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No.
|
TECH 1 Display
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Conditions for
Checking
|
Nominal Value
|
Trouble Codes
|
Terminal
|
|
|
19
|
FUEL
PUMP RELAY
|
Ignition ON
|
|
53,
54
|
3,
24
|
|
|
|
|
Wait a few seconds
|
INACTIVE 12V
|
|
|
|
|
|
|
Engine running at idle speed
|
ACTIVE 0V
|
|
|
|
|
Note:
Vehicles with ATWS and / or immobilizer systems can
only be checked with the ATWS and / or immobilizer systems switched OFF
|
|
Notes on Trouble - shooting:
|
Nominal Value:
|
Cause of Fault:
|
|
|
· Ignition OFF
· Disconnect fuel pump relay K 44 Using
multimeter, measure voltage at relay base Ter. 2 to ground.
|
11.5 to 13.5 V
|
· Short circuit or lead interrupti on
from - fuel pump relay K 44 / Ter. 2 to Ter. 30
|
|
|
· Ignition ON Using multimeter, measure
voltage at relay base Ter. 6 to ground.
|
11.5 to 13.5 V
|
· Short circuit or lead interruption from
- fuel
pump relay K 44 / Ter. 6 to injectors relay K 43 / Ter. 8
|
|
|
· Ignition OFF
· Disconnect control unit K 61
· Using multimeter, check from relay base
Ter. 4 to control unit K 61 / Ter. 3 for passage
|
approx. 0 W
|
· Short circuit or lead interruption from
fuel pump relay K 44 / Ter. 4 to Motronic control unit K 61 / Ter. 3
|
|
|
· Bridge relay base Ter. 2 and Ter. 6
· Using multimeter, measure voltage at
control unit plug Ter. 37 to ground.
|
11.5 to 13.5 V
|
· Short circuit or lead interruptio n
from control unit K 61 / Ter. 37
- fuel
pump relay K 44 / Ter. 8
- injectors
Y 7 - 1 to Y 7 - 4
- tank
vent valve Y 34
- hot
film mass air flow meter P 44 / Ter. 3
- exhaust
gas recirculati on valve Y 18
- air
conditioning
|
|
|
· Check fuel pressure (observe safety
regulations)
· Install pressure gauge in feed
· Bridge relay base Ter. 2 and Ter. 8
|
Feed pressure: 2.5 to 3.0 bar
|
· Fuse F 18 defective
· Short circuit or lead interruption from
- fuel
pump relay K 44 / Ter. 8 to fuse F 18 or oxygen sensor heating P 32
- fuse
F 18 to fuel pump M 21
· Fuel tank empty
|
|
|
· Using mltimeter, check from Motronic
control unit plug K 61 / Ter. 24 to ground
|
approx. 0 W
|
· Short circuit or lead interruption from
Motronic control unit K 61 / Ter. 24 to ground
· Fuel pump relay K 44 defective
· Fuel pump M 21 defective
· ATWS defective (if present)
· Immobilizer defective (if present)
· Control unit K 61 defective
|
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