A4 Quattro Sedan L4-1.8L Turbo (AEB) (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 a wheel spinning, 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 trouble code 18014 "Rough Road Spec Engine Torque ABS-ECU Electrical Malfunction" is stored.
The "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.
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Emissions testing on a front-wheel drive vehicle with ABS/EDL, during which only the front wheels turn while the rear wheels are stationary, can
result in the DTC 18014 being stored in DTC memory. Therefore, the fuse for the ABS/EDL control module must be removed. After the test,
check DTC memory for the ABS/EDL control module and the ECM. Then erase DTC memory.
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. Refer to "Programming Control Module (ECM), (Function 07)" See: Computers and Control Systems/Testing and Inspection
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 1551/1552 Scan Tool" See: Computers and Control Systems/Testing and Inspection
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Check signal wiring for short circuit or open circuit between ECM/test box and ABS control module, according to wiring diagram.
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.
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Code)/Displaying Readiness Code" See: Computers and Control Systems/Testing and
Inspection
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Code)/Generating Readiness Code" See: Computers and Control Systems/Testing and
Inspection