Z31 aircond sw

[bsdkllr]

is there anyway to reflash this at home. shipping stuff away currently is a bit tricky.

[Matt]

Shipping to/from Australia is almost impossible. Half the destinations (including USA/Canada) are not available for shipping via Australia Post

Suggest contacting Andy @ AutovaughnPerformance regarding reflashing. I'm working on the 1986 19P1F firmware again today to finish it up

[bsdkllr]

can i put a stock rom back in and run it without the 24 pin chip?

i'm having a really tough time getting anything to continue to work correctly on this. one day its working the next its not. the other day i couldn't touch the k value or it would stall. today i can adjust the k value. one day it idles fine the next its stumbling running lean. i have tried this with 3 different cars with almost the same outcome.

i don't know if its the oddball 86 ecu or just the cars just don't want to run.

as much as i wanted nistune to work im just out of options.

and to top it off it killed my wideband o2.

[Matt]

Yes you can plug in your original ROM chip. Don't need the 24 pin chip

[Matt]

The 1986 ECU using 1988 ECU firmware, doesn't really have an issue apart from the AC switch input so far

Got a 1986 Z31 VG30E ECU here for install, and found the neutral switch is not connected at all inside the ECU. There is a place marking for D73 which is the neutral switch diode. That is why that doesn't show up

Neutral with Z31 firmware operates on the 1986 RB30 ECUs (and works with the 19P1F firmware I've been working on) but not this VG30 ECU.

The fuel temp sensor is pin 15 which is not used on the RB30 ECUs (spare pin) but we reuse for launch control input in the 1988 FP firmware.

[Matt]

Also this 1986 VG30 ECU I'm not seeing any speed input (!) which is via D123. It's find on the RB30 ECU with Z31 19P1F firmware. I'm not sure why neutral and speed are removed from these non turbo ECU hardware variants

[Matt]

1988 26P0F firmware uses the Fuel Temp setting parameter to set the fuel temperature manually (normally the temp sensor sits in the regulator, and is used for additional enrichment)

[Matt]

1986 19P12 code does not use the fuel temp sensor it seems

Code: Select all

92CF : 86 06 		ldaa	#$06
92D1 : 8D 11 		bsr	L92E4
92D3 : 7D 00 FF 	tst	RAM_00FF_RAW_FUEL_TEMP_LOOKUP_VAL
92D6 : 26 02 		bne	L92DA
92D8 : 97 FF 		staa	RAM_00FF_RAW_FUEL_TEMP_LOOKUP_VAL
92DA : 97 07 		staa	RAM_0007_RAW_FUEL_TEMP_LOOKUP_VAL

Here we can see the 46510 chip AD input (#6) is saved to 0x00FF (fuel temp display on consult) and 0007

1988 26P00 code uses it

Code: Select all

9514 : 86 06 		ldaa	#$06
9516 : 8D 22 		bsr	SUB_953A_Read_AD_Input
9518 : 7D 00 FF 	tst	RAM_00FF_CONV_FUEL_TEMP_LOOKUP_VAL
951B : 26 0A 		bne	L9527
951D : 36 			psha
951E : CE BB 30 	ldx	#TEMP_CONV
9521 : BD 80 DD 	jsr	L80DD (interpolate routine)
9524 : 97 FF 		staa	RAM_00FF_CONV_FUEL_TEMP_LOOKUP_VAL
9526 : 32 			pula

Same thing as above, except the raw temp is converted using the temperature conversion table from raw to degrees C value

Both check the validity of the input, and raise a DTC (if not filtered)

Code: Select all

8D5E : 96 07 		ldaa	RAM_0007_LH_O2_VOLTAGE
8D60 : 81 02 		cmpa	#$02
8D62 : 23 0E 		bls	L8D72
8D64 : 81 F8 		cmpa	#$F8

R31 like 1986 Z31 doesn't use this input it seems (need service manual to double check). Pin 15 (Fuel temp) is not connected on Z31 looms

[bsdkllr]

Also this 1986 VG30 ECU I'm not seeing any speed input (!) which is via D123. It's find on the RB30 ECU with Z31 19P1F firmware. I'm not sure why neutral and speed are removed from these non turbo ECU hardware variants

the transmission for the non turbo z31 does not have provisions for a neutral switch. i have both non turbo and turbo ecu's and the non turbos are missing a few diodes in places.

and pin 15 is populated and goes to a fuel temperature sensor on the fuel pressure regulator.

i attached a diagram for 87 ecu's but 86 is wired identical with the exception of the check connector.

[bsdkllr]

is it safe to order the base image programmer now? is shipping coming through to the US now?

[Matt]

Yes shipping is about 2-3 weeks now. I've tested updated FP1.1 firmware on the VLT model, so just need to port that through to 26P00 and 19P12 ECU code now

[Matt]

Thanks for the diagram. So the Z31 also has AIV and EGR output solenoid valves too?

[bsdkllr]

Yes the 86 has aiv and egr valves.

[bsdkllr]

Also just noticed both diagnostics lights flash together. Not that it does anything. But I did not notice this with the non feature pack board.

[Matt]

FP reuses the diagnostic input for flex fuel. here is a diagnostic pot parameter you can adjust between closed loop and LED diagnostic code modes in the software