DATA STREAM A143 SPECIFICATION

SPECIFICATIONS FOR DATA STREAM INFORMATION

------------------------------------------

ENGINE USAGE:

3300 MFI (LG7) (VIN=N) 91 A,N-CAR

3300 MFI (LG7) (VIN=N) 92 3,4A 2,3,4N cars

3300 MFI (LG7) (VIN=N) 93 3,4A 2,3,4N cars

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

BAUD RATE: 8192

This is a GMP4 FULL FUNCTION ECM.

67 BYTES OF DATA IN OPEN AND SHORTED MODE

..PAGE

MODE 0 (RETURN TO NORMAL MODE)

ALDL REQUEST:

- MESSAGE ID = $F0

- MESSAGE LENGTH = $56

- MODE = $00

- SUM CHECK

THE ECM WILL RESPOND WITH THE FOLLOWING MESSAGE:

- MESSAGE ID = $F0

- MESSAGE LENGTH = $56

- MODE = $00

- SUM CHECK

MODE 1 (TRANSMIT FIXED DATA STREAM)

ALDL REQUEST:

- MESSAGE ID = $F0

- MESSAGE LENGTH = $56

- MODE = $01

- SUM CHECK

THE ECM WILL RESPOND WITH THE FOLLOWING MESSAGE:

- MESSAGE ID = $F0

- MESSAGE LENGTH = $99

- MODE = $01

- DATA BYTE 1

.

.

- DATA BYTE 67

- SUM CHECK

..HEAD02L ALDL NORMAL MESSAGE *F9MSG3* (F0 POLL)

MESSAGE CODE $F0 IS USED BY THE ECM TO POLL FOR THE PRESENCE

OF AN ALDL TESTING DEVICE. IT IS TRANSMITTED FROM THE ECM

WITH THE FOLLOWING FORMAT

- MESSAGE CODE = $F0

- MESSAGE LENGTH

- SUM CHECK

IF AN ALDL DEVICE IS PRESENT, IT SHOULD RESPOND WITH THE FOLLOWING

MESSAGE:

- MESSAGE CODE = $F0

- MESSAGE LENGTH = 85 + 0 = 85 = $55

- SUM CHECK

..PAGE

..HEAD02L ALDL DATA LIST

..head03L NUMBER OF DATA WORDS - 67

..head04L ALDL MODE 1 DATA LIST

WORD # DATA NAME DESCRIPTION

1 MW1 ( MINOR LOOP WORD 1 )

7 ENGINE RUNNING FLAG (1 = RUNNING)

6 M42A PASSED - ALLOW CHECK OF M42B

(EST CODE 42 CHECK IN BYPASS w/ ENGINE RUNNING)

5 AC CLUTCH FLAG 0 = ON 1 = OFF(0 = AC CLUTCH ON)

4 TCC ROAD SPEED 1st PULSE FLAG

3 TIMING ERROR CHECK BIT (1 = ERROR)

(SOFTWARE TIMING NOT VEHICLE TIMING)

2 INTERRUPT SERVICE EXECUTION EXCEEDED 6.25 MSEC.

1 BIT = 1 MEANS IN HOT OPEN LOOP

0 1=TPS TIP-IN / TIP-OUT FLAG FOR IAC MOTOR

2 MW2 ( MINOR LOOP WORD 2 )

7 2nd. ENG. RUN FLAG FOR CRANK FUEL

6 BIT = 1 MEANS HIGH BATTERY VOLTAGE - 1st PASS

5 BIT = 1 MEANS HIGH BATTERY VOLTAGE - 2ND PASS

(2nd PASS - DISABLE OUTPUTS)

4 BIT = 1 MEANS IN SERIAL DATA SERVICE DIAGNOSTIC MODE

3 BIT = 1 MEANS AT ALTITUDE (FOR SERIAL DATA USE ONLY)

2 REFERENCE PULSE OCCURRED (6.25 MSEC. CHECK)

1 1=A/C SHUTOFF FOR LEARNING

0 1=RAMP DECEL ENLEANMENT FLAG

3 MCUINST ( MINOR LOOP WORD )

7 1 = OFF 0 = ON (1 = A/C REQUESTED)

6 1 = ON 0 = OFF (1 = P/S CRAMP)

5 1 = CRUSE ACTIVE

4 1 = NOT USED

3 1 = OFF 0 = ON (0 = IN 4th GEAR)

2 1 = OFF 0 = ON (0 = IN 3rd GEAR)

1 1 = OFF 0 = ON (0 = IN 2nd GEAR)

0 1 = ON 0 = OFF (1 = IN P/N)

4 DIAGMW3 (STATUS OF SC1 INPUT DISCRETES)

7 0 = QDM FAULT 4 ( NOT USED )

6 0 = QDM FAULT 3

5 0 = QDM FAULT 2

4 0 = QDM FAULT 1

3 NOT USED

2 NOT USED

1 0 = BRAKE ON (FROM SC1SDI)

0 1 = HAVE HAD P/N TO AE ONCE

5 PIDMW1 (IDLE AIR CONTROL MODE WORD)

7 BIT = 1 MEANS AC REQUEST IS OFF

6 BIT = 1 MEANS AC BEING CONTROLLED

5 BIT = 1 MEANS AC COMPENSATION STEPS BEING REMOVED

4 THROTTLE FOLLOWER FLAG (1 = DECAY OR RISE)

3 IDLE SPEED MOTOR DIRECTION FLAG, OPEN LOOP & THROTTLE

FOLLOWER (1 = EXTEND MOTOR, DECREASE AIR)

2 IDLE SPEED OPEN LOOP FLAG (1 = NO, 0 = YES)

1 IDLE SPEED OPEN LOOP SPEED GT COMMAND (1 = YES)

0 AC COMPENSATION BEING LEARNED (1 = YES)

6 PIDMW2 (IDLE AIR CONTROL MODE WORD)

7 BIT = 1 MEANS P/N STATUS IN NEUTRAL

6 BIT = 1 MEANS P/N STATUS WAS IN NEUTRAL LAST CYCLE

5 HOT START IDLE SPEED OFFSET

4 1 = PROPORTIONAL STEP TAKEN

3 1 = DERIVITIVE STEP TAKEN

2 1 = INTEGRAL STEP TAKEN

1 COPY OF OPEN FLAG - USED IN PND IAC

0 BIT = 1 MEANS MIN. MOTOR LEARNED

7 MWFA (FUEL-AIR MODE WORD)

7 FLIP/FLOP FOR 3.125 OR 6.25 LOGIC

6 HIGH LIMIT FUEL CUTOFF ENABLED

5 POWER ENRICHMENT FLAG (1 = PE IS ACTIVE)

4 HAVE HAD DRIVE TO P/N TRANSITION

3 DELAY BLM UPDATE (1 = BL ADDR CHANGE)

2 BL ADDRESS CHANGE FLAG (1 = CHANGE)

1 BIT = 1 MEANS DECEL FUEL CUTOFF ENABLED

0 BIT = 1 MEANS DECEL ENLEANMENT ENABLED

8 MWFA1 (FUEL AIR MODE WORD)

7 OL/CL FLAG (1 = CLOSED LOOP, 0 = OPEN LOOP)

6 RICH-LEAN FLAG (1 = RICH, 0 = LEAN)

5 FIRST TIME CLOSED LOOP FLAG

4 FATC FILTER ACTIVE (COOLANT TEMP AIR-FUEL RATIO)

3 PROP STEP TAKEN FLAG (1 = RICH STEP, 0 = LEAN STEP)

2 FATI FILTER ACTIVE (TIMEOUT AIR FUEL RATIO)

1 LEARN CONTROL ENABLE FLAG (1 = ENABLE STORE, 0 = DISABLE)

0 200 MSEC. OLD P/N BIT FROM MCUINST (BYTE 3)

9 LCCPMW

7 1 = HIGH 0 = NO A/C HIGH A/C PRESSURE SWITCH

6 1 = CANISTER IS CLEAN (CCP)

5 1 = ENGINE HOT LIGHT ON

4 1 = FAN 2 ON

3 1 = ON 0 = OFF (1 = TCC LOCKED)

2 1 = IDLE FLAG FOR C/L

1 1 = FAN 1 ON

0 1 = CCP PURGE ON

10 NTPSLD THROTTLE POSITION LOAD

% = N/2.55

11 COOLDEGA COOLANT TEMPERATURE, LINEARIZED

DEG C = (N * .75) - 40

(deg F = 1.35N - 40)

12 COOLTSU START UP COOLANT TEMPERATURE

DEG C = (N * .75) - 40

(deg F = 1.35N - 40)

13 ADTHROT THROTTLE POSITION, A/D

VOLTS = N * 5/256

14 NTRPMX ENGINE SPEED (RPM) VARIABLE

RPM = N * 25

15 NEWRFPER TIME BETWEEN REFERENCE PULSES (MSB)

16 NEWRFPER+1 TIME BETWEEN REFERENCE PULSES (LSB)

RPM = 1,310,720 / (MSB * 256 + LSB)

17 FILTMPH FILTERED MILES PER HOUR (LSB)

MPH = N

(kph = 1.61N)

18 NOT USED

19 LV8 FILTERED LOAD VARIABLE (COUNTS)

N = A/D COUNTS

20 ADO2AF OXYGEN SENSOR VARIABLE (MILLIVOLTS = N * 4.44)

MILLVOLTS = N*4.44

21 ACNTDEL O2 CROSS COUNTS IN LAST SECOND (NUMBER) DELTA

N = COUNTS

22 CORRCL BASE PULSE (FUEL) C.L. FINE CORRECTION (COUNTS)

N = COUNTS

23 BLM BLOCK LEARN MULTIPLIER, SCALED 1, RANGE 0 - 2.0

N = COUNTS

24 BLMCELL CURRENT BLOCK LEARN MULTIPLIER CELL (NUMBER 0 - 15)

25 ISSPMP IDLE SPEED, PRESENT IAC MOTOR POSITION (COUNTS)

N = IAC STEPS

26 ISESDD DESIRED IDLE SPEED

RPM = N * 12.5

27 ACPRES AIR CONDITIONING PRESSURE TRANSDUCER

N = A/D COUNTS

28 TESTBYTE RESERVED FOR TESTING FOR STACK OVERWRITE

29 PURGEDC CHARCOAL CANISTER PURGE DUTY CYCLE

% DC = N / 2.56

30 ADBAT BATTERY VOLTAGE AD COUNTS

VOLTS = N / 10

31 DISPFLOW MASS AIR FLOW VARIABLE IN GRAMS/SEC. (MSB)

32 DISPFLOW+1 MASS AIR FLOW VARIABLE IN GRAMS/SEC. (LSB)

GRAMS/SEC. = MSB + (LSB * .00390625)

33 SAP TOTAL UNLIMITED SPARK ADVANCE REL. TO TDC (MSB)

34 SAP+1 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 = (MSB * 256 + LSB)

If Bit 7 of MSB = 1 then result is negative

value = 65536 - (MSB * 256 + LSB)

DEGREES = VALUE * 90/256

35 OLDPA3 ELECTRONIC SPARK CONTROL (KNOCK) SIGNAL INPUT

NUMBER = COUNTER VALUE

36 NOCKRTD ELECTRONIC SPARK CONTROL (KNOCK) ECM OUTPUT

DEG = N * .176

37 BPW INJECTOR BASE PULSE WIDTH (MSB)

38 BPW+1 INJECTOR BASE PULSE WIDTH (LSB)

MS = (MSB * 256 + LSB) / 65.536

39 FAVAL TOTAL FUEL AIR VALVE (MSB)

40 FAVAL+1 TOTAL FUEL AIR VALVE (LSB)

A/F RATIO = 65536 / [40 * (MSB * 256 + LSB)]

41 ACUMFUEL RUNNING TOTAL OF FUEL DELIVERED (MSB)

42 ACUMFUEL+1 RUNNING TOTAL OF FUEL DELIVERED (LSB)

GALLONS = (MSB * 256 + LSB)/22,259

NOTE: THIS IS 0 ON START UP AND WILL ROLLOVER

43 ACUMDIST RUNNING TOTAL OF DIST. TRAVELED

MILES = N * .0005

44 TIME ENGINE RUNNING TIME IN SECONDS (MSB)

45 TIME+1 ENGINE RUNNING TIME IN SECONDS (LSB)

SECOND = (MSB * 256 + LSB)

46 MALFFLG1 HISTORY MALF FLAG WORD 1

7 HISTORY CODE 13 - O2 SENSOR

6 HISTORY CODE 14 - COOLANT SENSOR HIGH

5 HISTORY CODE 15 - COOLANT SENSOR LOW

4 HISTORY CODE 16 - BATTERY VOLTAGE HIGH

3 HISTORY CODE 17 - NOT USED

2 HISTORY CODE 18 - NOT USED

1 HISTORY CODE 19 - NOT USED

0 HISTORY CODE 21 - THROTTLE POSITION HIGH

47 MALFFLG2 HISTORY MALF FLAG WORD 2

7 HISTORY CODE 22 - THROTTLE POSITION LOW

6 HISTORY CODE 23 - NOT USED

5 HISTORY CODE 24 - VEHICLE SPEED SENSOR LOW

4 HISTORY CODE 25 - NOT USED

3 HISTORY CODE 26 - QDM FAILURE

2 HISTORY CODE 27 - 2nd GEAR SWITCH FAILURE

1 HISTORY CODE 28 - 3rd GEAR SWITCH FAILURE

0 HISTORY CODE 29 - 4th GEAR SWITCH FAILURE

48 MALFFLG3 HISTORY MALF FLAG WORD 3

7 HISTORY CODE 31 - P/N SWITCH FAILURE

6 HISTORY CODE 32 - NOT USED

* 5 HISTORY CODE 33 - MASS AIR FLOW SENSOR HIGH

* 4 HISTORY CODE 34 - MASS AIR FLOW SENSOR LOW

3 HISTORY CODE 35 - NOT USED

2 HISTORY CODE 36 - NOT USED

1 HISTORY CODE 37 - NOT USED

0 HISTORY CODE 38 - BRAKE SWITCH FAILURE

49 MALFFLG4 HISTORY MALF FLAG WORD 4

7 HISTORY CODE 39 - TCC FAILURE

6 HISTORY CODE 41 - NOT USED

5 HISTORY CODE 42 - EST FAILURE

4 HISTORY CODE 43 - ESC FAILURE

3 HISTORY CODE 44 - O2 SENSOR LEAN

2 HISTORY CODE 45 - O2 SENSOR RICH

1 HISTORY CODE 46 - POWER STEERING PRESSURE SWITCH

0 HISTORY CODE 47 - NOT USED

50 MALFFLG5 HISTORY MALF FLAG WORD 5

7 HISTORY CODE 48 - MISFIRE

6 HISTORY CODE 49 - VACUUM LEAK

5 HISTORY CODE 51 - PROM ERROR

4 HISTORY CODE 52 - NOT USED

3 HISTORY CODE 53 - NOT USED

2 HISTORY CODE 54 - NOT USED

1 HISTORY CODE 55 - NOT USED

0 HISTORY CODE 56 - NOT USED

51 TESTBYTE

52 MALFFLG7 HISTORY MALF FLAG WORD 7

7 HISTORY CODE 66 - A/C PRESSURE TRANSDUCER FAILURE

6 HISTORY CODE 67 - NOT USED

5 HISTORY CODE 68 - NOT USED

4 HISTORY CODE 69 - NOT USED

3 HISTORY CODE 88 - RESET

2 HISTORY CODE 72 - NOT USED

1 HISTORY CODE 73 - NOT USED

0 HISTORY CODE 74 - NOT USED

53 TESTBYTE

54 MALFFLG7 HISTORY MALF FLAG WORD 7

7 HISTORY CODE 66 - A/C PRESSURE TRANSDUCER FAILURE

6 HISTORY CODE 67 - NOT USED

5 HISTORY CODE 68 - NOT USED

4 HISTORY CODE 69 - NOT USED

3 HISTORY CODE 88 - RESET

2 HISTORY CODE 72 - NOT USED

1 HISTORY CODE 73 - NOT USED

0 HISTORY CODE 74 - NOT USED

55 TESTBYTE

56 CURMALF1 - CURRENT MALF FLAG WORD 1

7 CURRENT CODE 13 - O2 SENSOR

6 CURRENT CODE 14 - COOLANT SENSOR HIGH

5 CURRENT CODE 15 - COOLANT SENSOR LOW

4 CURRENT CODE 16 - BATTERY VOLTAGE HIGH

3 CURRENT CODE 17 - NOT USED

2 CURRENT CODE 18 - NOT USED

1 CURRENT CODE 19 - NOT USED

0 CURRENT CODE 21 - THROTTLE POSITION HIGH

57 CURMALF2 - CURRENT MALF FLAG WORD 2

7 CURRENT CODE 22 - THROTTLE POSITION LOW

6 CURRENT CODE 23 - NOT USED

5 CURRENT CODE 24 - VEHICLE SPEED SENSOR LOW

4 CURRENT CODE 25 - VEHICLE SPEED SENSOR HIGH

3 CURRENT CODE 26 - QDM FAILURE

2 CURRENT CODE 27 - 2nd GEAR SWITCH FAILURE

1 CURRENT CODE 28 - 3rd GEAR SWITCH FAILURE

0 CURRENT CODE 29 - 4th GEAR SWITCH FAILURE

58 CURMALF3 - CURRENT MALF FLAG WORD 3

7 CURRENT CODE 31 - P/N SWITCH FAILURE

6 CURRENT CODE 32 - NOT USED

5 CURRENT CODE 33 - MASS AIR FLOW SENSOR LOW

4 CURRENT CODE 34 - MASS AIR FLOW SENSOR HIGH

3 CURRENT CODE 35 - NOT USED

2 CURRENT CODE 36 - NOT USED

1 CURRENT CODE 37 - NOT USED

0 CURRENT CODE 38 - BRAKE SWITCH FAILURE

59 CURMALF4 - CURRENT MALF FLAG WORD 4

7 CURRENT CODE 39 - TCC FAILURE

6 CURRENT CODE 41 - CAM SENSOR FAILURE

5 CURRENT CODE 42 - EST FAILURE

4 CURRENT CODE 43 - ESC FAILURE

3 CURRENT CODE 44 - O2 SENSOR LEAN

2 CURRENT CODE 45 - O2 SENSOR RICH

1 CURRENT CODE 46 - POWER STEERING PRESSURE SWITCH

0 CURRENT CODE 47 - UART LINK FAILURE

60 CURMALF5 CURRENT MALF FLAG WORD 5

7 CURRENT CODE 48 - MISFIRE

6 CURRENT CODE 49 - VACUUM LEAK

5 CURRENT CODE 51 - PROM ERROR

4 CURRENT CODE 52 - NOT USED

3 CURRENT CODE 53 - NOT USED

2 CURRENT CODE 54 - NOT USED

1 CURRENT CODE 55 - NOT USED

0 CURRENT CODE 56 - NOT USED

61 TESTBYTE

62 CURMALF7 CURRENT MALF FLAG WORD 7

7 CURRENT CODE 66 - A/C PRESSURE TRANSDUCER FAILURE

6 CURRENT CODE 67 - NOT USED

5 CURRENT CODE 68 - NOT USED

4 CURRENT CODE 69 - NOT USED

3 CURRENT CODE 88 - RESET

2 CURRENT CODE 72 - NOT USED

1 CURRENT CODE 73 - NOT USED

0 CURRENT CODE 74 - NOT USED

63 TESTBYTE

64 CURMALF7 CURRENT MALF FLAG WORD 7

7 CURRENT CODE 66 - A/C PRESSURE TRANSDUCER FAILURE

6 CURRENT CODE 67 - NOT USED

5 CURRENT CODE 68 - NOT USED

4 CURRENT CODE 69 - NOT USED

3 CURRENT CODE 88 - RESET

2 CURRENT CODE 72 - NOT USED

1 CURRENT CODE 73 - NOT USED

0 CURRENT CODE 74 - NOT USED

65 TESTBYTE

66 PROMIDA FIRST PROM I.D. WORD (MSB)

67 PROMIDA+1 SECOND PROM I.D. WORD (LSB)

PROM ID = (MSB * 256 + LSB)