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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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20
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FUEL QUANT. SENS.
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Engine running at idle
speed, operating temperature
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2.3 to 2.7 V
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61, 64
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21, 39, 14
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Switch off all consumers
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Trouble-shooting
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Nominal Value
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Cause of
Fault:
(If nominal
value is not attained)
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· Ignition OFF
· Disconnect wiring harness plug from DDE control
unit K70
· Ignition ON
· Using multimeter, measure voltage
from: wiring harness plug for DDE
control unit K70 Ter. 21
to: ground
|
lower than 0.1 V
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· Short circuit to voltage
from: wiring harness plug for DDE
control unit K70 Ter. 21
to: wiring harness plug for
injection quantity sensor P68 Ter. 1
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· Short circuit to voltage
from: wiring harness plug for DDE
control unit K70 Ter. 39
to: wiring harness plug for
injection quantity sensor P68 Ter. 2
· Injection quantity sensor P68 defective
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· Ignition OFF
· Using multimeter, measure resistance
from: wiring harness plug for DDE
control unit K70 Ter. 21
to: ground
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greater than 100 kW (¥)
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· Short circuit to ground
from: wiring harness plug for DDE
control unit K70 Ter. 21
to: wiring harness plug for
injection quantity sensor P68 Ter. 1
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· Short circuit to ground
from: wiring harness plug for DDE
control unit K70 Ter. 14
to: wiring harness plug for
injection quantity sensor P68 Ter. 3
· Short circuit to ground
from: wiring harness plug for DDE
control unit K70 Ter. 39
to: wiring harness plug for
injection quantity sensor P68 Ter. 2
· Injection quantity sensor P68 defective
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|
· Using multimeter, measure resistance
from: wiring harness plug for DDE
control unit K70 Ter. 14
to: wiring harness plug for
DDE control unit K70 Ter. 21
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5.5 to 6.5 W
|
lower than 5.5 W:
· Short circuit in wiring harness
from: wiring harness plug for
injection quantity sensor P68 Ter. 1
to: wiring harness plug for
injection quantity sensor P68 Ter. 3
· Injection quantity sensor P68 defective
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greater than 6.5 W:
· Circuit interruption
from: wiring harness plug for DDE
control unit K70 Ter. 21
to: wiring harness plug for
injection quantity sensor P68 Ter. 1
· Circuit interruption
from: wiring harness plug for DDE
control unit K70 Ter. 14
to: wiring harness plug for
injection quantity sensor P68 Ter. 3
· Injection quantity sensor P68 defective
|
|
· Using multimeter, measure resistance
from: wiring harness plug for DDE
control unit K70 Ter. 14
to: wiring harness plug for
DDE control unit K70 Ter. 39
|
5.5 to 6.5 W
|
lower than 5.5 W:
· Short circuit in wiring harness
from: wiring harness plug for
injection quantity sensor P68 Ter. 2
to: wiring harness plug for
injection quantity sensor P68 Ter. 3
· Injection quantity sensor P68 defective
|
|
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greater than 6.5 W:
· Circuit interruption
from: wiring harness plug for DDE
control unit K70 Ter. 39
to: wiring harness plug for
injection quantity sensor P68 Ter. 2
· Circuit interruption
from: wiring harness plug for DDE
control unit K70 Ter. 14
to: wiring harness plug for
injection quantity sensor P68 Ter. 3
· Injection quantity sensor P68 defective
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If nominal values are attained
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· DDE control unit K70 defective
or
· Injection quantity sensor P68 defective
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Note:
The tests described above are static checks and not
real function checks. For this reason, it is possible that the measurements
are okay, but that the injection pump sensor still does not regulate
properly. The cause of this may be mechanical faults or faults in the circuit
of the pump actuator. Therefore, before replacing the control unit or the
injection pump, first check the pump actuator circuit for faults (see
parameter 21), and then perform a mechanical function check (see Service
Instructions). If the injection quantity regulation still does not function
correctly, the control unit or the injection pump must then be replaced.
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