BMW 5251 Service Manual page 436

130-46
Fuel Injection
When system faults are detected, a diagnostic trouble code
(DTC) is stored in the engine control module (ECM). The MIL
also illuminates if an emissions-related fault is detected.
When faults arise, or if the malfunction indicator lamp (MIL) is
illuminated, begin troubleshooting by connecting BMW ser-
vice tester DISplus. MoDiC, GTI or equivalent scan tool. The
capabilities of OED I I software has the potential to save hours
of diagnostic time and to help avoid incorrect component re-
placement and possible damage to system components.
CA UTIOiU-
The tests in this section may set fault codes (DTCs) in the
ECM and illuminate the MIL. After ail testing is completed,
access and clear DTC fault memory using an OED I/ or
BMW compatible scan tool. See OBD On-Board Diag-
nostics.
Only use a digital multimeter for electrical tests.
Relay positions can vary. Be sure to confirm relay posi- .
tion by identifying the wiring in the socket using the wir-
ing diagrams-found in ~ ~ ~ ~ l e c t r i c a l Wiring
Diagrams.
NOTE-
OED I 1 fault memory (including an illuminated MIL) can
only be reset using~the special scan tool. Removing the
connector from the ECM or disconnecting the battery will
not erase the fault memory.
The BMW-dedicated 20-pin diagnostic link connector
(DLC) is in the right rear of the engine compartment.
The 16-pin OBD I 1 diagnostic connector (arrow) is located
inside the car on the lower left dash panel.