Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLVO1991240 L4-2.3L SOHC VIN 88 B230FREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDATA LINK CONNECTORTESTING AND INSPECTION
1991 Volvo 240 L4-2.3L SOHC VIN 88 B230F
Data Link Connector: Testing and Inspection
1991 Volvo 240 L4-2.3L SOHC VIN 88 B230FSECTION Testing and Inspection
NB. CHECKING DATA LINK CONNECTOR (DLC)
NB1
Checking LED
-Ignition on.
-Press the DLC button.
The LED should light when the button is down.
If the LED does not light
-Check battery power NB2.
If the LED lights
-Check the power supply from the control module NB4.
NB2
Checking The Battery Power
-Ignition on.
Connect a voltmeter between terminal 4 in the connector and GND.
The voltmeter should read battery voltage.
If this value is OK
-Check the GND point NB3.
If the reading is incorrect
-Check the fuse and the wiring to it for breaks.
NB3
Checking The GND Point
-Ignition off.
Connect an ohmmeter between terminal 8 in the connector and GND.
The ohmmeter should read approx. 0 OHMS.
If this value is OK
-Try using a new DLC.
If the reading is incorrect
-Check the GND point and the wiring to it for breaks.
NB4
Checking The Power Supply From The Control Module
-Ignition on.
Connect a voltmeter between terminal 2 in the connector and GND.
Connect a voltmeter between terminal 6 in the connector and GND.
The voltmeter should read more than 5 volts in both cases.
If the readings are OK
-Replace the DLC
If the reading Is Incorrect
-Check the wiring between the control module and the DLC for breaks or grounding.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.