|
Test
Step
No.
|
Test Equipment
Multimeter MKM-587-A
|
Check of
|
Terminal
|
Notes
|
Nominal Values
|
Possible Cause of
Fault,
Trouble -
shooting
|
|
|
1
|
Ohmmeter
|
Diagnostic plug (ALDL):
ground
|
4 / ground
or
5 / ground
|
Ignition OFF
|
approx. 0 W
|
· Transfer
resistance at grounding point too high
|
|
|
2.1
|
Ohmmeter
|
Diagnostic plug (ALDL):
excitation lead
|
X D / Ter. 6
and
K 61 / Ter. 13
|
Ignition OFF
|
approx. 0 W
|
· Lead
interruption between X D / Ter. 6 and K 61 /
Ter. 13
|
|
|
2.2
|
Ohmmeter
|
Diagnostic plug (ALDL):
excitation lead
|
X D / Ter. 6 and
ground
|
Ignition OFF
|
infinite W
|
· Short
circuit to ground
· Control
unit K 61 defective
|
|
|
3
|
Voltmeter
range: 20 V DC
|
Diagnostic plug (ALDL):
voltage supply
|
16 / ground
|
Ignition OFF
|
greater than 11.5 V
|
· Battery
voltage too low
· Lead
interruption between X D / Ter. 16 and voltage supply
· Fuse
F 12 defective
|
|
|
4.1
|
Ohmmeter
|
Diagnostic plug (ALDL):
data lead
|
X D / Ter. 7 to
K 61 / Ter. 55
|
Ignition OFF
|
approx. 0 W
|
· Lead
interruption between X D / Ter. 7 and K 61 /
Ter. 55
|
|
|
4.2
|
Ohmmeter
|
Diagnostic plug (ALDL):
data lead
|
X D / Ter. 7 and
ground
|
Ignition OFF
|
infinite W
|
· Short
circuit to ground
· Control
unit K 61 defective
|
|
|
5.1
|
|
Telltale H 30
|
|
Ignition OFF
|
Telltale ON
|
· Telltale
H 30 defective
· Fuse
F 15 defective
· Lead
interruption between H 30 and K 61 / Ter. 22
|
|
|
5.2
|
|
Telltale H 30
|
|
Engine running
Ensure that no trouble codes are
stored
|
Telltale OFF
|
· Control
unit K 61 defective
|
|
|
5.3
|
|
Telltale H 30
|
|
Ignition OFF
Disconnect control unit
Ignition ON
|
Telltale OFF
|
· Short
circuit between H 30 and ground
|
|
|
6
|
|
TECH 1 self - test DCL
adapter
|
|
See TECH 1 Operating
Instructions
|
|
|
|
|
|
Note: After test steps 7 and 8, any stored trouble codes are
deleted.
|
|
7
|
Ohmmeter
|
Control unit plug K 61:
ground
|
Ter. 14 / ground
Ter. 19 / ground
Ter. 24 / ground
|
Ignition OFF
Disconnect plug from control
unit K 61
|
approx. 0 W
|
· Transfer
resistance atgrounding point too high
· Lead
interruption between K 61 and grounding point
· Control
unit K 61 defective
|
|
|
8
|
Voltmeter range:
20 V DC
|
Control unit plug K 61:
voltage supply Ter. 30 and
Ter. 15
|
Ter. 18 / ground
Ter. 27 / ground
|
Ignition OFF
Disconnnect plug K 61
|
greater than 11.5 V
|
· Battery
voltage too low
· Lead
interruption between Ter. 30 or Ter. 15 and control unit K 61
· Vehicles
with ATWS and / or immobilizer:
ATWS and / or immobilizer
in operation or defective
· Fuel
pump relay K 44 defective
· Control
unit K 61 defective
|
|
|
9
|
Voltmeter range:
20 V DC
|
Injectors relay voltage supply,
control unit Ter. 37
|
Ter. 37 / ground
|
Ignition ON
|
greater than 11.5 V
|
· Battery
voltage too low
· Lead
interruption between injectors relay K 43 and control unit K 61
· Lead
interruption between Ter. 30 and injectors relay K 43
· Injectors
relay K 43 defective
· Control
unit K 61 defective
|
|
|
10
|
|
Auxiliary fan, electronics box
|
|
Ignition ON
|
Auxiliary fan in electronics box
running
|
· Fuse
F 50, F 15 defective
· Auxiliary
fan M 28 defective
· Fan
relay K 26 defective
· Coolant
temperature switch
|
|
