Engine Controls - False DTCs
SECTION2
GROUP
28
NO.
824
DATE
Apr.-97
New engine control module (ECM)
850 1996-1997
REFERENCE: TP 2308202, SECTION 2 (23, 28) MOTRONIC 4.4; 850 1996-
This bulletin supersedes the earlier SB 28-824 dated Jan. -97, which should be discarded.
New engine control module (ECM)
Background:
A new engine control module (ECM) is introduced to avoid false DTC.
Replace control module according to table below and continue with "Activating on-board diagnostic system (OBD)".
P/N for control modules
Activating on-board diagnostic system
(OBD)
- Reconnect hoses and reinstall components
- Erase diagnostic trouble codes (DTCs)
- Run the engine to operating temperature (above 70°C 184°F)
- Air conditioning (A/C) off
- Gear selector in P or N
- Engine idling
- Go into diagnostic test menu.
Select leakage diagnostic
- Wait until the diagnostic is complete. This can take up to 2 minutes.
- Read off diagnostic trouble codes (DTCs)
Note!
If the text START CONDITIONS NOT MET or DIAGNOSTIC INTERRUPTED are displayed the diagnostics cannot be carried out. This can have several causes:
- high canister charge
- high tank pressure
- fuel trim not active
- a diagnostic trouble code (DTC) stored after the diagnostic has been activated. Check that no diagnostic trouble codes (DTCs) are stored, restart the car and try to activate the diagnostic again. Sometimes several attempts will have to be made before the diagnostic is carried out.
Does the diagnostic trouble code (DTC) reoccur?
Yes: Fault-tracing has failed! See service manual TP 2308202.
No: The fault is remedied.
Note!
When replacing the control module (ECM) the following procedures must be performed before it is returned to TMA (Technical Material Analysis):
* Attach the enclosed identity tag P/N 540426-4 to the ECM.
* Pack the ECM in a box, label the outside with the enclosed TMA-label P/N 6764776-8 (USA) or 514323-5 (CAN), and send it to TMA in Rockleigh or Toronto.
Other replaced materials, shall be returned by the repairing retailer to importer's TMA department.
WARRANTY STATEMENT: Claims may be submitted under the New Car Limited Warranty when a manufacturing defect is present using claim type: 01
Operation No. Labor description Time allowance
28456-2 Self-diagnosis reading 0.2 hr
28403-3 Control unit fuel system replace 0.1 hr