Tracer L4-110 1.8L DOHC (1995)
Data Link Connector: Description and Operation
PURPOSE
The Data Link Connector (DLC) provides access to several systems in the vehicle for diagnosis and testing procedures. The Self Test Output
(STO) and the Self Test Input (STI) connectors are used when performing the Electronic Engine Control (EEC) Quick Test diagnostic procedure
with either a scan tool, analog voltmeter, or jumper wire.
OPERATION
When the STI connector is jumped to ground, a signal is sent to the Powertrain Control Module (PCM) activating PCM Self Test mode. The STO
connector receives output signals from the PCM that appear as numbered codes on the scan tool, needle sweeps on the analog voltmeter, or flashes
from the Malfunction Indicator lamp (MIL). Codes retrieved from PCM memory represents a malfunction within the EEC system.
The following tests for systems can be accessed through the DLC pins:
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Electronic engine control diagnosis - TEN and FEN pins
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Electronic transaxle control diagnosis - TAT and FAT pins
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Initial set - TEN pin
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Fuel pump check - F/P pin
^
Engine speed check - IG-pin
^
Anti-lock brake system diagnosis - TBS and FBS pins
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Horn/Air Bag system check - FAB pin
^
Battery voltage check - +B pin
^
Switch monitor diagnosis- MEN pin
