Preparation for DTC Readout

1. Review section 0 2. Additionally review 21, 22, 23(connector connections). 3. Connect Hand-Held Tester (HHT) to data link connector (X11/4) according to connection diagram (see section 0). 4. Ignition: ON 5. 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. 6. Perform actual/nominal values comparison. 7. Perfrom activations. 8. Follow-up and repair displayed DTCs. 9. After successful repairs, erase all DTCs. DTC readout is no longer possible using the 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)
-	No fault in system	In case of complaint: 23 (entire test).
	ETS/SPS control module (N47-2)	ETS/SPS control module (N47-2).
	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 14.0, 2.0
	Battery voltage too high, circuit 87	23 1.0
	CAN communication overall faulty	Wiring, 23 3.0
	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 7.0
	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 9.0
	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)	23 11.0
	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 13.0
	Left front axle VSS sensor (L6/1), implausible 2)	23 7.0
	Right front axle VSS sensor (L6/2), implausible 2)	23 9.0
	Left rear axle VSS sensor (L6/3), implausible 2)	23 11.0
	Right rear axle VSS sensor (L6/4), implausible 2)	23 13.0
	Stop lamp switch (S9/1) short/open circuit Stop lamp switch (S9/1) implausible	Wiring, S/91
	Left front axle solenoid valve (hold) (A7/3y6), short/open circuit	23 15.0
	Left front axle solenoid valve (release) (A7/3y7), short/open circuit	23 16.0
	Right front axle solenoid valve (hold) (A7/3y8), short/open circuit	23 17.0
	Right front axle solenoid valve (release) (A7/3y9), short/open circuit	23 18.0
	Left rear axle solenoid valve (hold) (A7/3y10), short/open circuit	23 19.0
	Left rear axle solenoid valve (release) (A7/3y11), short/open circuit	23 20.0
	Right rear axle solenoid valve (hold) (A7/3y12), short/open circuit	23 21.0
	Right rear axle solenoid valve (release) (A7/3y13), short/open circuit	23 22.0
	Front axle switchover valve (A7/3y18), short/open circuit	23 23.0
	Rear axle switchover valve (A7/3y19), short/open circuit	23 24.0
	Solenoid valve relay (A7/3k1)	ETS/SPS control module (N47-2)
	Solenoid valve relay (A7/3k1), voltage supply	23 14.0, 1.0
	Rear axle inlet solenoid valve (A7/3y23)	23 26.0
	Front axle inlet solenoid valve (A7/3y22)	23 25.0
	High pressure return pump (A7/3m1) short/open circuit High pressure return pump (A7/3m1) will not shut off	23 5.0
	VSS sensor implausible 2)	23 7.0, 9.0, 11.0, 13.0
	SPS P-valve (Y10)	23 6.0
	ETS/SPS control module (N47-2) not version coded	ETS/SPS control module (N47-2)
	Brakes overheated	Brakes were momentarily overloaded, erase DTC.
	ME-SFI (N3/10) engine control module, version coding incorrect	N3/10
	SPS P-valve (Y10) adjustment data	23 6.0 ETS/SPS control module (N47-2)
	Version coding SPS	ETS/SPS control module (N47-2)
	Temperature after engine is turned off	ETS/SPS control module (N47-2)

1) Observe Preparation for Test 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.