -- E14 E15 B8
1227730/ 1227749 pin	Connection	Function	1227727 pin	Function	Connection	1227730/ 1227749 pin
E7 F6 -- B11 E12 B7 -- A6 A8 & A9 A8 & A9 F10	U18-3 U20-5 NC U24-11 U5-8 via 10K U5-12 via 10K NC U5-2 via 33.2K U12-23 via 10 U12-23 via 10 U13-17 via 100K	Quad Driver (SES) Quad Driver (Port) -- VSS 4000 ALDL Mode (10K to 5V) ALDL Mode2 (10K to 5V) -- Battery (Run&Start) ALDL Data ALDL Data MAF (1.2K to 5V)	B1 B12 B7 B18 B2 B13 B8 B19 B3 B14 B9 B20 B4 B15 B10 B21 B5 B16 B11 B22 B6 B17	Fan Request (1.2K to GND) Digital Input (1.2K to 12V) -- -- VSS 2000 Digital Input (1.2K to 12V) Digital Input (1.2K to 12V) VSS Optical (1.2K to 12V) VSS 2000 -- --	U10-7 via 100K U10-4 via 100K NC NC U24-13 U10-1 via 100K U10-3 via 100K U13-13 via 100K U24-14 NC NC	C4 C3 -- -- C1 D2 D3 C6 B12 -- --
1227730/ 1227749 pin	Connection	Function	1227727 pin	Function	Connection	1227730/ 1227749 pin
B1 & C16 A4 & A5 B10 B9 C7 C8 F16 B5 & B6 B5 & B6 C5 A12 & D1	RV3 U17-8 U24-4 via 51K Ground U13-21 via 270 U13-24 via 200 U5-9 via 10K Ground Ground U15-26 via 270 & 33.2K Ground	Battery Sensor 5V VSS Magnetic Hi VSS Magnetic Lo EST Bypass EST MAT (1K to 5V) Sensor Ground Sensor Ground EST2 Hi Ground	C1 C12 C7 C18 C2 C13 C8 C19 C3 C14 C9 C20 C4 C15 C10 C21 C5 C16 C11 C22 C6 C17	Sensor 5V TPS2 (220K to GND) Quad Driver (PWM) Analog Input (2K to 5V) Analog Input (348 to 5V) Digital Input (1.2K to 12V) TPS (220K to GND) MAP2 (51K to GND) CTS (348/4K to 5V) MAP (51K to GND) A/C Request (1.2K to GND)	U17-8 U6-13 via 10K U20-11 & U20-13 U6-15 via 10K U6-14 via 10K U10-6 via 100K U5-6 via 10K U5-1 via 18K U5-5 via 10K U5-4 via 18K U13-41 via 100K	A4 & A5 A3 F5 F11 F12 D4 F13 F14 E16 F15 C9
1227730/ 1227749 pin	Connection	Function	1227727 pin	Function	Connection	1227730/ 1227749 pin
C13 A11 A2 D5 C11 & C12 C11 & C12 D6 & D7 D6 & D7 C15 D16 D15	Q2-S U25-2 U16-2 U13-5 Q1-D Q1-D Q1-S Q1-S U15-5 U13-34 via 100K U13-35 via 100K	Injector B Ground Fuel Pump Relay Relay2 Injector A Sense Injector A Injector A Injector A Ground Injector A Ground Injector B Sense Digital Input (1.2K to 12V) Digital Input (1.2K to 12V)	D1 D12 D7 D18 D2 D13 D8 D19 D3 D14 D9 D20 D4 D15 D10 D21 D5 D16 D11 D22 D6 D17	Ground Digital Input (1.2K to 12V) EST Hi ESt Lo Injector B Brake (1.2K to GND) Digital Input (1.2K to 12V) Digital Input (1.2K to 12V) Digital Input (1.2K to 12V) Digital Input (1.2K to 12V) Battery	Ground U10-2 via 100K U13-26 via 270 & 33.2K U13-27 via 270 & 33.2K Q2-D U13-38 via 200K U13-39 via 100K U13-40 via 100K U13-37 via 100K U13-36 via 100K RV3	A12 & D1 A7 D8 D9 C10 D10 D11 D12 D13 D14 B1 & C16
1227730/ 1227749 pin	Connection	Function	1227727 pin	Function	Connection	1227730/ 1227749 pin