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Test "H" (SUNLOAD Sensor)

WARNING: This page is about a different car, the 1996 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

  1. Check EATC System

    Test EATC system operation. See EATC SYSTEM TEST under TESTING. Repair as necessary. If system tests okay, go to next step.

  2. Check For Codes

    Turn ignition on. Enter self-diagnostics. See SELF-DIAGNOSTIC TEST. Record any codes displayed, and exit self-diagnostics. If Code 050 is set, go to step 3). If Code 052 is set, go to step 6). If neither code is set, go to step 4).

  3. Check Sunload Sensor Resistance

    Disconnect negative battery cable. Disconnect sunload sensor connector. Using ohmmeter, measure resistance across sensor terminals. There should be some resistance, depending on amount of light available. If there is any resistance, go to next step. If there is no resistance, replace sensor.

  4. Check Voltage Input To Brown Wire Terminal Of Sensor Connector

    Turn ignition on. Select AUTOMATIC mode. Disconnect sunload sensor connector. Measure voltage at Brown wire terminal of sensor connector. If voltage is approximately 5 volts, go to step 7). If voltage is not approximately 5 volts, go to next step.

  5. Check Voltage Output At Brown Wire Terminal Of EATC Module

    Measure voltage at terminal No. 16 (Brown wire) of EATC module. If voltage is approximately 5 volts, go to next step. If voltage is not approximately 5 volts, replace EATC module (control panel).

  6. Check For Open Brown Wire

    Turn ignition off. Connect jumper wire between known-good ground and Brown wire terminal of sensor connector. Using ohmmeter, measure resistance between known-good ground and terminal No. 16 (Brown wire) of EATC module. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open Brown wire.

  7. Check For Open Pink/Black Wire

    Connect jumper wire between known-good ground and Pink/Black wire terminal of sensor connector. Using ohmmeter, measure resistance between known-good ground and terminal No. 2 (Pink/Black wire) of EATC module. If resistance is 5 ohms or less, replace sensor. If resistance is more than 5 ohms, repair open Pink/Black wire.
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