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Diagnostic Manual, Chassis and Drivetrain,
Volume 3

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LOCATION:    9.2 Traction Systems (ASR, ETS) and Speed-sensitive Power Steering (SPS)   >   12 Diagnosis - Diagnostic Trouble Code (DTC) Memory


Diagnosis - Diagnostic Trouble Code (DTC) Memory

Preparation for DTC Readout

1. Connect Hand-Held Tester (HHT) to data link connector (X11/4) according to connection diagram (see section 0).

2. Ignition: ON
3. Read out DTC memory for control modules.

DTC
Possible cause Test step/Remedy 1)
- No fault in system In case of complaint: 23 (entire test)
ASR/SPS (N47-1) or ETS/SPS (N47-2) control module Replace control module.
Left front axle VSS sensor (L6/1), open circuit 23 13.0
Right front axle VSS sensor (L6/2), open circuit 23 15.0
Left rear axle VSS sensor (L6/3), open circuit 23 17.0
Right rear axle VSS sensor (L6/4), open circuit 23 19.0
Left front axle VSS sensor (L6/1), implausible 2) 23 13.0
Right front axle VSS sensor (L6/2), implausible 2) 23 15.0
Left rear axle VSS sensor (L6/3), implausible 2) 23 17.0
Right rear axle VSS sensor (L6/4), implausible 2) 23 19.0
VSS (L6/1, L6/2, L6/3, L6/4), implausible 2) 23 13.0, 15.0, 17.0, 19.0
Visually inspect.
ASR/ETS hydraulic unit, solenoid valve relay (A7/3k1) 23 8.0
ASR/ETS hydraulic unit, left front axle solenoid valve (hold) (A7/3y6) 23 21.0
ASR/ETS hydraulic unit, left front axle solenoid valve (release) (A7/3y7) 23 22.0
ASR/ETS hydraulic unit, right front axle solenoid valve (hold) (A7/3y8) 23 23.0
ASR/ETS hydraulic unit, right front axle solenoid valve (release) (A7/3y9) 23 24.0
ASR/ETS hydraulic unit, left rear axle solenoid valve (hold) (A7/3y10) 23 25.0
ASR/ETS hydraulic unit, left rear axle solenoid valve (release) (A7/3y11) 23 26.0
ASR/ETS hydraulic unit, right rear axle solenoid valve (hold) (A7/3y12) 23 27.0
ASR/ETS hydraulic unit, right rear axle solenoid valve (release) (A7/3y13) 23 28.0
ASR/ETS hydraulic unit, switchover/solenoid valve (A7/3y5) 23 29.0
ASR/ETS hydraulic unit, inlet solenoid valve (A7/3y15) 23 30.0
ASR only: ASR system pressure too low ASR hydraulic unit (A7/3)
ASR/ETS hydraulic unit, high-pressure/return pump relay (A7/3k2) 23 9.0
High-pressure/return pump (A7/3m1)
Stop lamp switch (S9/1) 23 11.0
Battery voltage too low, circuit 87 23 1.0
ETS only: Circuit 30, voltage supply 23 2.0
ASR only: CAN communication with EA/CC/ISC control module (N4/1), faulty 23 33.0
Read out DTC (N4/1), see DM, Engines, Vol. 3, section 6.4 >11.
ASR only: CAN communication with engine control module (N3/4), faulty 23 33.0,
Read out DTC (N3/4), see DM, Engines, Vol. 2, section 1.1 >11.
ASR only: CAN communication, faulty in general 23 33.0,
Read out DTC (N4/1), see DM, Engines, Vol. 3,
section 6.4 >11 (ASR).

Read out DTC (N3/4), see DM, Engines, Vol. 2,
section 1.1 >11 (HFM-SFI).
ETS only: Brakes overheated Brakes were momentarily overloaded, erase DTC.
ETS only: ETS/SPS control module (N47/2) not coded Input code data into control module with HHT.
210 only: ASR/ SPS (N47-1) or ETS/SPS (N47-2) control module N47-1 or N47-2
210 only: ASR/ SPS (N47-1) or ETS/SPS (N47-2) control module N47-1 or N47-2
1) Observe Preparation for Test, see 22.
2) Rotor with incorrect tooth count, dirt accumulation on or damaged rotor, incorrect rear axle ratio, wrong wheel or tire size.
If DTC appears only after repair work, it was caused by applying the brakes or driving vehicle on a dynamometer, erase DTC.