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/06/28/93 PUT DATA STREAM INFORMATION IN FILE. B.HENSON


DATA STREAM A28 SPECIFICATION

ENGINE USAGE:
5.0L PFI CPC - (LB9) - (F) - 87,88 (160 & 8192 baud)
5.0L PFI CPC - (LB9) - (F) - 86 (160 baud only)
5.7L PFI CPC - (L98) - (8) - 87,88 (160 & 8192 baud)
5.7L PFI CPC - (L98) - (8) - 85,86 (160 baud only)

DATA PIN : READ DATA ON PIN "E" OF ALDL CONNECTOR

BAUD RATE : 8192

MODES : DATA STREAM ATTACHED FOR ALDL MODE 1

THESE ENGINES USE A 'HYBRID' ECM, AND THE 8192 DATA
COMMUNICATIONS OCCUR ON ALDL PIN 'E'
Serial data shall be unidirectional from the ECM to a connected
device at 160 baud when the ECM is not in the ALDL mode. When the
ECM is in the ALDL mode (10k), the ECM shall transmit the normal
25 parameter ALDL list at the 160 baud rate. The ECM shall then
be moded to listen for a period of 50 ms for an inbound message
from an ALDL test device at an 8192 baud rate. If a valid message
is received, communications shall continue at an 8192 baud rate
until a power down reset. Otherwise, the ECM shall be moded for
160 baud, transmit the 25 parameter ALDL list and then listen for
50 ms for an 8192 baud inbound message.
------------------------------------------------------------

DATA PIN : READ DATA ON PIN "E" OF ALDL CONNECTOR

BAUD RATE : 160

MODES : 10 K MODE OR SHORTED
..PAGE
..HEAD02L ALDL DATA LIST
..HEAD03L NUMBER OF DATA WORDS - 25
..HEAD04L ALDL 160 BAUD: 10K AND SHORTED MODES
..HEAD05L WORD BIT LOCATION

1 MODE WORD 2
0 OVERDRIVE ON 1 = ON, 0 = OFF
1 MALF 14 OR 15 THIS STARTUP
2 REFERENCE PULSE OCCUREED
3 1 = IN ALDL MODE, 8192 LOCKED IN , AND MODE 4
4 DIAGNOSTIC SWITCH IN DIAGNOSTIC POSITION
5 DIAGNOSTIC SWITCH IN ALDL POSITION
6 HIGH BATTERY VOLTAGE
7 SHIFT LIGHT 1 = ON, 0 = OFF
2 FIRST PROMID WORD PROMID = (MSB)*256+(LSB)
3 SECOND PROMID WORD
4 IAC PRESENT MOTOR POSITION STEPS = N
5 COOLANT TEMPERATURE DEG C = N*192/256 - 40
6 MILES PER HOUR N = MPH
7 EGR DUTY CYCLE % DUTY CYCLE = N/2.56
8 ENGINE SPEED (RPM) RPM = N * 25
9 THROTTLE POSITION VOLTS = N * .0196
10 BASE PULSE CLOSED LOOP CORRECTION N = COUNTS
11 OXYGEN SENSOR MILLIVOLTS = N*4.44
12 MALFUNCTION FLAG WORD 1
0 C23 MAT SENSOR LOW
1 C22 THROTTLE POSITION SENSOR LOW
2 C21 THROTTLE POSITION SENSOR HIGH
3 C16 NOT USED
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 C35 NOT USED
1 C34 MAF SENSOR LOW
2 C33 MAF SENSOR HIGH
3 C32 EGR DIAGNOSTIC
4 C31 NOT USED
5 C26 NOT USED
6 C25 MAT SENSOR HIGH
7 C24 VEHICLE SPEED SENSOR
14 MALFUNCTION FLAG WORD 3
0 C51 PROM ERROR
1 C46 VATS FAILED
2 C45 OXYGEN SENSOR RICH
3 C44 OXYGEN SENSOR LEAN
4 C43 ESC FAILURE
5 C42 EST MONITOR ERROR
6 C41 CYLINDER SELECT ERROR
7 C36 BURNOFF DIAGNOSTIC
..PAGE
15 MALF FLAG WORD 4
0 C63 NOT USED
1 C62 NOT USED
2 C61 NOT USED
3 C56 NOT USED
4 C54 ADU ERROR
5 C53 FUEL PUMP VOLTAGE
6 C52 OVER VOLTAGE
7 C51 CAL PACK MISSING
16 AIR/FUEL MODE WORD
0 NOT USED
1 LEARN CONTROL ENABLE FLAG 1 = ENABLE STORED
2 NOT USED
3 NOT USED
4 VEHICLE SPEED SENSOR FAILURE
5 EECC SLOW 02 RICH/LEAN FLAG
6 RICH - LEAN FLAG 1 = RICH, 0 = LEAN
7 CLOSED LOOP FLAG 1 = CLOSED LOOP
17 MANIFOLD AIR TEMPERATURE SEE TABLE 1
18 MCU INPUT STATUS WORD
0 1 = IN PARK/NEUTRAL
1 1 = NOT IN THIRD GEAR
2 1 = OVERDRIVE REQUEST
3 NOT USED(POWER STEERING ON = 1)
4 1 = EGR DIAGNOSTIC SWITCH CLOSED
5 1 = TCC LOCKED
6 1 = FAN REQUEST BIT
7 0 = A/C REQUEST
19 OLDPA3 - ESC COUNTER INPUT N = COUNTS
20 BLM N = COUNTS
21 ALDL RICH LEAN CHANGE COUNTER / TOTAL CROSSOVER COUNTS **
22 AIR FLOW RATE (MSB)
23 AIR FLOW RATE (LSB) G/S = (MSB)*256+(LSB)
24 INJECTOR BASE PULSE WIDTH (MSB)
25 INJECTOR BASE PULSE WIDTH (LSB) WIDTH=(MSB)*256 + (LSB)
***: 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.



** : 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.
..PAGE
..HEAD02L ALDL DATA LIST
..HEAD03L
..HEAD04L
..HEAD05L

MANIFOLD AIR TEMPERATURE TABLE

DEGREES C A/D
TEMPERATURE 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
90 205
95 211
100 216
105 221
110 225
115 229
120 232
125 234
130 237
135 239
140 241
145 242
150 243
200 255
..PAGE
..HEAD02L
..HEAD03L 8192 BAUD COMMUNICATIONS.
..HEAD04L ALDL 8192 BAUD: 10K AND SHORTED MODES - MODE 1
..HEAD05L


The ALDL tester must transmit the following message to the ECM,
to receive the fixed data stream:

MODE 1 (TRANSMIT FIXED DATA STREAM)
ALDL REQUEST:
- MESSAGE ID = $80
- MESSAGE LENGTH = $56
- MODE = $01
- SUM CHECK

THE ECM WILL RESPOND WITH THE FOLLOWING MESSAGE:
- MESSAGE ID = $80
- MESSAGE LENGTH = $95
- MODE = $01
- DATA BYTE 1
.
.
- DATA BYTE 63
- SUM CHECK

..HEAD02L ALDL DATA LIST
..HEAD03L NUMBER OF DATA WORDS - 63
..HEAD04L ALDL MODE 1: 10K AND SHORTED MODES
..HEAD05L WORD BIT LOCATION
..page

WORD BIT DESCRIPTION EQUATION
1 PROMIDA (MSB)
2 PROMIDB (LSB) PROM = (N1*256+N2)
3 MALFUNCTION WORD 1
0 MALF CODE 23 MAT SENSOR OPEN
1 MALF CODE 22 THROTTLE POSITION LOW
2 MALF CODE 21 THROTTLE POSITION HIGH
3 MALF CODE 16 NOT USED
4 MALF CODE 15 COOLANT SENSOR LOW
5 MALF CODE 14 COOLANT SENSOR HIGH
6 MALF CODE 13 OXYGEN SENSOR
7 MALF CODE 12 NO REFERENCE PULSES
4 MALFUNCTION WORD 2
0 MALF CODE 35 NOT USED
1 MALF CODE 34 MAF SENSOR LOW
2 MALF CODE 33 MAF SENSOR HIGH
3 MALF CODE 32 EGR
4 MALF CODE 31 NOT USED
5 MALF CODE 26 NOT USED
6 MALF CODE 25 MAT SENSOR HI
7 MALF CODE 24 VEHICLE SPEED SENSOR
5 MALFUNCTION WORD 3
4 MALF CODE 51 PROM ERROR
5 MALF CODE 46 VATS FAILED
5 MALF CODE 45 O2 SENSOR RICH
6 MALF CODE 44 O2 SENSOR LEAN
7 MALF CODE 43 ESC FAILURE
5 MALF CODE 42 EST MONITOR ERROR
5 MALF CODE 41 CYLINDER SELECT
5 MALF CODE 36 BURNOFF DIAGNOSTICS
6 MALFUNCTION WORD 4
0 (CODE 63)
1 (CODE 62)
2 (CODE 61)
3 (CODE 56)
4 (CODE 55)
5 MALF CODE 54 FUEL PUMP VOLTAGE
6 MALF CODE 53 OVER VOLTAGE
7 MALF CODE 52 CAL PACK MISSING
7 MALFUNCTION WORD 5
0 (CODE 63)
1 (CODE 62)
2 (CODE 61)
3 (CODE 56)
4 (CODE 55)
5 MALF CODE 66 NOT USED
6 MALF CODE 65 NOT USED
7 MALF CODE 64 NOT USED
8 COOLANT TEMPERATURE N = (DEG C + 40)*256/192
9 START UP COOLANT TEMPERATURE N = (DEGC + 40)*256/192
10 THROTTLE POSITION VOLTS = N/51
11 ENGINE SPEED RPM = N*25
12 TIME BETWEEN REFERENCE PULSES (MSB)
13 TIME BETWEEN REFERENCE PULSES (LSB) USEC=(N15*256+N16)*15.26
14 FILTERED MILES PER HOUR (MSB)
15 FILTERED MILES PER HOUR (LSB)
16 N/V RATIO
17 OXYGEN SENSOR MILLIVOLTS = N*4.44
18 O2 CROSS COUNTS
19 BASE PULSE FINE CORRECTION
20 BASE PULSE COURSE CORRECTION(BLM)
21 BLOCK LEARN MULTIPLIER CELL N = BLM CELL #
22 CLOSED LOOP INTEGRATOR
23 IAC MOTOR POSITION N = # IAC STEPS
24 IDLE SPEED STEPS COMMAND, DIRECTION 0<N<128 N = # STEPS
128<N<256 N = #STEPS +128
25 DESIRED IDLE RPM RPM = N*12.5
26 LOAD VARIABLE AIRFLOW * RPM
27 AD TEST CHANNEL GOOD RANG 118-137
28 LOAD VARIABLE 12.5 MSEC OLD
29 MANIFOLD ABSOLUTE PRESSURE VOLTS = N * .0196
30 AIR TEMPERATURE SENSOR SEE TABLE #1
31 EGR DUTY CYCLE % DUTY CYCLE = N/2.56
32 CHARCOAL CANISTER PURGE DUTY CYCLE
33 ENGINE COOLING FAN DUTY CYCLE
34 BATTERY VOLTAGE VOLTS = N/10
35 FUEL PUMP POWER SWITCH SUPPLIED
36 MASS AIR FLOW (MSB)
37 MASS AIR FLOW (LSB)
38 MASS AIR FLOW (LSB)
39 TOTAL UNLIMITED SPARK ADVANCE REL TO TDC (MSB)
40 TOTAL UNLIMITED SPARK ADVANCE REL TO TDC (LSB)
double byte value in 2's complement representation
If Bit 7 of MSB = 0 then result is positive
value = (N38*256 + N39)
If Bit 7 of MSB = 1 then result is negative
value = 65536 - (N38*256 + N39)
DEGREES = value * 90/256
41 UNLIMITED SPARK ADVANCE REL TO REF PULSE(MSB)
42 UNLIMITED SPARK ADVANCE REL TO REF PULSE(LSB)
DEGREES = value * 90/256
43 ELECTRONIC SPARK CONTROL SIGNAL INPUT
44 ELECTRONIC SPARK CONTROL ECM OUTPUT
45 INJECTOR BASE PULSE WIDTH (MSB)
46 INJECTOR BASE PULSE WIDTH (LSB)
47 TOTAL FUEL AIR VALUE(MSB)
48 TOTAL FUEL AIR VALUE(LSB)
49 RUNNING TOTAL OF FUEL DELIVERED(MSB)
50 RUNNING TOTAL OF FUEL DELIVERED(LSB)
51 RUNNING TOTAL OF DISTANCE TRAVELED
52 ENGINE RUNNING TIME IN SECONDS (MSB)
53 ENGINE RUNNING TIME IN SECONDS (LSB)
54 MODE WORD 2
0 1 = CARS ACTIVE
1 MALF 14 OR 15 THIS START UP
2 REFERENCE PULSE OCCURRED
3 1 = IN ALDL MODE 8192 LOCKED IN AND MODE 4
4 DIAGNOSTIC SWITCH IN DIAG POSITION
5 DIAGNOSTIC SWITCH IN ALDL POSITION
6 HIGH BATTERY VOLTAGE-DISABLE MCU SOL DISABLE
7 SHIFT LIGHT (1 = ON, 0 = OFF)_
55 MCUINST
0 1 = PARK/NEUTRAL
1 1 = NOT IN 3RD GEAR
2 1 = OVERDRIVE REQUREST
3 NOT USED(1 = POWER STEERING PRESSURE)
4 NOT USED
5 1 = TRANS CONVERTER CLUTCH LOCKED
6 1 = FAN RUEQUEST
7 0 = AIR CONDITIOINING REQUEST
..PAGE
56 FMDBYTE 1
0 PARK NEUTRAL SWITCH 0=DRIVE
1 3RD GEAR = 1
2 4TH GEAR = 1
3 NOT USED(POWER STEERING CRAMP = 1)
4 NOT USED
5 EGR DIAGNOSTIC
6 FAN REQUEST <=> AIR CONDITIONING HI PRESSURE
7 AIR CONDITIONER 0 = A/C REQUESTED
57 MINOR LOOP MODE WORD 1
0 ADVANCE FLAG 0 = ADV
1 1 = HIGHWAY FUEL TIMER ENABLED
2 INTERRUPT SERVICE EXECUTION EXC 6.25
3 FAN ON DISABLESD BY PID
4 TCC ROAD SPEED 1ST PULSE FLAG
5 AIR CONDITIONING CLUTCH FLAG 0 = A/C CLUTCH ON
6 BYPASS CHECK ENABLE
7 ENGINE RUNNING FLAG 1 = RUNNING
58 NV MODE WORD
0 1 = 02 SENSOR READY
1 1 = CLOSED LOOP TIMER TIMED OUT
2 NOT USED
3 1 = IMPROPER SHUTDOWN
4 NOT USED
5 1 = IAC KICKDOWN ENABLED
6 1 = KWARM KICKDOWN ENABLED
7 1 = MALF 42 FAILED (EST MONITOR)
59 DNEE MODE WORD
0 OVERDRIVE ON 1 = ON
1 1ST GEAR DIRCT 1 = 1ST GEAR
2 1ST UPSHIFT OK 1 = OK
3 4TH GEAR 1 = 4TH GEAR
4 1ST GEAR OVERDRIVE 1 = OVERDRIVE
5 DOWNSHIFT/OFF REQUEST 1 = REQUEST
6 UPSHIFT/ON REQUEST 1 = REQUEST
7 OVERDRIVE ACTIVE 1 = ACTIVE
60 ALCL MODE WORD
0 ALDL RESET
1 1 = CLEAN CANISTER
2 1 = IN OPEN LOOP BEFORE GOINT INTO PE
3 FIRST C/L PASS THRU FIELD SERVICE MODE 1 = DONE
4 FIELD SERVICE
5 ONE SECOND FLAG
6 200 MSEC TOGGLE BIT FOR 2.5 HZ FLASH RATE
7 PULLUP RESISTOR FOR COOLANT 1 = 4K
61 AIR MODE WORD
0 100 ms old ccp purge on flag 0 = off
1 1 = AIR CONTROLLED 0 =AIR DIVERTED
2 1 = AIR SWITCHED TO PORT
3 1 = BURNOFF FAILURE CHECK COMPLETE
4 1 = SKIP BURNOFF DU TO > 17 VOLTS THIS START UP
5 1 = D.E. QSEQ
6 1 = BURN OFF AIR METER
7 1 = DECEL ENLEANMENT
..PAGE
62 SD MODE WORD
0 1 = EXPECTING FIRST 160 BAUD INTERRUPT
1 1 = EXPECTING SECOND 160 BAUD INTERRUPT
2 1 = IN 8192 MODE
3 1 = LOCKED IN 8192 MODE
4 1 = BLM RESET COMMANDED IN PRIOR LOOP
5 1 = IAC RESET COMMANDED IN PRIOR LOOP
6 1 = MALFFLAG CLEAR COMMAND IN PRIOR LOOP
7 NOT USED
63 MWAF1
0 NOT USED
1 LEARN CONTROL ENABLE FLAG 1 = ENABLE STORE
2 NOT USED
3 NOT USED
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 0 = OPEN