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Diagnostic Manual, Chassis and Drivetrain,
Volume 3

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LOCATION:    9.3 Traction Systems (ABS, ASR, ETS) and SPS   >   12 Diagnosis - Diagnostic Trouble Code (DTC) Memory


Diagnosis - Diagnostic Trouble Code (DTC) Memory

Preparation for DTC Readout


DTC readout is no longer possible using the impulse counter scan tool.

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


Test cables are not to be hooked up to the HHT while performing
function tests.


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.

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).
Traction system control module (N47) N47
Battery voltage too low, circuit 87 23 1.0
Voltage supply for ASR/ETS/ESP hydraulic unit (A7/3) solenoid valves,
short/open circuit
23 5.0
23 2.0
Battery voltage too high, circuit 87 23 1.0
CAN communication overall faulty Wiring.
CAN communication with EA/CC/ISC control module (N4/1) interrupted Read out DTC's from (N4/1).
CAN communication with engine control module (ME-SFI) (N3/10) interrupted Read out DTC's from (N3/10).
CAN communication with transmission control module (N15/3) interrupted Read out DTC's from (N15/3).
Left front axle VSS sensor (L6/1), open circuit
Left front axle VSS sensor (L6/1), loose connection
Left front axle VSS sensor (L6/1), implausible 2)
23 11.0
Right front axle VSS sensor (L6/2), open circuit
Right front axle VSS sensor (L6/2), loose connection
Right front axle VSS sensor (L6/2), implausible 2)
23 13.0
ETS/ASR:



ABS:
Left rear axle VSS sensor (L6/3), open circuit
Left rear axle VSS sensor (L6/3), loose connection
Left rear axle VSS sensor (L6/3), implausible 2)

Left axle VSS sensor (L6), open circuit
Left axle VSS sensor (L6), loose connection
Left axle VSS sensor (L6), implausible 2)
23 16.0



23 15.0


Right rear axle VSS sensor (L6/4), open circuit
Right rear axle VSS sensor (L6/4), loose connection
Right rear axle VSS sensor (L6/4), implausible 2)
23 19.0
Left front axle VSS sensor (L6/1), implausible 2) 23 11.0
Right front axle VSS sensor (L6/2), implausible 2) 23 13.0
ETS/ASR:
ABS:
Left rear axle VSS sensor (L6/3), implausible 2)
Rear axle VSS sensor (L6), implausible 2)
23 16.0
23 15.0
Right rear axle VSS sensor (L6/4), implausible 2) 23 19.0
ABS lateral acceleration sensor (B24/2), short/open circuit 23 8.0
ABS lateral acceleration sensor (B24/2), implausible 23 8.0
Stop lamp switch (S9/1) short/open circuit
S9/1 implausible
Wiring
S/91
Left front axle solenoid valve (hold) (A7/3y6),
short/open circuit
23 21.0
Left front axle solenoid valve (release) (A7/3y7),
short/open circuit
23 22.0
Right front axle solenoid valve (hold) (A7/3y8),
short/open circuit
23 23.0
Right front axle solenoid valve (release) (A7/3y9),
short/open circuit
23 24.0
Left rear axle solenoid valve (hold) (A7/3y10),
short/open circuit
23 25.0
23 26.0
Left rear axle solenoid valve (release) (A7/3y11),
short/open circuit
23 27.0
23 28.0
Right rear axle solenoid valve (hold) (A7/3y12),
short/open circuit
23 29.0
Right rear axle solenoid valve (release) (A7/3y13),
short/open circuit
23 30.0
Switchover/solenoid valve (A7/3y5), short/open circuit 23 31.0
Master brake cylinder switchover valve (Y61) 23 9.0
Solenoid valve relay (A7/3k1) N47
Solenoid valve relay (A7/3), voltage supply 23 5.0
23 2.0
Inlet solenoid valve (A7/3y15) 23 32.0
High pressure return pump (A7/3m1), short/open circuit
High pressure return pump (A7/3m1), will not shut off
23 6.0
VSS sensor implausible 2) 23 11.0, 13.0, 15.0, 16.0, 19.0
SPS P-valve (Y10) 23 7.0
ETS/SPS control module (N47-2), not version coded N47-2
Brakes overheated Brakes were momentarily overloaded, erase DTC.
ASR/SPS (N47-1) OR ME-SFI (N3/10), engine control module, version coding incorrect N47-1
N3/10
SPS P-valve (Y10), adjustment data 23 7.0
N47
Version coding, SPS N47
Temperature after engine is turned off N47
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.