Preparation for DTC Readout

WARNING! Life threatening injures possible due to vehicle slipping or toppling off while on lift. Prior to lift vehicle completely (wheels still in contact with floor), ensure that the vehicle is cntered within the lift columns and lift arm supports are correctly placed unto the vehicle contact points. 1. Review 11/1 before continuing work. 2. Review section 13, 21, 22, 23 3. Connect Hand-Held Tester (HHT) to data link connector (X11/4) according to connection diagram (see section 0). Read out DTC memory. 4. Ignition: ON 5. Read out DTC memory for the BAS, ETS, ME and ETC systems. DTC readout is not possible using an impulse counter scan tool. DTC s, Actual values, and activation for the BAS system are contained within the HHT menu: ESP Control module adaption: After replacing either the ESP/SPS control module (N47-5) or the brake booster (A7/7), it is absolutely necessary to perform an adaption of the ESP/SPS conmtrol module (N47-5) as well. The ESP/SPS control module (N47-5) has to learn the values for the BAS solenoid valve (A7/7y1), see HHT menu. In case of complaint, and no fault is present in system, perform 23 in its entirety.

DTC	Possible cause	Test step/Remedy 1)
-	No fault in system.	In case of complaint: ESP and SPS, 23, perform entire test
	ESP/SPS control module (N47-5) 3)	Replace N47-5
	ESP/SPS control module (N47-5) BAS processor faulty 3)	Replace N47-5
	Battery voltage too low, circuit 87	23 1.0
	Solenoid valve voltage supply, open/short circuit	23 2.0, 17.0
	Battery voltage too high, circuit 87	23 1.0
	CAN communication faulty in general	23 36.0
	CAN communication with right engine control module (ME-SFI, N3/12), interrupted	23 36.0 Read DTC (ME-SFI) memory, see DM, Engines, Vol. 4, section 9 12. Check version coding of ME control module, using HHT.
	CAN communication with BAS control module (N48), interrupted 3)	Replace N47-5
	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 8.0
	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 10.0
	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 12.0
	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 14.0
	ESP yaw sensor (N64) signal wire, open/short circuit ESP yaw sensor (N64) reference wire, open/short circuit	23 32.0
	Steering angle sensor (N49), open/short circuit Steering angle sensor (N49), initialization	23 6.0 Turn steering wheel from left to right stops.
	ESP brake pressure sensor (B34), open/short circuit ESP brake pressure sensor (B34), plausibility	23 31.0
	ABS lateral acceleration sensor (B24/2), open/short circuit ABS lateral acceleration sensor (B24/2), voltage supply ABS lateral acceleration sensor (B24/2), plausibility	23 30.0
	ESP brake pressure sensor (B34), voltage supply ABS lateral acceleration sensor (B24/2), voltage supply Membrane travel sensor (A7/7b1), voltage supply	23 31.0, N47-5 23 30.0, N47-5 23 34.0, N47-5
	Stop lamp switch (S9/1), plausibility of membrane travel comparison Stop lamp switch (S9/1), plausibility	Wiring, S9/1
	Release switch (A7/7s1) (BAS), open/short circuit Release switch (A7/7s1) (BAS), plausibility Release switch (A7/7s1) (BAS), redundance, switch over time	Wiring, A7/7s1 3)
	Membrane travel sensor (A7/7b1) (BAS), membrane speed Membrane travel sensor (A7/7b1) (BAS), plausibility Membrane travel sensor (A7/7b1) (BAS), open circuit Membrane travel sensor (A7/7b1) (BAS), wiring has short to ground	23 34.0
	Left front axle solenoid valve (hold) (A7/3y6), open/short circuit	23 18.0
	Left front axle solenoid valve (release) (A7/3y7), open/short circuit	23 19.0
	Right front axle solenoid valve (hold) (A7/3y8), open/short circuit	23 20.0
	Right front axle solenoid valve (release) (A7/3y9), open/short circuit	23 21.0
	Left rear axle solenoid valve (hold) (A7/3y10), open/short circuit	23 22.0
	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 24.0
	Right rear axle solenoid valve (release) (A7/3y13), open/short circuit	23 25.0
	Front axle inlet solenoid valve (A7/3y22), open/short circuit	23 26.0
	Rear axle inlet solenoid valve (A7/3y23), open/short circuit	23 27.0
	Front axle switchover valve (A7/3y18), open/short circuit	23 28.0
	Rear axle switchover valve (A7/3y19), open/short circuit	23 29.0
	Solenoid valve (BAS) (A7/7y1) 3) , open/short circuit	23 35.0
	High-pressure/return pump (A7/3m1), open/short circuit High-pressure/return pump (A7/3m1), does not turn off High-pressure/return pump (A7/3m1), shuts off too quickly	23 4.0
	Brake booster (BAS) (A7/7), booster faulty Brake booster (BAS) (A7/7): membrane travel sensor (BAS) (A7/7b1) or solenoid valve (BAS) (A7/7y1) are faulty	A7/7 3) 23 34.0 23 35.0
	VSS (L6/1, L6/2, L6/3, L6/4) implausible 2)	23 8.0, 10.0, 12.0, 14.0
	SPS P-valve (Y10)	23 5.0
	System has turned off Steering angle sensor (N49), initialization needs to be performed. Low voltage at ESP yaw rate sensor (N64) ESP brake pressure sensor (B34) faulty	Turn steering wheel from left ro right stops. 23 32.0 23 31.0

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. 3) When replacing any components, perform control module adaption, see 12/1