The 1988 - 1989 Turbo I SMEC

[ 60 Way Connector | 14 Way Connector ]

Description

This page contains information specific to the 1988 and 1989 Turbo I Single Module Engine Controller (SMEC). If you are not familiar with what the SMEC is, please see the Understanding The Chrysler Engine Control Unit page before reading this one.

The SMEC uses a Motorola 6811 processor, which has twice the processing power of the 6803 that was used in the logic modules, reducing the loop time to 11 milliseconds. The software and calibration tables are stored in a single 16kx8 EEPROM (27C128).

Functionally, the 1988 and 1989 Turbo I SMECs are not the same and are therefore are not interchangeable. The 1988 Turbo I SMEC is calibrated for a 2.2L engine while the 1989 Turbo I SMEC is calibrated for a 2.5L engine. Internally they also differ, particularly in the software. The 1988 SMECs are based largely on the 1987 logic module code, while the 1989 SMECs appear to have a great deal of new code. This provided some additional functionality, such as greater on board diagnostic capability, returning from limp-in mode while driving if a sensor starts working again, etc).

Connectors

The SMEC has two connectors: one bolt-on 60-way connector, which leads to the logic board and one 14-way large pin connector, which leads to the power board. The following sections contain a diagram and pin-out for each. The wire colors are in the color/tracer* format (BK/WT* = black wire with a white tracer). Below is a list of color abbreviations:

Code	Color	Code	Color	Code	Color
BK	Black	LB	Light Blue	TN	Tan
BR	Brown	LG	Light Green	VT	Violet
DB	Dark Blue	OR	Orange	WT	White
DG	Dark Green	PK	Pink	YL	Yellow
GY	Grey	RD	Red	*	tracer

60 Way Connector

Pin	Circuit	Wire Gauge	Wire Color	Function
1	K4	20	DG/RD*	MAP sensor signal
2	N12	18	BK/LG*	Detonation sensor signal
3	K10	20	TN/WT*	Coolant temperature sensor signal
4	N5	18	BK/LB*	Signal ground to sensors
5	K5	16	BK/WT*	Signal ground source from fuel rail bolt
6	-	-	-	Not used
7	X33	20	WT/LG*	Speed control switch resume signal
8	X32	20	YL/RD*	Speed control switch on/off signal
9	X31	20	BR/RD*	Speed control switch set signal
10	Z1	16	DG/BK*	Automatic shutdown (ASD) relay output sense
11	-	-	-	Not used
12	K14	18	DB/WT*	Ignition "start"/"run" power feed from power board (J2)
13	K8	20	VT/WT*	5V power supply to MAP sensor and TPS
14	R31	20	DG/OR*	Voltage regulation signal to power board
15	K9	18	LB/RD*	Power ground source from fuel rail bolt
16	K9	18	LB/RD*	Power ground source from fuel rail bolt
17	N2	18	BR/WT*	AIS motor output (winding 1)
18	N4	18	YL/BK*	AIS motor output (winding 2)
19	N1	18	GY/RD*	AIS motor output (winding 2)
20	N3	18	VT/BK*	AIS motor output (winding 1)
21	-	-	-	Not used
22	K7	18	OR/DB*	Throttle position sensor (TPS) signal
23	N11	18	BK/DG*	Heated oxygen sensor signal
24	-	-	-	Not used
25	-	-	-	Not used
26	Y7	18	TN/YL*	Fuel injector sync pickup sensor signal
27	-	-	-	Not used
28	-	-	-	Not used
29	D40	18	WT/PK*	Brake pedal switch signal
30	S4	20	BR/YL*	Neutral safety switch signal
31	DK20	20	LG	Serial communications interface (RX)
32	Y1	20	GY/WT*	Fuel injector control signal #2 to power board
33	K16	20	VT/YL*	Fuel injector control signal #1 to power board
34	K15	20	YL	Anti dwell control signal to power board
35	-	-	-	Not used
36	Z6	20	LB/BK*	Fuel monitor signal to electronic navigator
37	-	-	-	Not used
38	Y4	20	LB	Barometric pressure read solenoid output
39	Y6	20	LB/BK*	Wastegate control solenoid output
40	-	-	-
41	J1	16	RD	Direct battery feed
42	-	-	-	Not used
43	-	-	-	Not used
44	-	-	-	Not used
45	C20	18	BR	A/C damped pressure switch signal
46	-	-	-	Not used
47	N7	18	GY/BK*	Ignition reference sensor signal
48	G7	20	WT/OR*	Speed/Distance sensor signal
49	-	-	-	Not used
50	T21	20	GY/LB*	Tachometer signal to instrument cluster
51	DK21	20	PK	Serial communications interface (TX)
52	N6	18	OR	8V power feed from power board
53	X36	20	TN/RD*	Speed control servo output (vacuum)
54	K1	20	PK/WT*	Purge canister solenoid output
55	-	-	-	Not used
56	N13	20	DB/OR*	A/C cutout (WOT) relay output
57	C27	20	DB/PK*	Radiator fan relay output
58	K19	20	DB/YL*	ASD relay output
59	K3	20	BK/PK*	Check engine lamp output
60	X35	20	LG/RD*	Speed control servo output (vent)

14 Way Connector

Pin	Circuit	Wire Gauge	Wire Color	Function
1	N6	18	OR	8V power supply to logic board
2	K5	16	BK/WT*	Signal ground source from fuel rail bolt
3	K14	18	DB/WT*	Ignition "start"/"run" power feed to logic board and ASD relay (J2)
4	J2	14	DB	Ignition "start"/"run" power feed
5	Y1	20	GY/WT*	Fuel injector control signal #2 from logic board
6	J9	16	BK	Power ground source from fuel rail bolt
7	J9	16	BK	Power ground source from fuel rail bolt
8	K16	20	VT/YL*	Fuel injector control signal #1 from logic board
9	Y11	18	WT	Fuel injector driver #1 output
10	Y12	18	TN	Fuel injector driver #2 output
11	R31	20	DG/OR*	Voltage regulation signal from logic board
12	J5	18	BK/YL*	Ignition coil driver output
13	K15	20	YL	Anti dwell control signal from logic board
14	R3	18	DG	Alternator field coil driver output

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Updated 12/08/2004.