Table 1
TECH 1 refers to Table 1, if the equipment is correctly
connected, but no data (with ignition ON) can be received from TECH 1.
· Start TECH 1 self-test. Connect TECH 1 Opel
Test Adapter between TECH 1 and diagnostic plug in the vehicle (see Operating
Instructions)
If no data is received after the self-test:
- Diagnostic plug (ALDL)
- Engine telltale
- Control unit voltage supply
- Control unit ground connection
are to be checked according to Table 1.
Table 1, Diagnostic Plug ALDL and Voltage Supply, Check
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Test
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Tester
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Test
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Notes
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Nominal
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Possible Cause of
Fault,
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Step
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Multimeter
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Values
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Trouble-shooting
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No.
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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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· Transfer
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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> 11.5 V
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· Lead interruption
between
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range: 20 V
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plug (ALDL):
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ON
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X 13 Ter. B and K 91 Ter. 13
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DC
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Excitation lead
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· Control unit 91
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
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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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> 9 V
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· Lead interruption
between
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range: 20 V
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plug
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ON
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X 13 Ter. G and K 91 Ter. 55
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DC
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(ALDL):
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· Control unit K 91
defective
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Data lead
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5
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-
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Telltale
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-
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-
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Ignition
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Telltale ON
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· Telltale H 30
defective
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H-30
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ON
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· Fuse F 13
defective
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· Lead interruption
between
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Ter. 15 and H 30
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· Lead interruption
between
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H 30 and K 91 Ter. 22
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· Control unit K 91
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 TECH 1
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-
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Self-test
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Operator's
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Manual
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Note: After test steps
7 and 8, any trouble codes that may be stored are deleted.
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7
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Ohmmeter
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Plug,
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K 91 Ter. 2
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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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K 91 Ter. 1
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Separate
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grounding point too high
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K 91: Ground
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K 91 Ter. 2
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plug at
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· Lead interruption
between
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control
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K 91 and grounding point
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unit K 91
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· Control unit K 91
defective
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8
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Voltmeter
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Control unit
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K 91 Ter. 1
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Ground
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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: 20V
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plug K 91:
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K 91 Ter. 2
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Remove
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· Lead interruption
betw. Ter. 30 or
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DC
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voltage
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plug K 91
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Ter. 15 and control unit K 91
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supply, Ter. 30
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Ign. ON
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· Control unit K 91
defective
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and Ter. 15
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· Fuel pump relay K
68 defective
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