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Test
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Tester
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Checking
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Notes
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Nominal
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Possible Cause of
Trouble,
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Step
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Multimeter
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Value
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Trouble-shooting
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MKM-587-A
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of
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between
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1
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Ohmmeter
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Diagnostic
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A
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Ground
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Ignition
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approx. 0 W
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· Transfrer
resistance at
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plug
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OFF
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grounding point too high
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(ALDL): ground
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2
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Voltmeter
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Diagnostic
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B
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Ground
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Ignition
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> 9.0 V
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· Battery voltage
too low
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Range: 20 V
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plug (ALDL):
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ON
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· Lead interruption
between
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DC
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excitation lead
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X 13/Ter.B and X 5/Ter. 5
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· Lead interruption
between
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X 5/Ter. 5 and K 84/Ter. 20
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· Control unit K 84
defective
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3
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Voltmeter
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Diagnostic
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F
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Ground
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Ignition
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> 11.5 V
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· Battery voltage
too low
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Range: 20 V
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plug
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ON
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· Lead interruption
between
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DC
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(ALDL): voltage
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X 13/Ter. F and voltage supply
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supply Ter. 30
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4
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Voltmeter
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Diagnostic
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G
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Ground
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Ignition
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0 to 0.2 V
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· Battery voltage
too low
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Range: 20 V
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plug
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ON
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· Lead interruption
between
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DC
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(ALDL):
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X 13/Ter. G and X 5/Ter. 4
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data lead
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· Lead interruption
between
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X15/Ter. 4 and K 84/Ter. 19
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· Control unit K 84
defective
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5
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-
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Telltale H 30
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-
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-
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Ignition
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Telltale H
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0·Telltale H 30
defective
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ON
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ON
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· Lead interruption
between
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H 30 and X 21/Ter. 12
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· Lead interruption
between
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X 21/Ter. 12 and X 5/Ter. 11
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· Lead interruption
between
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X 5/Ter. 11 and K 84/Ter. 16
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· Control unit K 84
defective
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6
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-
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TECH 1
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-
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-
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See
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-
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-
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self-test
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TECH 1
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Operating
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Instructions
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Note: After Test Steps 7
and 8 any Trouble Codes which may be stored are deleted.
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7
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Ohmmeter
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Plug on
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5
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Ground
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Ign. OFF
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approx. 0 W
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· Transfer
resistance at
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control unit
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Disconnect
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grounding point too high
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K 84: ground
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plug on
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· Lead interruption
between
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control unit
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K 84/Ter. 5 and grounding point
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K 84
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· Control unit K 91
defective
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8
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Voltmeter
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Plug on control
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Ign. OFF
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> 11.5 V
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· Battery voltage
too low
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Range: 20 V
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unit K 84:
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Remove plug
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· Lead interruption
between
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DC
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voltage
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on control
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K 84/Ter. 12 and Ter. 30
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supply
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unit K 84
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· Lead interruption
between
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Ter. 30:
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12
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Ground
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Ign. ON
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K 84/Ter. 09 and Ter. 15
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Ter. 15:
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9
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Control unit K 84 defective
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