Honda CRX silhouetteCRX

Coolant Temperature Gauge

16-80prose procedure

Gauge Test

  1. 1
    Make sure the ignition switch is OFF, then disconnect the YEL/GRN wire from the coolant temperature gauge sender and ground it with a jumper wire.
    Engine-bay view showing the coolant temperature gauge sender and its YEL/GRN wire connection, for the Gauge Test.
  2. 2
    Turn the ignition switch ON. Check that the pointer of the coolant temperature gauge starts moving toward "H" mark.
    CAUTION: Turn the ignition switch OFF before the pointer reaches "H" mark on the gauge dial. Failure to turn the ignition OFF quickly enough may cause damage to the gauge.

Sender Test

  1. 1
    Disconnect the YEL/GRN wire from the sender.
    Engine-bay view showing the coolant temp. gauge sender positive terminal and the YEL/GRN wire, for the Sender Test resistance measurement.
  2. 2
    With the engine cold, use an ohmmeter to measure resistance between the positive terminal and the engine (ground).
  3. 3
    Check the temperature of the coolant.
  4. 4
    Run the engine and measure the change in resistance with the engine at operating temperature (cooling fan comes on).
  5. 5
    If obtained readings are substantially different from specifications above, replace the gauge sender.
Resistance (Ω)
56°C (133°F) ["C" mark]142
85°C (185°F)—100°C (212°F)49—32
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