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1-2-3 code for coolant temp sensor 200 1990

posted by  trey on  Sat Sep 11 11:41 CST 2004
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last visit: Sat Apr 14 01:19 CST 2001
[RELATED]

When check engine light comes on car starts idling rough and this is only code given.

Replaced sensor and code still came back. The sensor for ECU not temp gauge. Maybe problem in wire harness?








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    1-2-3 code for coolant temp sensor 200 1990

    posted by  someone claiming to be daryl_leek on  Sat Sep 11 13:21 CST 2004 [RELATED]

    From the Volvo manual:

    "If the signal from the ECT sensor corresponds to a temperature below -40C (-40F) or over 120C (240F) a DTC is logged."

    "Causes of fault:
    Break in or grouding of wiring, connections or a component.
    Contact resistance in connections.
    Poor signal GND connection."

    EE2 - Checking the reference voltage
    - Ignition on
    - Disconnect the sensor
    Connect a voltmeter between terminal 1 on the connnector and GND. The voltmeter should read 5V.

    EE3 - Checking the ECT sensor resistance
    - Ignition off
    - Sensor disconnected
    Connect an ohmmeter between terminal 1 on the sensor and GND. The (resistance) should read

    (from graph) 20C ~2600ohms, 100C ~200 ohms, 0C ~6k ohms

    ---

    The wire ends up on the ECU at pin 13.






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