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 the BAS,ETS, ME and ETC systems. It is important to read out the DTC's from the BAS system first, since the DTC's from the other systems are stored in BAS during the diagnostic process. DTC readout is not possible using an impulse counter scan tool. In case of complaint, and no fault is present in system, perform 23 in its entirety.

DTC	Possible cause	Test step/Remedy 1)
	ESP/SPS control module (N47-5)	Replace control module.
	Battery voltage too low, circuit 87	23 1.0
	ASR/ETS/ESP hydraulic unit solenoid valve voltage supply, open/short circuit	23 2.0 23 22.0
	CAN communication faulty in general	23 30.0 Check version coding of ME control module, using HHT. Check version coding of ETC control module, using HHT.
	CAN communication with engine control module (ME-SFI, N30/10) or right engine control module (ME-SFI, N3/12), interrupted	23 30.0 Read out DTC (ME-SFI) memory, see DM, Engines, Vol. 4, section 9 >12. Check version coding of ME control module, using HHT.
	CAN communication with left engine control module (ME-SFI, N3/11), interrupted	23 30.0 Read out DTC (ME-SFI) memory, see DM, Engines, Vol. 4, section 9 12. Check version coding of ME control module, using HHT.
	CAN communication with transmission control module (N15/3), interrupted	Read out DTC (ETC [722.6]) memory , see DM, C&D, Vol. 1, section 2.3 12. Check version coding of ME control module, using HHT.
	Left front axle VSS sensor (L6/1), open circuit Left front axle VSS sensor (L6/1), loose contact Left front axle VSS sensor (L6/1), implausible 2)	23 13.0
	Right front axle VSS sensor (L6/2), open circuit Right front axle VSS sensor (L6/2), loose contact Right front axle VSS sensor (L6/2), implausible 2)	23 15.0
	Left rear axle VSS sensor (L6/3), open circuit Left rear axle VSS sensor (L6/3), loose contact Left rear axle VSS sensor (L6/3), implausible 2)	23 17.0
	Right rear axle VSS sensor (L6/4), open circuit Right rear axle VSS sensor (L6/4), loose contact Right rear axle VSS sensor (L6/4), implausible 2)	23 19.0
	ESP yaw sensor (N64) signal wire, open/short circuit ESP yaw sensor (N64) reference wire, open/short circuit	23 28.0
	Steering angle sensor (N49), open/short circuit Steering angle sensor (N49), initialization	23 29.0
	ESP brake pressure sensor (B34)	23 9.0 23 27.0
	ABS lateral acceleration sensor (B24/2), open/short circuit	23 26.0
	Stop lamp switch (4-pole) (S9/1), open/short circuit Stop lamp switch (4-pole) (S9/1), implausible	23 6.0
	Left front axle solenoid valve (hold) (A7/3y6), open/short circuit	23 23.0
	Left front axle solenoid valve (release) (A7/3y7), open/short circuit	23 23.0
	Right front axle solenoid valve (hold) (A7/3y8), open/short circuit	23 23.0
	Right front axle solenoid valve (release) (A7/3y9), open/short circuit	23 23.0
	Left rear axle solenoid valve (hold) (A7/3y10), open/short circuit	23 23.0
	Left rear axle solenoid valve (release) (A7/3y11), open/short circuit	23 23.0
	Right rear axle solenoid valve (hold) (A7/3y12), open/short circuit	23 23.0
	Right rear axle solenoid valve (release) (A7/3y13), open/short circuit	23 23.0
	Front axle precharge solenoid valve (A7/3y16), open/short circuit	23 24.0
	Rear axle precharge solenoid valve (A7/3y17), open/short circuit	23 24.0
	Front axle switchover valve (A7/3y18), open/short circuit	23 24.0
	Rear axle switchover valve (A7/3y19), open/short circuit	23 24.0
	Master brake cylinder switchover valve (Y61)	23 8.0
	ASR/ETS/ESP hydraulic unit, solenoid valve relay (A7/3k1)	Replace control module (N47-5)
	ASR/ESP charging pump (M15), open/short circuit	23 9.0
	ASR/ETS/ESP hydraulic unit, high-pressure/return pump (A7/3m1), open/short circuit ASR/ETS/ESP hydraulic unit, high-pressure/return pump (A7/3m1), does not turn off	23 10.0 23 11.0
	VSS (L6/1, L6/2, L6/3, L6/4) implausible 2)	23 13.0, 15.0, 17.0, 19.0
	SPS P-valve (Y10)	23 12.0
	Pressure transfer piston unit	Check condition of rear brake pads, Pressure transfer piston unit.
	System has turned off	Steering angle sensor (N49) not initialized 23 29.0 Low voltage to ESP yaw rate sensor (N64) 23 28.0

1) Observe Preparation for Test, see 22. 2) Rotor with incorrect tooth count, dirt accumulation on or damage to rotor, incorrect rear axle ratio, wrong wheel or tire size. If DTC appears only after repair work, it may be caused by applying the brakes or driving vehicle on a dynamometer, erase DTC.