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No.
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TECH 1 Display
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Conditions for
Checking
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Nominal Value
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Trouble Codes
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Terminal
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|
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16
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VEHICLE SPEED
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Vehicle travelling at approx. 50 km/h (30 mph)
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TECH 1 display approximately the same as speedo- meter
display
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24
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29,
13
|
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Note:
Before performing this test, ensure that the signal input
at the ABS control unit from the "rear left" wheel speed sensor is
supplying plausible values, and that trouble codes 44 and 45 are not set in
the ABS-2SH. If the "rear left" wheel speed sensor does not supply
a signal or one of these trouble codes is stored, start trouble-shooting as
specified in the "Anti-lock Brake System ABS-2SH" Checking
Procedures.
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Notes on Trouble-shooting:
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Nominal Value:
|
Cause of fault:
(If nominal value is not
attained)
|
|
· Raise vehicle
· Ignition OFF
· Disconnect wiring harness plug from
DDE 2.1 control unit K70
· Ignition ON
· Using multimeter, measure voltage
from: wiring
harness plug for DDE 2.1 control unit K70 Ter. 29
to: ground
· Slowly turn rear left wheel
|
changes between
less than 1 V
greater than 8.5 V
|
If nominal value is attained:
· DDE 2.1 control unit K70 defective
|
|
|
Important:
If the rear wheel is turned too fast,
the following average value emerges
|
greater than 4V
|
If nominal value is not attained:
· Perform next test
|
|
|
· Ignition OFF
· Disconnect wiring harness plug from
radio H1
· Ignition ON
· Using multimeter, measure voltage
from: wiring
harness plug for DDE 2.1 control unit K70 Ter. 29
to: ground
· Slowly turn rear left wheel
|
changes between
less than 1 V
greater than 8.5 V
|
If nominal value is attained:
· Radio H1 defective
If nominal value is not attained:
· Perform next test
|
|
|
· Ignition OFF
· Disconnect wiring harness plug from
warning buzzer H27 (Saudi Arabia only)
· Ignition ON
· Using multimeter, measure voltage
from: wiring
harness plug for DDE 2.1 control unit K70 Ter. 29
to: ground
· Slowly turn rear left wheel
|
changes between
less than 1 V
greater than 8.5 V
|
If nominal value is attained:
· Warning buzzer H27 defective
If nominal value is not attained:
· Perform next test
|
|
|
· Ignition OFF
· Disconnect wiring harness plug from
Servotronic control unit K41
· Ignition ON
· Using multimeter, measure voltage
from: wiring
harness plug for DDE 2.1 control unit K70 Ter. 29
to: ground
· Slowly turn rear left wheel
|
changes between
less than 1 V
greater than 8.5 V
|
If nominal value is attained:
· Servotronic control unit K41 defective
If nominal value is not attained:
· Perform next test
|
|
|
· Ignition OFF
· Disconnect wiring harness plug from sun
roof motor M61
· Ignition ON
· Using multimeter, measure voltage
from: wiring
harness plug for DDE 2.1 control unit K70 Ter. 29
to: ground
· Slowly turn rear left wheel
|
changes between
less than 1 V
greater than 8.5 V
|
If nominal value is attained:
· Sun roof motor M61 defective
If nominal value is not attained:
· Perform next test
|
|
|
· Ignition OFF
· Disconnect wiring harness plug from
instrument P43 (speedometer)
· Ignition ON
· Using multimeter, measure voltage
from: wiring
harness plug for DDE 2.1 control unit K70 Ter. 29
to: ground
· Slowly turn rear left wheel
|
changes between
less than 1 V
greater than 8.5 V
|
If nominal value is attained:
· Instrument P43 defective
If nominal value is not attained:
· Perform next test
|
|
|
· Ignition OFF
· Disconnect wiring harness plug from
MID/ TID control unit U16/ U15
· Ignition ON
· Using multimeter, measure voltage
from: wiring
harness plug for DDE 2.1 control unit K70 Ter. 29
to: ground
· Slowly turn rear left wheel
|
changes between
less than 1 V
greater than 8.5 V
|
If nominal value is attained:
· TID/ MID control unit U15/ U16
defective
If nominal value is not attained:
· Perform next test
|
|
|
· Ignition OFF
· Disconnect wiring harness plug from ABS
control unit U4.8
· Ignition ON
· Using multimeter, measure voltage
from: wiring
harness plug for DDE 2.1 control unit K70 Ter. 29
to: ground
|
lower than 0.1 V
|
· Short circuit to voltage
from: wiring
harness plug for ABS control unit U4.8 Ter. 6
to: wiring
harness plug for DDE 2.1 control unit K70 Ter. 29
or
to: wiring
harness plug of one of the previously mentioned systems H1 Ter. 5, H27
Ter. 2, K41 Ter. 4, M61 Ter. 6, P43 Ter. 19, U15/ U16
Ter. 12 (26 P)
|
|
|
· Using multimeter, measure resistance:
from: wiring
harness plug for DDE 2.1 control unit K70 Ter. 29
to: ground
|
greater than 100 kW
(¥)
|
· Short circuit to ground
from: wiring
harness plug for ABS control unit U4.8 Ter. 6
to: wiring
harness plug for DDE 2.1 control unit K70 Ter. 29
or
to: wiring
harness plug of one of the previously mentioned systems H1 Ter. 5, H27
Ter. 2, K41 Ter. 4, M61 Ter. 6, P43 Ter. 19, U15/ U16
Ter. 12 (26 P)
|
|
|
· Using multimeter, measure resistance:
from: wiring
harness plug for DDE 2.1 control unit K70 Ter. 29
to: wiring
harness plug for ABS control unit U4.8 Ter. 6
|
lower than 2 W
|
· Circuit interruption
from: wiring
harness plug for ABS control unit U4.8 Ter. 6
to: wiring
harness plug for DDE 2.1 control unit K70 Ter. 29
|
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If nominal values are attained
|
· ABS control unit U4.8 defective
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