3S-FE ecu
Contents |
[edit] ECU
Below are some details about the ECU on the 3S-FE engine in an Australian 1989 SV21 Camry.
Toyota Part No. 89661-32222
Denso Part No. 175000-2321
[edit] Pinout
The Connector is in three blocks:
10 pins - 18 pins - 14 pins
E02 E01
- 20 #10
IGT STA
E1 VF
--- NSW
ISC2 ISC1
R/P W
ACT T
A/C IDL
E2 IGF
OX G-
--- G1
VTA HT
THW NE
ECT L3
L2 L1
E21 VC
STP VS
SPD THA
ELS BATT
+B +B1
[edit] Major chips in the ECU
|
Designator |
Marking |
Package |
Pitch |
Width |
Notes |
| IC101 | D HC284 | SIP-10 | 100 | Regulator / Power control | |
| IC201 | D HC165 | SIP-14 | 100 | Drivers ?? | |
| IC211 | TOSHIBA TC4069UBP | DIP-14 | 100 | 300 | Hex inverters |
| IC301 | D 151821-0020 | DIP-24 | 70 | 300 | ???? |
| IC401 | D 949577-2100 | DIP-22 | 100 | 400 | Analog to Digital converter |
| IC501 | D 151801-9690 | DIP-42 | 100 | 600 | Processor |
| IC502 | TOSHIBA TD62504P | DIP-16 | 100 | 300 | 7 * Open collector drivers |
| IC901 | ND MF169 | DIP-20 | 100 | 400 | ???? |
[edit] Chip markings
The extra characters are likely date or batch codes.
IC101: D HC284 4J19 (Vertical big block)
IC201: D HC165 4J14 (Vertical big block)
IC211: TOSHIBA 8914HB TC4069UBP JAPAN
IC301: D151821-0020 908CV
IC401: D949577-2100 3894 9c2149
IC501: D 151801-9690 7616-2053 9C1491
IC502: TOSHIBA JAPAN TD62504P 8910k
IC901: ND MF169 4J07A
[edit] Circuit Operation
The processor, IC501, is powered at all times. When the igntion switch is off, it is powered by ~4.7V provided by IC101 (HC284). When the ignition is on, the rail increases to 5.0V.
A PNP power transistor (T101 - a B1015) regulates the 12V B+ line down to the internal 5V regulated rail. Base drive current for this transistor is provided by IC101.
The input signals THW, THA, VS, VTA, B+ are filtered, clamped and passed to IC401 for A/D conversion. IC401 connects via 4 pins to the processor. These presumably run some sort of serial interface (eg SPI) for passing the converted analog values to the processor.
