Looking for 95 Chevy Tahoe Codes

[Madjack]

Anyone have codes for a 95 Chevy Tahoe??
PCM-16197427 Prom-BJYK

I'm new at PCM hacking so I'm also looking for a starting place...

I have the ALDL interface built and tested and have had some responses, just not sure where to start or decode...

Thanks. Mike

[sean]

DATA STREAM A217 SPECIFICATION



..PAGE
SPECIFICATIONS FOR DATA STREAM INFORMATION
------------------------------------------
PCM-6 WITH 4L60E TRANSMISSION

ENGINE USAGE:
L03 TBI 5.0L 94 VIN = H C,K,G
L05 TBI 5.7L 94 VIN = K C,K,G
L35 CPI 4.3L 94 VIN = W S,T,M,L
LB4 TBI 4.3L 94 VIN = Z G,M,L,S,T,C,K
LB4 TBI 4.3L 94 VIN = Z C,K MANUAL TRANS.
* L03 TBI 5.0L 95 VIN=H C,K,G
* L05 TBI 5.7L 95 VIN=K C,K,G
* L35 CPI 4.3L 95 VIN=W S,T,M,L
* LB4 TBI 4.3L 95 VIN=Z G,M,L,S,T,C,K




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

BAUD RATE : 8192 BAUD - BI-DIRECTIONAL


..PAGE
MODE 0 (RETURN TO NORMAL MODE)
ALDL REQUEST:
- MESSAGE ID = $F4
- MESSAGE LENGTH = $56
- MODE = $00
- SUM CHECK

THE PCM WILL RESPOND WITH THE FOLLOWING MESSAGE:
- MESSAGE ID = $F4
- MESSAGE LENGTH = $56
- MODE = $00
- SUM CHECK

MODE 1 (TRANSMIT FIXED DATA STREAM)
ALDL REQUEST:
- MESSAGE ID = $F4
- MESSAGE LENGTH = $57
- MODE = $01
- MESSAGE = $00
- SUM CHECK

THE PCM WILL RESPOND WITH THE FOLLOWING MESSAGE:
- MESSAGE ID = $F4
- MESSAGE LENGTH = $95
- MODE = $01
- DATA BYTE 1
.
.
- DATA BYTE 63
- SUM CHECK

MODE 10 (CLEAR MALFUNCTION CODES)
ALDL REQUEST:
- MESSAGE ID = $F4
- MESSAGE LENGTH = $56
- MODE = $0A
- CHECKSUM


THE PCM WILL RESPOND WITH THE FOLLOWING MESSAGE:
- MESSAGE ID = $F4
- MESSAGE LENGTH = $56
- MODE = $0A
- SUM CHECK



..PAGE
..HEAD02L ALDL DATA LIST
..HEAD03L NUMBER OF DATA WORDS - 63
..HEAD04L ALDL MODE 1 DATA LIST
WORD # DATA NAME DESCRIPTION

1 PROMIDA FIRST PROM I.D. WORD (MSB)
2 PROMIDA+1 SECOND PROM I.D. WORD (LSB)
ID = N
3 NVMW NON-VOLITALE MODE WORD
0 02 SENSOR READY FLAG 1 = READY
1 CLOSED LOOP TIMER O.K. FLAG 1 = TIMER O.K.
2 1 = RAM REFRESH ERROR HAS OCCURRED
3 IMPROPER SHUTDOWN FLAG 1 = IMPRO 0 = PROPER
4 HOT RESTART PROCEEDING FLAG
5 NOT USED
6 NOT USED
7 MALF 42 FAIL FLAG (EST. MONITOR)
4 DIACMW3 MODE WORD FOR IDLE CONTROL
0 1 = A/C ON
1 1 = DRIVE 0 = P/N
2 1 = CONDITIONS FOR C/L ON RPM HAVE BEEN MET
CONDITIONS ARE TPS CLOSED AND LOW MPH.
3 1 = C/L ON RPM ENABLED
CONDITIONS MET LONG ENOUGH OR LOW RPM ON A/T VEH.
4 1 = STALL SAVER
5 1 = POWER STEERING PRESSURE LOAD ACTIVE
6 1 = THROTTLE KICKER HAS BEEN DISABLED ONCE
7 1 = IDLE RPM TO HIGH (SIGN)
5 ISSPMP IAC PRESENT MOTOR POSITION
N = IAC MOTOR STEPS

[sean]

6 MALFFLG1 MALF FLAG WORD 1
0 CODE 21 THROTTLE POSITION HIGH
1 CODE 19 NOT USED
2 CODE 18 NOT USED
3 CODE 17 NOT USED
4 CODE 16 2002 PPM VEH. SPEED SENSOR FAILURE
5 CODE 15 COOLANT SENSOR LOW TEMPERATURE
6 CODE 14 COOLANT SENSOR HIGH TEMPERATURE
7 CODE 13 OXYGEN SENSOR
7 MALFFLG2 MALF FLAG WORD 2
0 CODE 29 NOT USED
1 CODE 28 PRESSURE SWITCH MANIFOLD
2 CODE 27 NOT USED
3 CODE 26 NOT USED
4 CODE 25 MAT SENSOR HIGH
5 CODE 24 VEHICLE SPEED SENSOR
6 CODE 23 MAT SENSOR LOW
7 CODE 22 THROTTLE POSITION LOW
8 MALFFLG3 MALF FLAG WORD 3
0 CODE 38 BRAKE OFF
1 CODE 37 BRAKE ON
2 CODE 36 IAC THROTTLE KICKER FAILURE
3 CODE 35 IAC FAILURE
4 CODE 34 MAP SENSOR LOW
5 CODE 33 MAP SENSOR HIGH
6 CODE 32 EGR FAILURE
7 CODE 31 GOVERNOR FAILURE
9 MALFFLG4 MALF FLAG WORD 4
0 CODE 47 NOT USED
1 CODE 46 VATS FAILURE
2 CODE 45 OXYGEN SENSOR RICH
3 CODE 44 OXYGEN SENSOR LEAN
4 CODE 43 ESC FAILURE
5 CODE 42 EST. MONITOR
6 CODE 41 1X (CAM PULSE) SENSOR FAILURE
7 CODE 39 TCC OFF
10 MALFFLG5 MALF FLAG WORD 5
0 CODE 56 NOT USED
1 CODE 55 ADU ERROR
2 CODE 54 FUEL PUMP RELAY MALFUNCTION
3 CODE 53 SYSTEM VOLTAGE HIGH
4 CODE 52 SYSTEM VOLTAGE HIGH-LONG TEST
5 CODE 51 PROM ERROR
6 CODE 49 NOT USED
7 CODE 48 NOT USED
11 ISDSMP IAC DESIRED MOTOR POSITION
N = IAC MOTOR STEPS
12 DIACMW1 IDLE AIR CONTROL NV MODE WORD
0 1 = MOTOR RESET IN PROGRESS
1 FIRST DRIVEAWAY FLAG FOR IAC KICKDOWN LOGIC
1 = IACV COLD OFFSET HAS BEEN KICKED DOWN THIS START
2 0 = RESET REQUESTED
3 NOT USED
4 1 = A STABLE IDLE WITH WARM ENGINE HAS OCCURRED THIS RUN
CYCLE - A/C OFF IN DRIVE
5 1 = A STABLE IDLE WITH WARM ENGINE HAS OCCURRED THIS RUN
CYCLE - A/C ON IN DRIVE
6 1 = FIRST PASS OF MALF 36 HAS FAILED
7 NOT USED
13 DIACMW2 IDLE AIR CONTROL NV MODE WORD
0 MOTOR DIRECTION 1=EXTEND 0=RETRACT
1 NOT USED
2 COIL A STATE
3 COIL B STATE
4 STEPPER MOTOR ON/OFF STATUS 1=ON 0=OFF
5 NOT USED
6 NOT USED
7 NOT USED
14 DIACMW4 MODE WORD FOR IDLE CONTROL
0 1 = ETC ONCE FLAG
1= SPECIAL IACV OPEN LOOP COLD ENG MODIFIERS ARE DISABLE
1 1 = ETC * K97_EDP
2 1 = THROTTLE KICKER ACTIVE
3 1 = THROTTLE KICKER DISABLE REQUESTED
4 1 = THROTTLE KICKER BARO DISABLE REQUEST
5 1 = PART 2 OF DIAGNOSTIC TEST TO BE

[sean]

6 1 = PROP LIMITING AUTHORITY BEING EXERCISED
7 1 = ADD DERIVATIVE TERM TO GPSFLOW
0 = SUBTRACT DEVIVTIVE TERM FROM GPSFLOW
15 COOLDEGA NORMALIZED ENGINE TEMPERATURE nondefaulted
DEGREES C = .75N - 40
DEGREES F = 1.35N - 40
16 ADBAT BATTERY VOLTAGE A/D VALUE
VOLTAGE = N/10
17 ADTHROT THROTTLE POSITION A/D VALUE
VOLTS = N*5/256
18 ADMAP MANIFOLD PRESSURE A/D VALUE (updated in 100ms loop)
VOLTS = N*5/256
kpa = (N + 28.06)/2.71
19 ADO2A OXYGEN SENSOR VARIABLE
mV = 4.42N
20 MWAF AIR FUEL MODE WORD
0 PE DELAY TIME COMPLETE FLAG
1 1 = VATS FREQUENCY TEST PASSED
2 BL. ADDRESS CHANGE FLAG 1=CHANGE
3 DELAY BLM UPDATE 1=BL ADDR CHANGE
4 DE FLAG 1=DE IS ACTIVE
5 PE FLAG 1=PE IS ACTIVE
6 AE FLAG 1=AE IS ACTIVE
7 DELIVER ASYNCH. PULSE FLAG
21 SDMW SERIAL DATA MODE WORD
0 1 = IN MODE 10 OF ALDL (MESSAGE ID=$F5)
1 1 = IN MODE 10 OF ALDL (MESSAGE ID=$F4)
2 1 = TRANSMISSION DIAGNOSTICS DISABLED
3 NOT USED
4 NOT USED
5 1 = TRANSMIT OVERRUN HAS OCCURRED
6 1 = TRANSMISSION IN PROGRESS
7 1 = SECOND BYTRE TRANSMISSION PENDING
22 MWBG MINOR LOOP MODE FLAG
0 FACTORY TEST ENTERED
1 AE CLAMP FLAG 1=CLAMP IS ACTIVE
2 SKIP MALF 42 DUE TO ALDL
3 1st REF FLAG 1=REFERENCE PERIOD
4 1=IGNITION OFF
5 1=HIGH MAT CONDITIONS OBSERVED
6 FIRST GOOD M42A FLAG
7 LOCK-IN MALF 42A 1=LOCKED IN
23 MW1 MINOR MODE WORD 1
0 ADVANCE FLAG 0=ADV. 1=RETARD
1 CHECK ENGINE LIGHT DELAY FLAG
2 LOOP RAN OVER 6.25 MSEC
3 OPEN TPS VE FLAG 1=OPEN
4 RUN FUEL FLAG 1=RUNNING
5 VE INT RESET FLAG 1=RESET
6 MAJOR LOOP EST MONITOR ENABLE
7 ENGINE RUNNING FLAG 1=RUNNING
24 MW2 MINOR LOOP MODE WORD 2
0 SYNCHRONOUS MAP SENSOR READS IN EFFECT
1 O/L IDLE FLAG FOR AIR SWITCH ENGAGE

[sean]

AT IDLE
2 REFERENCE PULSE OCCURRED
3 1 = DIAGNOSTIC SWITCH IN FACTORY TEST POSITION
4 1 = DIAGNOSTIC SWITCH IN DIAGNOSTIC POSITION
5 1 = REF PULSE HAS OCCURRED
6 1 = IDLE SPARK ENABLED
7 IDLE FLAG
25 IODPORTC I/O PORT C
0 1 = A/C REQUEST
1 1 = BRAKE SWITCH (1=BRAKE PRESSED)
2 RANGE 1 SEE PRNDL TABLE
3 RANGE 2 SEE PRNDL TABLE
4 RANGE 3 SEE PRNDL TABLE
5 NOT USED
6 NOT USED
7 FOUR WHEEL DRIVE LOW 1=ON

PRNDL TABLE:

RANGE1 RANGE2 RANGE3 GEAR
------------------------------
0 1 1 LOW
1 1 1 DRIVE2
1 1 0 DRIVE3
1 0 0 DRIVE4
1 0 1 P/N
0 0 1 REVERSE

26 CLCCMW MAJOR LOOP MODE WORD 1
0 SYNCHRONOUS AE FLAG 1=SYNCH AE
1 SLOW RICH/LEAN FLAG 1=RICH
2 AIR MANAGEMENT ON 1=ON
3 DECEL FUEL CUT-OFF FLAG 1=DFCO
4 1 = OVERSPEED FUEL SHUTOFF
5 DFCO IAC FAST FILTERED FLAG
6 1 = N.V. MEMORY BOMBED
7 1 = HAS BEEN IN C.L AT LEAST ONCE SINCE RESTART
27 ADBARO RAW A/D COUNTS FOR BARO FILT IN TRANS
VOLTS = N*5/256
kpa = (N + 28.06)/2.71
28 LCCPMW TCC & A/C MODE WORD
0 NOT USED
1 1 = SPK. CORRECTION DUE TO MAT IS NEGATIVE
2 NOT USED
3 1 = A/C AE ENABLED
4 ACPSCT FLAG (A/C ON)
5 PARK/NEUTRAL (use range 1,2,3 to determine p/n status)
6 NOT USED
7 1 = CCP SOLENOID ENERGIZED
29 MWAF1 AIR FUEL MODE WORD 1
0 DFCO TPS AE FLAG
1 LEARN CONTROL ENABLE FLAG 1=ENABLE
2 1 = LOW BATTERY
3 A/F DECAY INT DONE FLAG FOR COLD PRK TO DRIVE
4 ASYNCHRONOUS PULSE FLAG (AP FLAG)
5 CLOSED LOOP FOR O/L IDLE CONDITION
6 RICH-LEAN FLAG 1=RICH 0=LEAN
7 CLOSED LOOP FLAG 1=CLOSED
30 TCCMODE TCC MODE WORD FLAGS
0 1 = TCC IS BEING FORCED OFF
1 1 = TCC ENABLE SOLENOID VALID
2 1 = LOW THRESHOLD FOR COPETCC SELECTED
3 1 = USE HYST FOR VEH. SPD.
4 1 = TCC IS IN RELEASE MODE SLIPPING
5 1 = TCC IS IN LOCK-ADJUST MODE
6 1 = TCC IS BEING APPLIED
7 1 = NEGATIVE SLIP RECENTLY PREVENTS APPLY
31 FILTMPH FILTERED MPH VARIABLE
MPH = N
KPH = 1.61N
32 IODPORTB SOLENOID COMBINATION FOR

[sean]

DIGITAL EGR
0 SHIFT A SEE TABLE
1 SHIFT B SEE TABLE
2 IAC COIL A
3 IAC COIL B
4 IAC ENABLE 1=ENABLE
5 FORCE MOTOR ENABLE 1=ENABLE
6 REF IRQ CLR
7 M/CLR


SHIFT B SHIFT A GEAR
----------------------
0 0 3RD
----------------------
0 1 4TH
----------------------
1 0 2ND
----------------------
1 1 1ST
----------------------


33 PPSWVLT BATTERY VOLTAGE FROM PPSW A/D COUNTS
VOLTS = N/10
34 NTRPMX RPM VARIABLE USED FOR TABLE F1 EXTENSION LOGIC
RPM = N * 25
35 OLDRFPER LAST MINOR LOOP REFERENCE PERIOD FROM ECU (MSB)
36 OLDRFPER+1 LAST MINOR LOOP REFERENCE PERIOD FROM ECU (LSB)
MSEC = N/65.536
RPM = 65.536* # OF CYLINDER/N
6 CYL = 20 8 CYL = 15
37 EGRDC EGR DUTY CYCLE
% = N/2.56
38 MW3 MISCELLANEOUS MODE WORD
0 CPI/PFI SINGLE FIRE FLAG 1=SINGLE FIRE
1 SINGLE FIRE FIRST TIME 1=FIRST TIME
2 REFRESH RAM IN BACK GROUND 1=YES
3 1 = POWERDOWN IN PROGRESS
4 1 = HIGH BATTERY VOLTAGE
5 DFCO SPARK FILTER FLAG
6 START-UP SPARK FILTER DONE FLAG 1 = DONE
7 TRANSITION FLAG 1=TRANSITION ACTIVE
39 TIMEENG ENGINE RUNNING TIME,SECONDS (MSB)
40 TIMEENG+1 ENGINE RUNNING TIME,SECONDS (LSB)
SECONDS = N
41 DESSPD DESIRED IDLE RPM
RPM = 12.5N
42 NDTHRPOS THROTTLE POSITION FOR ENGINE
% = N/2.56
43 MW4 MODE WORD 4
0 1 = HIGH ESC ACTIVITY FLAG
1 1 = ZERO ACTIVITY FLAG
2 BLOCK LEARN CLOSED THROTTLE POSITION FLAG 1=THROT CLOSED
3 1 = VARIABLE TUNING CONTROL

[sean]

ENABLED
4 1 = A/C DISABLED DUE TO HIGH RPM
5 1 = A/C ANTICIPATED TO BE ON
6 1 = CONVERTER OVERTEMP DETECTED
7 1 = QUASI CLOSED LOOP ENABLED
44 MW5 MODE WORD 5
0 1 = ACTUAL ENGINE SPEED OVER DESIRED SPEED
1 1 = DELATCH ACTIVE
2 1 = SHIFT LIGHT ON
3 1 = HIGH RPM INDICATED BY TRANS. ABUSE LOGIC
4 1 = POWER STEERING CRAMP SAG/STALL SAVER ACTIVE
5 1 = A-INJECTORS FIRED AT FIRST REF. PULSE FLAG
6 1 = SINGLE FIRE ALT EXIT IS DESIRED
7 NOT USED
45 SAREFFNL FINAL VALUE OF SAREF(MSB)
46 SAREFFNL FINAL VALUE OF SAREF(LSB)
DEGREES = N*90/256
47 PA2OLD ECU PA2 COUNTER VALUE FROM LAST MINOR LOOP(MSB)
N = COUNTS
48 PA2OLD+1 ECU PA2 COUNTER VALUE FROM LAST MINOR LOOP(LSB) NOT USED
49 INT CLOSED LOOP INTEGRATOR VALUE
N = INTEGRATOR COUNTS
50 DESTPS DESIRED GOVERNING TPS VALUE TO BE OUTPUT
% = N/2.56
51 ALDLCNTR ALDL RICH/LEAN CHANGE COUNTER
N = COUNTS
52 LEGRMW EGR & SPARK MODE WORD
0 EGR DIAG INT RESET FLAG
1 1 = BURST KNOCK RETARD ACTIVE
2 EGR HI VAC HYST FLAG
3 AE FIRST TIME FLAG
4 EGR MAP HYST FLAG
5 EGR TPS HYST FLAG
6 EGR MPH HYST FLAG
7 EGR ON CONDITION
53 GOVMW ELECTONIC GOVERNOR MODE WORD
0 1 = CURRENTLY IN RPM GOVERNING MODE
1 1 = GOV LEAD MODE ANTICIPATING RPM GOVERNING
2 RPM OVERSPEED FLAG 1 = RPM OVERSPEED
3 GOVERNOR OVER SPEED LIGHT ON
4 1 = RPM LEAD TPS RETURN MODE
5 NOT USED
6 MPH OVERSPEED FLAG 1 = MPH OVERSPEED
7 1 = CURRENTLY IN MPH GOVERNING MODE
54 BLMCELL BLOCK LEARN MULTIPLIER CELL
N = BLOCK LEARN CELL
55 BLM BLOCK LEARN MULTIPLIER
N = MULTIPLIER
56 NOCKRTD KNOCK RETARD
DEGREES = 45N/256
57 BPW BASE PULSE WIDTH(MSB)
58 BPW+1 BASE PULSE WIDTH(LSB)
mSEC = N/65.536
59 DSEGRPOS DESIRED EGR COMMAND
% = N/2.56
60 ACEGRPOS LINEAR EGR ACTUAL PINTLE POSITION
% = N/2.56
61 ADEGRP LINEAR EGR PINTLE POSITION RAW A/D COUNTS
N = EGR POSITION A/D COUNTS
62 PURGEDC PURGE DUTY CYCLE VALUE
% = N/2.56
63 MATDEGA NON DEFAULTED MAT
DEGREES C = .75N - 40
DEGREES F = 1.35N - 40


[RoboGeek]

now my head REALLY hurts! ;D

where did you find that info? Hopefully not a top secret source..lol