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Diagnostic Manual, Engines, Volume 2

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 3.1 LH Sequential Multiport Fuel Injectin System (LH-SFI)   >   22 Preparation for Test

Electrical Test Program - Preparation for Test

Preliminary work:
Diagnosis - Diagnostic Trouble Code (DTC) Memory 11

Preparation for Test
1. Ignition: OFF
2. Remove LH-SFI control module (N3/1).
3. Connect socket box with contact module 140 589 02 63 00 and contact box to LH-SFI control module (N3/1) according to connection diagram.
4. Test steps 1.2, 1.3, 2.2 - 2.5, 4 and 36 only!
Ignition: OFF
Remove base module (N16/1) and connect socket box with contact module 140 589 01 63 00 and contact box to base module (see DM, Chassis and Drivetrain, Volume 1, section 1, 22).

When performing test and adjustment work, the engine rpm should only be raised using the accelerator pedal.
If the engine speed is raised via the control linkage in the engine compartment, the"limp-home" mode will bec activated and will be registered as a DTC in the EA/CC/ISC control module. The
ASR MIL will also come on.

If installing a LH-SFI control module from another vehicle, the control module's self-adaptation feature must be reset to its mean value (see 11 ).

Wiring diagrams:
Electrical Troubleshooting Manual, Models 124, 129, 140

Note regarding "Test Connection" column:
The numbers indicated in parentheses, for example, 1.0 (1.23) signify:
1= Connector 1 on wiring diagram,
23= Socket 23 on wiring diagram.

Conventional tools, test equipment

Description Brand, model, etc.
Multimeter 1) Fluke models 23, 83, 85, 87
Engine analyzer 1) Bear DACE (Model 40-960)
Sun MEA-1500MB
1) Available through the MBUSA Standard Equipment Program.