Honda Bmw 5 Service Manual

OBD On-Board Diagnostics 
I I 
General ........................... OBD-1 Diaqnostic Trouble Codes (DTCs) . . OBD-9 
On-Board Diagnostics (OBD I!) ..... OBD-I 
Malfunction Indicator  Light (MIL) 
........ OBD-2 
Scan  tools and scan  tool display. 
........ OBD-3 
Diagnostic monitors 
.................. OED-4 
Drive cycle 
......................... OED-6 
Readiness  codes 
.................... OBD-6 
Diagnostic trouble  codes 
(DTCs) ........ OBD-7 
- 
Automatic transmission  diagnostic 
trouble codes...

OED-2 
On-Board  Diagnostics 
Specialized OED II scan tool equipment is needed  to access 
the  fault memory and 
OED I1 data. 
The  extra hardware needed  to operate the OED 
I1 system 
consists mainly  of the  following: 
* Additional  oxygen sensors downstream  of the  catalytic 
converters. 
Fuel  tank  pressure sensor  and device to pressurize 
fuel 
storage system. 
Several engine and performance  monitoring devices 
Standardized  16-pin 
OED II connector  under the 
dashboard. 
Upgraded...

OBD-3 
On-Board 
~iactnosticsl 
Additional MIL information: 
A  fault  code  is stored within  the ECM upon  the first 
occurrence  of a fault  in the  system being  checlted. 
Two  complete  consecutive drive cycles with the  iault 
present  illuminate  the MIL.  The exception to the two-fault 
requirement is  a catalyst-damaging  fault, which illuminates 
the MIL  immediately. 
If  the  second  drive cycle  was not complete  and the fault 
was  not checked,  the ECM  counts the third  drive cycle as...

- - 
On-Board Diagnostics 
Professional diagnostic  scan tools available atthe time of this 
printing  include the BMW factory tools 
(DISplus, GTI, 
MoDiC) and  a small  number  of aftermarket BMW-specific 
tools.  See 
020 Maintenance. 
In  addition  to the  professional  line of scan  tools, inexpensive 
generic  OBD 
II scan tool software programs and handheld 
units  are readily available.  Though limited, they  are 
nonetheless powerful diagnostic tools. These tools read  live 
data  streams and...

On-Board Diagnostics 
Catalyst monitoring.  Thisstrategy  monitors the outputofthe 
precatalyst  and post-catalyst oxygen sensors, comparing the 
oxygen  content going into the catalytic converter  to the 
oxygen leaving  the converter. 
The  diagnostic executive 
lknows that most of the oxygen 
should  be used up  during the oxidation phase.  If it detects 
higherthan  programmed values,  afault is set and the MIL 
illuminates. 
Misfire  detection.  This strategy monitors crankshaft  speed...

OBD-6 
On-Board Diagnostics 
Fuel system monitoring.  This monitor looks at the fuel 
delivery  needed (long 
/short term fuel trim)  for proper engine 
operation  based on programmed  data. If too much or not 
enough  fuel is delivered over  a predetermined  time, a DTC is 
set  and  the MIL  illuminates. 
Fuel trim  refers to adiustments  to base fuel schedule. 
Lono- ., term  fuel trim refers to gradual adjustments  to the fuel 
calibration adjustment as compared  to short term  fuel trim. 
Long...

On-Board Diagnostics 
Readiness codes indicate whether  the OED Ii system is 
actually ready  to monitor the various emission control 
systems  on the vehicle.  The vehicle must complete a drive 
cycle  to set  readiness codes.  The code is binary: 
0 for ready 
1 for not ready 
f 
4 The  parameters which are monitored  for readiness  are: 
llM readiness codes 
1. Catalyst efficiency 
2. Catalyst  heating 
3. Fuel tank evaporative control 
4. Secondary  air injection 
5. 
NC refrigerant 
6. Oxygen...

OBD-8 
I On-Board Diagnostics 
DTC digit interpretation 
1st digit 
P powertrain 
B body 
C  chassis 
2nd  digit 
0 SAE 
1 BMW 
3rd digit 
0 
1 
2 
3 
4 
5 
6 
7 
4th - 5th digits  total 
system 
airlfuei induction 
fuel  injection 
ignition  system  or  misfire 
auxiliary  emission  control 
vehicle speed 
& idle  control 
ECM 
inputs/outputs 
transmission 
individual circuits  or 
components 
DTC example: P 0 3 0 6 
P: A powertrain problem 
0: SAE sanctioned or  generic 
a 3: Related to an  ignition...

On-Board Diagnostics 
DIAGNOSTIC TROUBLE CODES 
(DTCs) 
Below is a listing  of E39 powertrain  (automatic transmission 
and  engine) 
SAE P-codes, the  corresponding  BMW fault 
codes,  and the fault  code  definitions. 
BMW fault codes expand  on the SAE sanctioned DTCs and 
are  accessible primarily through  the BMW  diagnostic  scan 
tool  or a BMW-specific scan  tool. 
l~utomatic transmission diagnostic trouble  codes 
P-code 
IBMW-FC I DTC  Definition 
Ip0560 196 ISystem Voltage I 
IPO~OO I129...

On-Board Diagnostics 
l~utornatic transmission  diagnostic trouble codes  (continued) - 
P-code /BMW-FC I DTC Definition - PO732 
PO732 
PO733 
PO733 
PO733 
PO733 
PO734 - 
I I 
I  I 
PO742 / 48 l~orque Converter Clutch Circuit  Stuck On 
PO734 
100 
132 
53 
57  122 
133 
54 
PO735 
PO735 
PO735 
PO740 
PO740 
PO740 
PO741 
I I 
PO743 14 l~or~ue Converter Clutch Circuit Electrical 
Gear 
2 Incorrect  Ratio 
Gear  2 Incorrect  Ratio 
Gear  3 incorrect Ratio 
Gear  3 Incorrect Ratio 
Gear 3 Incorrect...