160 20 byte datastream???
Thread Starter
Senior Member
Joined: Sep 2004
Posts: 952
Likes: 6
From: PITTSBURGH, PA
Car: 85 IROC-Z Z-28, BLUE & SILVER
Engine: 5.7L & 5.0L
Transmission: 700R4
Axle/Gears: FACTORY
160 20 byte datastream???
can someone please tell me what bytes the 160 (85' ecm) xmits?? i was able to write a program to pull the bytes but i have no idea what their for...
i did a search and read alot of threads but nothing definite...
the first byte i think is 0111 1111 or 1111 1111 (0xff) then the rest spit out..
so for example, is byte #2 tps, temp, mph, etc and so on...
i just need to know the order of what im recieving so i can convert the binary to a decimal format, thanx
i did a search and read alot of threads but nothing definite...
the first byte i think is 0111 1111 or 1111 1111 (0xff) then the rest spit out..
so for example, is byte #2 tps, temp, mph, etc and so on...
i just need to know the order of what im recieving so i can convert the binary to a decimal format, thanx
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Re: 160 20 byte datastream???
Code:
DATA STREAM A20 SPECIFICATION
ENGINE USAGE:
2.8l MFI (LB6) - (W) - 85, 86
2.8l MFI (LB8) - (S) - 86, 87, 88, 89
5.0l MFI (LB9) - (F) - 85
DATA PIN : READ DATA ON PIN "E" OF ALDL CONNECTOR
BAUD RATE : 160 BAUD
MODES : DIAGNOSTIC ENABLE:
MODULATED . . . . NO
10K . . . . . . . YES - 25 WORDS
NORMAL . . . . . YES - 8 WORDS
SHORTED . . . . . YES - 25 WORDS
DEFINITION: ALL DATA STREAMS CONTAIN THE SAME INFORMATION
IN THE SAME FORMAT
DATA STREAM DEFINITION
----------------------
WHERE "WORD" IS THE BYTE OF DATA STREAM AS IT IS READ FROM THE VEHICLE
AND "BIT" IS THE BIT OF THE BYTE, WHERE 0 IS THE LEAST SIGNIFICANT BIT.
WORD BIT DESCRIPTION
1 MODE WORD 2
0 ROAD SPEED PULSE OCCURRED 1 = PULSE OCCURRED
1 ESC FAILURE
2 REFERENCE PULSE OCCURRED 1 = PULSE OCCURRED
3 DIAGNOSTIC SWITCH IN FACTORY TEST 1 = 3.9K MODE
4 DIAGNOSTIC SWITCH IN DIAGNOSTIC POSITION 1 = SHORTED MODE
5 DIAGNOSTIC SWITCH IN ALDL POSITION 1 = 10K MODE
6 HIGH BATTERY VOLTAGE 1 = HIGH VOLTAGE
7 AIR METER PULSE OCCURRED
2 FIRST PROM ID WORD
3 SECOND PROM ID WORD
4 IAC PRESENT MOTOR POSITION
5 COOLANT TEMPERATURE A/D COUNTS
6 FILTERED MPH VARIABLE - VEHICLE SPEED
7 EGR DUTY CYCLE
8 ENGINE SPEED
9 THROTTLE POSITION SENSOR
10 BASE PULSE CLOSED LOOP CORRECTION
11 OXYGEN SENSOR
12 MALFUNCTION FLAG WORD 1
0 C24 VEHICLE SPEED SENSOR
1 C23 MANIFOLD AIR TEMPERATURE LOW
2 C22 THROTTLE POSITION SENSOR LOW
3 C21 THROTTLE POSITION SENSOR HIGH
4 C15 COOLANT SENSOR LOW TEMPERATURE
5 C14 COOLANT SENSOR HIGH TEMPERATURE
6 C13 OXYGEN SENSOR OPEN
7 C12 NO REFERENCE PULSES (ENG. NOT RUNNING)
13 MALFUNCTION FLAG WORD 2
0 C42 EST MONITOR ERROR
1 C41 CYLINDER SELECT ERROR
2 NOT USED
3 C34 MAF SENSOR LOW
4 C33 MAF SENSOR HIGH
5 C32 EXHAUST GAS RECIRCULATION FAILURE
6 NOT USED
7 C25 MANIFOLD AIR TEMPERATURE HIGH
14 MALFUNCTION FLAG WORD 3
0 C55 ADU ERROR
1 C54 FUEL PUMP VOLTAGE
2 C53 HIGH BATTERY VOLTAGE
3 C52 CAL PACK MISSING
4 C51 PROM ERROR
5 C45 OXYGEN SENSOR RICH
6 C44 OXYGEN SENSOR LEAN
7 C43 ELECTRONIC SPARK CONTROL FAILURE
WORD BIT DESCRIPTION
15 AIR-FUEL (A/F) MODE WORD
0 FOURTH TPS FORCED O/D DISABLE
1 LEARN CONTROL ENABLE FLAG 1 = ENABLE
2 LOW BATTERY VOLTAGE 1 = LOW BATTERY
3 PROP STEP TAKEN FLAG 1 = RICH
4 VEHICLE SPEED SENSOR FAILURE
5 EECC SLOW O2 RICH/LEAN FLAG
6 RICH LEAN FLAG 1 = RICH 0 = LEAN
7 CLOSED LOOP FLAG 1 = CLOSED LOOP 0 = OPEN
16 MANIFOLD AIR TEMPERATURE
17 MCU INPUT STATUS WORD
0 PARK/NEUTRAL 1 = PARK 0 = DRIVE
1 FAN REQUEST 1 = NO/OFF 0 = YES/ON
2 TCC LOCKED OR OVER DRIVE ENABLED 1 = ENABLE
3 EXCESSIVE POWER STEERING PRESSURE
4 100 MSEC OLD 4TH GEAR (SET/CLEARED IN TCC)
5 NOT IN 3RD GEAR 1 = NOT IN 3RD
6 4TH GEAR SWITCH CLOSED 1 = NOT IN 4TH 0 = IN 4TH GEAR
7 A/C REQUESTED 1 = NO 0 = A/C REQUESTED
18 LOAD VARIABLE
19 BLOCK LEARN MULTIPLIER
20 ALDL RICH LEAN CHANGE COUNTER / TOTAL CROSSOVER COUNTS
21 UNLIMITED SPARK ADVANCE (not used)
22 MASS AIR FLOW RATE BYTE #1 (MAF)
23 MASS AIR FLOW RATE BYTE #2 (MAF)
24 BASE PULSE WIDTH BYTE #1
25 BASE PULSE WIDTH BYTE #2
CONVERSION FOR A/D COUNTS TO ENGINEERING UNITS
----------------------------------------------
N = A/D COUNTS
EU = ENGINEERING UNITS
EU = N*A + B
EU =
EU = N
EU = TABLE LOOKUP
ENGINEERING
WORD DESCRIPTION CONVERSION UNIT
1 MODE WORD 2 NONE
2 FIRST PROM ID WORD NONE
3 SECOND PROM ID WORD NONE
4 IAC NONE
5 COOLANT TEMPERATURE SEE TABLES DEGREES C
6 VEHICLE SPEED NONE
7 EGR DUTY CYCLE EU = N/2.56 % DUTY CYCLE
8 RPM EU = N*25 RPM
9 THROTTLE POSITION EU = N*.0196 VOLTS
10 BASE PULSE CLOSED LOOP CORRECTION NONE
11 OXYGEN SENSOR EU = N*4.44 MILLIVOLTS
12 MALF FLAG WORD 1 NONE
13 MALF FLAG WORD 2 NONE
14 MALF FLAG WORD 3 NONE
15 FUEL-AIR MODE WORD NONE
16 MANIFOLD AIR TEMPERATURE TABLE LOOKUP
17 MCU INPUT STATUS WORD NONE
18 LOAD VARIABLE
19 BLOCK LEARN MULTIPLIER NONE
20 ALDL RICH LEAN CHANGE COUNTER SEE **
21 UNLIMITED SPARK ADVANCE Not used !
22 MASS AIR FLOW RATE BYTE #1
23 MASS AIR FLOW RATE BYTE #2
24 BASE PULSE WIDTH BYTE #1
25 BASE PULSE WIDTH BYTE #2 EU =(BYTE1*256+BYTE2)*.0153 *** MS
** : THIS IS A ROLLOVER COUNTER (0 - 255), TAKE CURRENT DATA STREAM READING
SUBTRACT LAST DATA STREAM READING = CROSSCOUNTS. IF CURRENT READING
MINUS LAST READING IS < 0, THEN TAKE CURRENT READING + 255 - LAST
READING = CROSSCOUNTS.
***: THIS READING SHOULD BE THE DIFFERENCE BETWEEN THE LAST TWO READINGS.
TAKE CURRENT DATA STREAM READING SUBTRACT LAST DATA STREAM READING FOR
ACTUAL MS VALUE. FOR FIRST DATA STREAM, THAT READING IS THE MS VALUE. RBob.
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iTrader: (1)
Joined: Mar 2002
Posts: 18,432
Likes: 234
From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Re: 160 20 byte datastream???
Here is the conversion chart for the IAT/MAT. Not sure if it will work with the CTS. If the CTS ADC changes abruptly at a particular temperature then it uses dual pull ups. It will be difficult to know the actual coolant temperature.
RBob.
Code:
AIR TEMPERATURE SENSOR TABLE
DEGREES C A/D COUNTS
------------ -----------
-40 0
-30 4
-25 5
-20 8
-15 10
-10 14
- 5 18
0 24
5 30
10 37
15 46
20 56
25 66
30 78
35 90
40 103
45 116
50 129
55 141
60 153
65 163
70 174
75 183
80 191
85 199
90 295
95 211
100 216
105 221
110 225
115 229
120 232
125 234
130 237
135 239
140 241
145 241
150 243
200 255 Thread Starter
Senior Member
Joined: Sep 2004
Posts: 952
Likes: 6
From: PITTSBURGH, PA
Car: 85 IROC-Z Z-28, BLUE & SILVER
Engine: 5.7L & 5.0L
Transmission: 700R4
Axle/Gears: FACTORY
Re: 160 20 byte datastream???
sweeeet!!!!!!!!!
do have it for the 8192??? its for my 2nd iroc-z, 1988 tpi 350
do have it for the 8192??? its for my 2nd iroc-z, 1988 tpi 350
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Thread Starter
Senior Member
Joined: Sep 2004
Posts: 952
Likes: 6
From: PITTSBURGH, PA
Car: 85 IROC-Z Z-28, BLUE & SILVER
Engine: 5.7L & 5.0L
Transmission: 700R4
Axle/Gears: FACTORY
Re: 160 20 byte datastream???
what mode do i use when the car is running for live data?
10k, 3.9k or jumpered??
10k, 3.9k or jumpered??
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