Function Test

WARNING: This page does not describe the selected car, but rather 34 other vehicles, including the 2002 Mercedes-Benz E430, 2002 Mercedes-Benz E320, 2001 Mercedes-Benz E430, 2001 Mercedes-Benz E320, and 2000 Mercedes-Benz E430. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: To avoid damaging control modules all electrical testing should be done with a DVOM. DO NOT use an analog meter or test light to check control module circuits.

NOTE: DTC readout is not possible using an impulse counter scan tool.

NOTE: Test cables are not to be hooked up to the HHT while performing component activation.

NOTE: The Electrical Test Program, see ANTI-LOCK BRAKE SYSTEM (ABS), ACCELERATION SLIP REGULATION (ASR), ELECTRONIC TRACTION SYSTEM (ETS) & SPEED SENSITIVE POWER STEERING (SPS) ELECTRICAL TESTS PROGRAM (SECTION 23) , pertains to ABS, ASR, ETS, and SPS systems. In order to prevent the listing of all the control modules used in the various systems, for each test step, "N47" is used for control modules for traction systems and "A7/3" is used for hydraulic unit for traction systems.

Connect the HHT to the data link connector (X11/4) according to connection diagram. See Figure - Figure . Turn ignition ON. Read out the DTC memory. Read out Nominal/actual value displays. Perform component activations. Perform repairs according to DTC memory readout. After completing repairs erase DTC memory.

Read out DTC memory from ABS, ASR, or ETS control modules before starting repair procedures. DTC memory must also be read out from ME-SFI and EA control modules on vehicles with ASR. The HHT will indicate the defective components in the display or will refer to the proper test step.

When swapping ETS control modules, the ETS control module must be version coded using the HHT. Follow the directions as indicated in the display of the HHT. By using the test button "?" on the HHT, the version code of the control module will be displayed.

Use function test to determine which system test to perform. See Fig 1. If problem is identified, perform appropriate test step under ANTI-LOCK BRAKE SYSTEM (ABS), ACCELERATION SLIP REGULATION (ASR), ELECTRONIC TRACTION SYSTEM (ETS) & SPEED SENSITIVE POWER STEERING (SPS) ELECTRICAL TESTS PROGRAM (SECTION 23) . If problem is not identified, continue diagnosis. See SYMPTOM INDEX .

Fig 1: Identifying Function Test

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