A6 Sedan V6-2.8L (AHA) (1998)
Rough Road Sensor: Testing and Inspection
Rough road signal from ABS/EDL control module, checking
NOTE:
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When the ABS/EDL control module senses wheel spin, it produces the rough road signal. When the ECM recognizes the rough road signal, the
misfire recognition is switched off.
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Check the rough road signal only when the DTC 18014 "Rough Road Spec Engine Torque ABS-ECU Electrical Malfunction" is stored. The
possible "Misfire" malfunction is in this case a subsequent malfunction that can be disregarded.
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The wiring and the rough road signal are monitored by the ECM.
Required special tools and test equipment
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VAG 1551 or VAG 1552 Scan Tool (ST) with VAG 1551/3 adapter cable
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VAG 1598/22 test box
Test requirements
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ECM coding OK
Test sequence
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Switch ignition off.
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Connect VAG 1598/22 test box to ECM harness connector.Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting
VAG 1598/22 Test Box" See: Computers and Control Systems/Testing and Inspection
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Check signal wiring between ECM/test box terminal 45 and ABS control module for short circuit or open circuit.
If the wiring is OK:
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Replace ABS control module.
If the malfunction occurs again after the ABS control module has been replaced:
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Replace Motronic ECM -J220-.
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Carry out adaptation of throttle valve control module to ECM.
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Check readiness code. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code.
Refer to "Moniters, Trips and/or Drive Cycle (Readiness Codes)/Checking Readiness Code" See: Computers and Control Systems/Testing and
Inspection Refer to "Moniters, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code See: Computers and Control
Systems/Testing and Inspection