Ecu hw

From Nissan ECU RE

ECU hardware information[edit]

Attempting to collect knowledge about different hardware revisions of these ECUs. It would be interesting to correlate the actual hardware (PCB layout, mcu type) with the outside markings and ECUID. I've grouped these by arbiratry type letters which have nothing to do (yet) with markings. [TODO - make a table out of this ]

Single microcontroller types[edit]

type A[edit]

  • SH7058 (probably never SH7058S)
  • ECUIDs : CF43D (MY06 350Z USDM), 6Z68A (MY03 QG18DE Sentra CAN)
  • Outside markings :
    • CF43D: "LP" and "MEC60-122 A1 6331"
    • 6Z68A: "0 N" and MEC63-161 A1"


ICs[edit]

  • 93C66 : EEPROM (256*16bit SPI)
  • L9762 : all-in-one mess, with voltage regulators, CAN + K transceivers, unknown other stuff
  • 789101 : mask-ROM mcu, seems to be mainly a supervisor / reset controller. See ext watchdog signal
  • misc : some "sub-versions" may have unpopulated IC footprints.

wiring, pinouts, schem[edit]

  • Connections to 93C66:
  CS=193CPU (PJ15)
  SK=192CPU (PJ14)
  DI=191CPU (PJ13)
  DO=190 (PJ12)
  ORG=VCC ( => EEPROM is wired as 256 * 16bit )
  • mcu mode pin connections:
  MD2 VCC
  MD1 3.3k to MD0/FWE
  MD0 : direct connect to FWE
  FWE : VCC
  • Clocking : xtal = 10MHz, peripheral clock most probably 20MHz
  • K line transceiver is connected to SCI1_TX and _RX pins (165, 166 CPU)
  • WDT signal : 250Hz (2ms high, 2ms low) is output from cpu pin PL5
  • Testpoints (TP) on the back of the PCB : 2 groups of 6 TPs;
  • TP group A:
    • 1,2 VBat
    • 3,4 GND
    • 5 +5V
    • 6 N/C ?
  • TP group B:
    • 162CPU (PB14) = ?
    • 165CPU (PC0/SCI1_TX) => K
    • 55CPU (MD1)
    • 166CPU (PC1/SCI1_RX) => K
    • 221CPU (PL5) via 1kR => WDT
    • 58CPU (nRES), 3k pullup to PVCC2 ? (mesured)

pix[edit]

  • "type A" PCB, ECUID=CF43D

    "type A" PCB, ECUID=CF43D

  • "type A" testpoints

    "type A" testpoints

  • "type A" PCB, ECUID=6Z68A

    "type A" PCB, ECUID=6Z68A

type B[edit]

Seems to be a more compact PCB ? And the mcu is mounted 180deg when compared with type A ECUs.

  • SH7055
  • ECUIDs : EQ910 (MY05 Xtrail AUS)
  • Outside markings :
    • EQ910: ?

ICs[edit]

Probably the same population as type A ?

wiring, pinouts, schem[edit]

  • EEPROM : unknown type, but firmware spi_* functions are mostly identical to type A. Connected to the same PORTJ pins as type A.

pix[edit]

"type B" PCB; ECUID=EQ910

type C[edit]

Probably same size PCB as type A. "upside down" mcu, like type B.

  • SH7058
  • ECUIDs : ZD89A (MY06 Altima USDM)
  • Outside markings :
    • ZD89A: "63" and "MEC85-521 A1 5913"

ICs[edit]

Probably the same population as type A ?

pix[edit]

  • "type C" PCB; ECUID=ZD89A

    "type C" PCB; ECUID=ZD89A

  • PCB testpoints, ZD89A

    PCB testpoints, ZD89A

type D[edit]

  • SH7055 0.18μ
  • ECUIDs : EC80A, EC82A, EC87A, EM63A : all HR16DE ECUs

pix[edit]

Open images at full size to see IC definitions and connection pad names

  • EC87A, top

    EC87A, top

  • EC87A, bottom

    EC87A, bottom

ICs[edit]

EEPROM is M95320 SPI IC
CAN transiever is TLE 6250 G

wiring, pinouts, schem[edit]

ECU dissasembling confirmed findings in disassembly of the ROMs indicating that the EEPROM is on PORTC, unlike the types A,B,C: 

	CK - SCK2 (pin 164)
	DI - TXD2 (pin 167)
	DO - RXD2 (pin 168)
	CS - PC4 (pin 169)

as observed by Shuher @ RR based on EC87A disasm. Note that the code uses the SCI2 peripheral instead of bitbanging the SPI proto.


Some useful ECU's main connector pins

  • ECU pinout

    ECU pinout 

	+12V BAT - 105
        +12V IGN - 93
	GND - 108
	CANL - 83
	CANH - 84
	K-Line - 88

ECU pins to CPU ports connections

Inputs:

ECU pin CPU port (SH7055) Signal Description
61 PA0 / TI0A POS Crankshaft position sensor
65 PA8 / TIO4A CAM Camshaft position sensor
45 AN4 MAF Mass airflow sensor
46 AN29 IAT Intake air temperature sensor
33 AN22 THRTL1 Throttle position sensor 1
34 AN20 THRTL2 Throttle position sensor 2
110 AN8 APS1 Accelerator position sensor 1
103 AN21 APS2 Accelerator position sensor 2
37 AN25 KNOCK Knock sensor input

Outputs:

ECU pin CPU port (SH7055) Signal Description
4 PB1 THRTL_CLOSE Throttle actuator
1 PB0 THRTL_OPEN Throttle actuator
73 PB6 VVT_VALVE VVT control solenoid
31 PK0 INJ1 Fuel injector 1
30 PK1 INJ2 Fuel injector 2
29 PK2 INJ3 Fuel injector 3
25 PK3 INJ4 Fuel injector 4
17 PD8 IGN1 Ignition coil 1
18 PD9 IGN2 Ignition coil 2
22 PD10 IGN3 Ignition coil 3
21 PD11 IGN4 Ignition coil 4

type F[edit]

  • SH7055 0.35μ
  • ECUIDs : AU40B (MY2002 QR20DE); 8U023 (MY02 Sentra QR25DE)

pix[edit]

  • AU40B, top

    AU40B, top

  • AU40B, bottom

    AU40B, bottom

ICs[edit]

EEPROM is 93C66 SPI IC

wiring, pinouts, schem[edit]

EEPROM: 

CS - PJ15 (pin 193)
CK - PJ14 (pin 192)
DI - PJ13 (pin 191)
DO - PJ12 (pin 190)

Some useful ECU's main connector pins

  • ECU pinout

    ECU pinout 

	+12V BAT - 109, 111
        +12V IGN - 42
	GND - 106, 108
	CANL - 34
	CANH - 33
	K-Line - 50

misc types[edit]

Some other PCB examples that are not similar enough to other types to fit in their categories. Some of these probably deserve their own "type" section when someone documents them enough.

  • Altima 2011, 9HA7A/9HA7D

    Altima 2011, 9HA7A/9HA7D

  • Altima 2011, 9HA7A/9HA7D

    Altima 2011, 9HA7A/9HA7D

Dual-microcontroller types[edit]

type E[edit]

  • Two SH7051 mcus
  • Outside markings :
    • AG920 (Y34 Gloria) : Q2, A56-M43 N01 9716 , UNISIA JECS
    • 2Y967 (A33 Maxima MY00): AB, A56-P35 Z46 9X22, UNISIA JECS

ICs[edit]

  • One or two 93C56 EEPROMs

pics[edit]

  • "type E" PCB, ECUID=AG920

    "type E" PCB, ECUID=AG920

  • "type E" PCB, ECUID=AG920

    "type E" PCB, ECUID=AG920

wiring, pinouts, schem[edit]

Some useful ECU main connector pins. Note, the same connector is used on many different ECUs and sometimes the pinouts may vary. Check the service manual to confirm !

  • ECU pinout

    ECU pinout 

These pinouts are verified on 2Y967 (00 Maxima) and 4M860 (01 Sentra)

43	IGN
106, 108	ECM GND
110, 112	ECM B+
115	K line
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