|
No.
|
TECH 1 Display
|
Conditions for
Checking
|
Nominal Values
|
Trouble Codes
|
Terminal
|
|
|
21
|
VEHILE SPEED
|
Vehicle travelling at a constant speed of approx.
50 km/h (30 MPH)
|
TECH 1 display
approx.
MID display (speed)
|
-
|
X
20
20/13
|
|
|
Notes for Trouble-shooting:
|
Nominal Value:
|
Cause of Fault:
(If nominal value is not attained)
|
|
· Ignition OFF
· Disconnect plug X 21 from instrument
· Ignition ON
· Measure voltage between X 21/Ter. 9 and
X 21/Ter. 4:
|
> 11 volts
|
· Check fuse F 7
· Lead between F 7 and instrument is
interrupted
· Lead between F 7 and instrument has
short circuit to ground
· Lead between instrument and ground is
interrupted
|
|
|
|
If nominal value is attained:
|
|
· Pulse to ground in instrument
wiring harness plug X 21/Ter. 3:
|
> 0 km/h
|
· Instrument defective
· Speedometer cable defective
· Check connection of speedometer cable
in manual or automatic transmission
|
|
|
|
If nominal value is attained:
|
|
· If nominal value is attained:
· Ignition OFF
· Disconnect radio plug X 69 from radio
H 1
· Ignition ON
· Pulse to ground in instrument
wiring harness plug X 21/Ter. 3:
|
> 0 km/h
|
· Radio H1 defective
|
|
|
|
If nominal value is attained:
|
|
· Ignition OFF
· Disconnect plug from engine control
unit (Multec or Motronic)
· Ignition ON
· Pulse to ground in instrument
wiring harness plug X 21/Ter. 3:
|
> 0 km/h
|
· Fault in engine management circuit (see
corresponding Checking Procedures)
|
|
|
|
If nominal value is not attained:
|
|
· Ignition OFF
· Disconnect plug X 20 from MID
· Ignition ON
· Raise vehicle
· Transmission in neutral
· Slowly turn both front wheels
· Measure voltage between X 20/Ter. 20
and ground:
|
alternates between < 1 volt and > 9 volts
|
· Lead from X 21/Ter. 3 to X 69/Ter.
5, engine control unit and X 20 /Ter. 20 has short circuit to voltage
|
|
· Ignition OFF
|
|
|
|
· Measure resistance between instrument
wiring harness plug X 21/Ter. 3 and X 20/Ter. 20:
|
< 1 W
|
· Lead from X 21/Ter. 3 to X 20/Ter.
20 is interrupted
|
|
· Measure resistance between X 21/Ter. 3
and ground:
|
¥
|
· Lead from X 21/Ter. 3 to X 69/Ter.
5, engine control unit and X 20 /Ter. 20 has short circuit to ground
|
|
· If nominal values are attained
|
|
· MID defective
|
|
|
|
|
|
|
|
|
|
