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Diagnostic Manual, Chassis and Drivetrain,
Volume 3

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LOCATION:    10.2 ESP, BAS, SPS   >   13 Diagnosis - Complaint Related Diagnostic Chart


Diagnosis - Complaint Related Diagnostic Chart

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 centered within the lift columns and lift arm supports are correctly placed unto the vehicle contact points.

Preparation for Test:

1. Review section 0, 13, 21, 22, 23
2. Review Important Data Charts on pages 13/2, 13/3, 13/4

Complaint/Problem Possible cause Test step/Remedy 1)
ESP MIL (A1e42) or ABS MIL (A1e17) illuminates with engine running.   Read DTC memory,
12
BAS/ESP MIL (A1e47) or ABS MIL (A1e17) illuminates while driving and does not go out   Read DTC memory,
12
ESP MIL (A1e42) or ABS MIL (A1e17) illuminates while driving and then goes out Vehicle system voltage < 11 V, too many electrical consumers in use. Check generator (G2),
Read DTC memory,
12
ESP MIL (A1e42) or ABS MIL (A1e17) does not illuminate with ignition turned on Lamp,
Wiring.
Read DTC memory,
12
Read DTC memory for instrument cluster, using HHT
ABS MIL (A1e17) comes on with engine running after brake test or dynamometer use Implausible wheel speed signal due to different rpm at front and rear axles. Read, erase DTC memory
12
ESP MIL (A1e42) illuminates after the following causes (see Possible Causes) and upon DTC read-out using the HHT, the DTC is displayed Driving through steep turning curves,
Vehicle collision,
Vehicle spin-out on slippery road surfaces,
as a result: the DTC can be ignored.
Read, erase DTC memory
ESP MIL (A1e42) illuminates and after reading-out the DTC's via the HHT, the DTC and at least one additional DTC between and is/are displayed. Short circuit in more then one of the solenoid valves of the hydraulic unit or
short in the wiring harness


If two of the solenoid valves have a short circuit, then the voltage supply to all the solenoid valves is shut-off.
Check all the solenoid valves of the hydraulic unit along with the corresponding wiring for solenoid valves for any short circuits.
1) Observe Preparation for Test, see 22.

CAN signal Type of Information
ABS/ETS/ESP status Brake pad wear sensor indicator lamp
Parking brake warning lamp
ABS MIL
System fault or diagnostics
Stop lamp switch (S9/1):
Brake pedal not pressed,
Brake pedal depressed,
No signal
Cruise control OFF
ABS/ETS/ESP functions OK
ABS/ETS/ESP function OFF
Left front wheel speed signal Wheel rpm
Right front wheel speed signal Wheel rpm
Left rear wheel speed signal Wheel rpm
Right rear wheel speed signal Wheel rpm
Left front wheel speed signal for cruise control Wheel rpm
Right front wheel speed signal for cruise control Wheel rpm
CAN signal Type of Information
ABS status Cruise control function OFF
ABS/ETS/ESP functions OK
ABS/ETS/ESP function OFF
System fault or diagnostics
ETS/ASR/ESP status Brake pad wear sensor indicator lamp
Parking brake warning lamp
ABS MIL
ETS/ASR/ESP MIL
ASR/ESP OFF MIL
Wheel spin or ASR/ESP active (MIL blinks)
Stop lamp switch (S9/1):
Brake pedal not pressed,
Brake pedal depressed,
No signal
ASR request: "2nd gear start"
ASR request: "hold in gear"
Rapid ASR control function
Increase in: engine braking regulation (EBR)
Decrease in: engine braking regulation (EBR)
Cruise control OFF
ASR functions OK
ABS/ASR function OFF
System fault or diagnostics
Left front wheel speed signal Wheel rpm
Right front wheel speed signal Wheel rpm
Left rear wheel speed signal Wheel rpm
Right rear wheel speed signal Wheel rpm
Left front wheel speed signal for cruise control Wheel rpm
Right front wheel speed signal for cruise control Wheel rpm

CAN signal Type of Information From which control module
Engine status Engine rpm Engine control module
Engine status Required engine torque for traction control Engine control module
Engine status Atmospheric pressure Engine control module
Engine status Acknowledge engine moment request Engine control module
Engine status Accelerator Pedal value Engine control module
Engine status Indicated engine moment Engine control module
Engine status Engine friction moment Engine control module
Engine status Maximum engine moment Engine control module
Vehicle version code Model
Chassis
Engine
Transmission
Engine control module
Transmission status Actual gear
Requested gear
Electronic transmission control (ETC)
Transmission status Rear Drive
All wheel drive
Electronic transmission control (ETC)
Transmission status Intial shift request
Transmission in emergency limp-home-mode
Electronic transmission control (ETC)
Transmission code Large transmission
Small transmission
Electronic transmission control (ETC)
Transmission status Torque converter lock-up: "locked"
Torque converter lock-up: "unlocked"
Torque converter lock-up: "slip"
Electronic transmission control (ETC)