The 1986 TBI Logic Module

[ Natural Connector | Black Connector ]

Description

This page contains information specific to the 1986 TBI (throttle body injected, non-turbo) logic module. If you are not familiar with what the logic module is, please see the Understanding The Chrysler Engine Control Unit page before reading this one.

These logic modules use a Motorola 6803 processor. The software is stored in a 8kx8 PROM, while the calibration data tables are stored in a 8kx8 EPROM (27C64). The MAP sensor is built into the logic module case and connected internally.

The 1986 TBI logic modules were not used in L-body vehicles because the TBI engine was not available for it. The L-bodies had either the carbureted or turbocharged 2.2L engine.

Connectors

The logic module has two 25-pin connectors. 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

Natural connector

Pin	Circuit	Wire Gauge	Wire Color	Function
1	-	-	-	Not used
2	K16	22	VT/YL*	Injector control signal
3	-	-	-	Not used
4	-	-	-	Not used
5	R31	22	DG/OR*	Voltage regulation signal
6	K15	22	YL	Anti dwell signal
7	K14	18	DB/WT*	Ignition "start"/"run" feed from power module (J2)
8	K14	18	DB/WT*	Ignition "start"/"run" feed from power module (J2)
9	-	-	-	Not used
10	N7	18	GY/BK*	Ignition reference sensor signal
11	DK21	20	PK	Serial communications interface (TX)
12	T21	22	GY/LB*	Tachometer gauge signal
13	DK20	20	LG	Serial communications interface (RX)
14	Z6	22	LB/BK*	Navigator fuel monitor signal
15	U3	20	OR/BK*	Fuel pacer lamp
16	N4	18	BK/YL*	AIS motor output (winding 2)
17	K19	20	DB/YL*	ASD relay control output to power module
18	N1	18	GY/RD*	AIS motor output (winding 2)
19	-	-	-	Not used
20	N3	18	VT/BK*	AIS motor output (winding 1)
21	C27	20	DB/PK*	Radiator fan relay output
22	N2	18	BR/WT*	AIS motor output (winding 1)
23	N6	18	OR	7.5V power supply from power module
24	K5	18	BK/WT*	Signal ground source from top rear of engine
25	N5	18	BK/LB*	Signal ground to sensors

Black Connector

Pin	Circuit	Wire Gauge	Wire Color	Function
1	K6	18	OR/WT*	5.0V power supply to TPS
2	J11	20	RD/WT*	Direct battery feed (via power module)
3	N13	20	DB/OR*	A/C cutout relay output
4	K3	22	BK/PK*	Power loss lamp output
5	S6	20	GY/YL*	Purge canister solenoid output
6	-	-	-	Not used
7	K9	18	LB/RD*	Power ground source from top rear of engine
8	K9	18	LB/RD*	Power ground source from top rear of engine
9	X31	22	BR/RD*	Not used
10	X33	22	WT	Not used
11	C2	18	BR	A/C damped pressure switch signal
12	S4	20	BR/YL*	Park/neutral safety switch signal
13	D40	18	WT/PK*	Brake switch signal
14	G7	20	WT/OR*	Speed/distance sensor signal
15	-	-	-	Not used
16	-	-	-	Not used
17	-	-	-	Not used
18	N11	18	BK	Oxygen sensor signal
19	-	-	-	Not used
20	K22	22	RD/BK*	Battery temperature sensor signal
21	K7	18	OR/DB*	Throttle position sensor (TPS) signal
22	J11	20	RD/WT*	Voltage regulation sense signal
23	K10	20	TN/BK*	Coolant temperature sensor signal
24	-	-	-	Not used
25	K13	18	BK/RD*	Throttle body temperature sensor signal

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Updated 06/15/2006.