For an ECM, Chrysler began using the Single Board Engine Controller (a.k.a. SBEC I) in 1990 and offered in on Turbo I configurations through 1992. When converting a Gen-2 van, acquiring the right SBEC is a priority. But which Turbo SBEC?  The 1990-91 Turbo SBECs or the very hard to find 1992 Dodge Daytona SBEC. For technical reasons the 1992 unit would be the better choice for a post-92-and up Gen-2, but they are impossible to find and no one offers re-calibrated 92 Turbo SBECs. The solution? Simply run dual SBECs. (Thanks, Dave, great idea!)

I use the 90-91 Turbo SBEC for all vital Engine Control Management (ECM), while the original 93 TBI SBEC is retained and used as a VSS (vehicle speed sensor) to CCD-Bus speedometer driver. While the arrangement sounds like a kludge, there's plenty of room to tuck the second SBEC behind the battery and no one knows the difference. As the "backup" SBEC is not required to control fuel injectors, the electronics run relatively cool. Using the original TBI SBEC is also necessary if you choose to accommodate the 93's original Speed Control system.

The following table shows the SBEC pin outs from 1990 to 1992 for the Turbo I. Also shown is the rare 1993 Flexible Fuel (FF) SMPI and the common garden-variety 1993 TBI SBEC.  Note:  the FF SMPI is interesting to study, as it shares the 90-91 Turbo's SMPI wiring but with the 93 body changes. But the FF SBEC's are rare and their fuel delivery tables would need to be re-programmed for Turbo duty. Chrysler circuit designations and abbreviations are followed.

Major changes in 1992 included moving ASD (Auto Shutdown) pin 8 in (90-91) to pin 57 in 92-up. Also a electronically driven speedometer was driven over the CCD Bus and the speed control switchgear was simplified. 

Speed Control MODE Switches in 1990-91 occupied SBEC pins 48, 49, 50. In 1992 & up Speed Controls (SC) were simplified to only use SBEC pin 23 for Mode Switching. Mopar simply added three voltage-dropping resistors within the wheel-mounted speed control switch assembly, permitting the 93 SBEC to sense SET or RESUME (Decel or Accel) or a single wire by voltage changes. Speed Control output solenoid servo control SBEC pins 33 and 53 remained unchanged. The actual speed control servos appear to be interchangeable.

The intake manifold Charge Air Temperature sensor signal used on factory intercooled SBEC;s (Turbo II, Turbo III, and Turbo IV) is also shown on pin 21, (normally not wired or used on on the stock Turbo I SBEC). Note: The Charge Air Temp sensor is grouded, along with other sensors at SBEC pin 4; or, K4 Sensor Return Ground.

Pin	1990-1991 Turbo I SMPI (Click here for schematic)	1992 Turbo I SMPI	1993 Flex Fuel SMPI (AA Body)	1993 TBI (AS Body)
1	K1 MAP Sen Sig	K1 MAP Sen Sig	K1 MAP Sen Sig	K1 MAP Sen Sig
2	K2 ECT Sen Sig	K2 ECT Sen Sig	K2 ECT Sen Sig	K2 ECT Sen Sig
3	A14 Fused B+ battery	A14 Fused B+ battery	A14 Fused B+ battery	A14 Fused B+ battery
4	K4 Sen Return Ground	K4 Sen Return Ground	K4 Sen Return Ground	K4 Sen Return Ground
5	Z11 Sig Ground	Z11 Sig Ground	Z11 Sig Ground	Z11 Sig Ground
6	K6 5 vDC Supply (MAP/TPS)	K6 5 vDC Supply (MAP/TPS)	K6 5 vDC Supply (MAP/TPS)	K6 5 vDC Supply (MAP/TPS)
7	K7 8 vDC Supply (Cam/Crank)	K7 8 vDC Supply (Cam/Crank)	K7 8 vDC Supply (Cam/Crank)	K7 8 vDC Supply (Cam/Crank)
8	A61 ASD // Inj -Sens // Alt Feed	NA	F20 Fused Ign Sw Strt/Run	F20 Fused Ign Sw Strt/Run
9	A21 Fused Ign Sw Strt/Run	A21 Fused Ign Sw Strt/Run	A21 Fused Ign Sw Strt/Run	A21 Fused Ign Sw Strt/Run
10	NA	NA	NA	NA
11	Z12 Power Ground	Z12 Power Ground	Z12 Power Ground	Z12 Power Ground
12	Z12 Power Ground	Z12 Power Ground	Z12 Power Ground	Z12 Power Ground
13	K14 Inj #4 Driver	K14 Inj #4 Driver	K14 Inj #4 Driver	NA
14	K13 Inj #3 Driver	K13 Inj #3 Driver	K13 Inj #3 Driver	NA
15	K12 Inj #2 Driver	K12 Inj #2 Driver	K12 Inj #2 Driver	NA
16	K11 Inj #1 Driver	K11 Inj #1 Driver	K11 Inj #1 Driver	K11 Inj #1 Driver
17	NA	NA	NA	NA
18	NA	NA	NA	NA
19	K19 Ign Coil Driver	K19 Ign Coil Driver	K19 Ign Coil Driver	K19 Ign Coil Driver
20	K20 Gen Field Driver	K20 Gen Field Driver	K20 Gen Field Driver	K20 Gen Field Driver
21	K21 Charge Air Temp Sen Sig (opt. w/ Intercooler)	NA	K121 FF Sens Sig	NA
22	K22 TPS Sen Sig	K22 TPS Sen Sig	K22 TPS Sen Sig	K22 TPS Sen Sig
23	NA	V37 Spd Cntrl Mode Sw Sig	V37 Spd Cntrl Mode Sw Sig	V37 Spd Cntrl Mode Sw Sig
24	K24 Crank Pos Sen Sig	K24 Crank Pos Sen Sig	K24 Crank Pos Sen Sig	K24 Crank Pos Sen Sig
25	D21 SCI Xmit	D21 SCI Xmit	D21 SCI Xmit	D21 SCI Xmit
26	D1 CCD Bus+	D1 CCD Bus+	D1 CCD Bus+	D1 CCD Bus+
27	C20 A/C Sw Sen	C20 A/C Sw Sen	C20 A/C Sw Sen	C20 A/C Sw Sen
28	NA	NA	NA	NA
29	K29 Brake Sw Sen	K29 Brake Sw Sen	K29 Brake Sw Sen	K29 Brake Sw Sen
30	T24 Clutch Sw Sen	T41 Clutch Sw Sen	T41 Clutch Sw Sen	T41 Clutch Sw Sen
31	C27 Rad Fan Relay Cntrl	C27 Rad Fan Relay Cntrl	C27 Rad Fan Relay Cntrl	C27 Rad Fan Relay Cntrl
32	G3 Check Eng Lmp Driver	G3 Check Eng Lmp Driver	G3 Check Eng Lmp Driver	G3 Check Eng Lmp Driver
33	V36 Spd Cntrl Vac Solnd Cntrl	V36 Spd Cntrl Vac Solnd Cntrl	V36 Spd Cntrl Vac Solnd Cntrl	V36 Spd Cntrl Vac Solnd Cntrl
34	C13 A/C Cmp Cltch Relay Cntrl	C13 A/C Cmp Cltch Relay Cntrl	C13 A/C Cmp Cltch Relay Cntrl	C13 A/C Cmp Cltch Relay Cntrl
35	NA	NA	NA	K35 EGR Sol Cntrl
36	K36 Wastegate Sol Cntrl	K36 Wastegate Sol Cntrl	NA	G24 Ser Reminder Indicator (DRI) Driver
37	NA	NA	NA	NA
38	NA	NA	NA	NA
39	K39 AIS #3 Driver	K39 AIS #3 Driver	K39 AIS #3 Driver	K39 AIS #3 Driver
40	K40 AIS #1 Driver	K40 AIS #1 Driver	K40 AIS #1 Driver	K40 AIS #1 Driver
41	K41 O2 Sens Sig	K41 O2 Sens Sig	K41 O2 Sens Sig	K41 O2 Sens Sig
42	K42 Knock Sen Sig	K42 Knock Sen Sig	K42 Knock Sen Sig	NA
43	G21 Tach Sig	G21 Tach Sig	G21 Tach Sig	NA
44	K44 Cam Pos Sens Sig	K44 Cam Pos Sens Sig	K44 Cam Pos Sens Sig	NA
45	D20 SCI Recv	D20 SCI Recv	D20 SCI Recv	D20 SCI Recv
46	D2 CCD Bus-	D2 CCD Bus-	D2 CCD Bus-	D2 CCD Bus-
47	G7 Vehicle Spd Sens Sig	G7 Vehicle Spd Sens Sig	G7 Vehicle Spd Sens Sig	G7 Vehicle Spd Sens Sig
48	V31 Spd Cntrl SET Sw	NA	NA	NA
49	V32 Spd Cntrl ON/OFF Sw	NA	NA	NA
50	V32 Spd Cntrl RESUME Sw	NA	NA	NA
51	K51 ASD Relay Cntrl	K51 ASD Relay Cntrl	K51 ASD Relay Cntrl	K51 ASD Relay Cntrl
52	K52 Purge Relay Cntrl	K52 Purge Relay Cntrl	K52 Purge Relay Cntrl	K52 Purge Relay Cntrl
53	V35 Spd Cntrl Vent Sol Cntrl	V35 Spd Cntrl Vent Sol Cntrl	V35 Spd Cntrl Vent Sol Cntrl	V35 Spd Cntrl Vent Sol Cntrl
54	K54 TCC Sol Cntrl	K54 TCC Sol Cntrl	K54 TCC Sol Cntrl	K54 TCC Sol Cntrl
55	K55 Baro Sol Cntrl	K55 Baro Sol Cntrl	NA	C27 Hi Spd Rad Fan Relay Cntrl
56	NA	NA	NA	NA
57	NA	A142 ASD // Inj-Sens // Alt Feed	A142 ASD // Inj-Sens // Alt Feed	A142 ASD // Inj-Sens // Alt Feed
58	NA	NA	NA	NA
59	K59 AIS #4 Driver	K59 AIS #4 Driver	K59 AIS #4 Driver	K59 AIS #4 Driver
60	K60 AIS #2 Driver	K60 AIS #2 Driver	K60 AIS #2 Driver	K60 AIS #2 Driver