|
No.
|
TECH 1 Display
|
Conditions for
Checking
|
Nominal Value
|
Trouble Codes
|
Terminal
|
|
04
|
FR WHEEL SPEED
|
Ignition ON
With vehicle jacked up, slowly turn front right wheel by
hand
|
approx. 5.0 km / h (3.0 MPH)
|
25, 39, 41, 42, 43
|
10, 12
|
|
|
|
or
drive vehicle
|
or
TECH 1 display approx. the same as speedometer display
|
|
|
|
Notes for Trouble - shooting:
|
Nominal Value:
|
Cause of Fault:
|
|
Front left wheel speed sensor:
· Ignition OFF
· Disconnect plug
X 25P from control unit U. 4.8
· Connect ohmmeter
between plug X 25P / Ter. 8 and Ter. 20
· Move cable to and
fro by hand, especially in area of wheel well
|
|
|
|
· Ensure that
measured value remains constant
|
0.8 to 1.7 kW
|
· Plug
connection X 2P of front left wheel speed sensor P 17 defective
|
|
|
|
· Loose
contact between plug connection X 2P and front left wheel speed sensor
P 17
· Lead
interruption from control unit U 4.8 / X 25P / Ter. 8 or
Ter. 20 to plug connection X 2P of front left wheel speed sensor
P 17
|
|
· Connect ohmmeter
between plug X 25P / Ter. 8 and ground or X 25P / Ter. 20
and ground
|
infinite W
|
· Shielding
of front left wheel speed sensor P 17 defective
|
|
· Set voltmeter to alternating
voltage
· Connect voltmeter
to control unit plug U 4.8 / X 25P / Ter. 8 and Ter. 20
· Turn front left
wheel approx. 1 revolution per second
|
greater than 30 mV (alternating voltage)
|
· Lead
interruption between plug X 2P and front left wheel speed sensor
P 17
|
|
Front right wheel speed sensor:
· Ignition OFF
· Disconnect plug
X 25P from control unit U.4.8
· Connect ohmmeter
between plug X 25P / Ter. 10 and Ter. 12
· Move cable to and
fro by hand, especially in area of wheel well
· Ensure that
measured value remains constant
|
0.8 to 1.7 kW
|
· Plug
connection X 2P of front right wheel speed sensor P 18 defective
· Loose
contact between plug connection X 2P and front right wheel speed sensor
P 18
· Lead
interruption from control unit U 4.8 / X 25P / Ter. 10 or
Ter. 12 to plug connection X 2P of front right wheel speed sensor
P 18
|
|
· Connect ohmmeter
between plug X 25P / Ter. 10 and ground or X 25P / Ter.
12 and ground
|
infinite W
|
· Shielding
of front right wheel speed sensor P 18 defective
|
|
· Set voltmeter to alternating
voltage
· Connect
voltmeter to control unit plug U 4.8 / X 25P / Ter. 10
and Ter. 12
· Turn front left
wheel approx. 1 revolution per second
|
greater than 30 mV
(alternating voltage)
|
· Lead
interruption between plug X 2P and front right wheel speed sensor
P 18
|
|
|
|
|
|
|
|
|
|
|
|
