Golf III L4-2.0L (ABA) (1995)
OBD 1 Adaptor
Jumper Wire To 16-Pin DLC Hookup, Jetta Shown
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With engine RUNNING, connect OBD1 adaptor to 16 Pin DLC or if jumper wire is being used join together jumper connectors J1 and J2.
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MIL in dash MUST light up.
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IF MIL does NOT light up:
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Check wires from DLC to the Motronic ECM for open.
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Check adaptor/jumper connections.
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CONTINUE TEST ONLY WHEN:
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Coolant temperature is over 80° C (176° F) or coolant fan has cycled at least once.
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Engine has run 2 minutes or more at Closed Throttle Position.
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Check closed throttle idle speed. Should be:
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840 ± 40 rpm (A/C OFF)
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870 ± 40 rpm (A/C ON)
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Check CO content. Should be:
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0.3 - 1.2 vol. %
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Check ignition timing. Should be:
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Approx. 12° BTDC
NOTE: Coolant Fan MUST NOT BE RUNNING when the following test steps are started. If fan is running wait for fan cycle to end.
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Remove OBD1 adaptor from 16 Pin DLC or separate jumper wire connectors J1 and J2 (reverse of step 3).
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MIL will go OFF.