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  • DTC 24 - Throttle Position Sensor Voltage Low

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    DTC 24 - Throttle Position Sensor Voltage Low - TEST FC-6A

    1. Using DRB-II, read Throttle Position Sensor (TPS) voltage. If TPS voltage is less than .2 volt, go to step 5). If TPS voltage is .2 volt or more, monitor TPS voltage on DRB-II while opening and closing throttle. If voltage change is not smooth, replace TPS. Perform TEST VER-1.
    2. If voltage change is smooth, wiggle TPS connectors and harness while monitoring DRB-II. If voltage changed when harness and connectors were wiggled, repair harness or connector where wiggling caused voltage change. Perform TEST VER-1. If voltage did not change when harness and connectors were wiggled, condition required to set fault is not present at this time.
    3. THROTTLE POSITION SENSOR VOLTAGE LOW fault sets if TPS voltage at PCM terminal No. 22 becomes less than .2 volt or if vehicle speed is greater than 20 MPH, engine speed is greater than 1500 RPM, engine vacuum is less than 2 in. Hg and TPS voltage is less than .5 volt. Possible causes are sensor signal wire shorted to ground, loss of 5-volt supply and TPS sensor failure.
    4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary. Perform TEST VER-1. If no problems were found with wiring and connectors, see INACTIVE FAULT CONDITION. Test is complete. Perform TEST VER-1.
    5. Disconnect throttle position sensor. Using DRB-II, read TPS voltage. If TPS voltage is greater than one volt, replace throttle position sensor. Perform TEST VER-1. If TPS voltage is one volt or less, check for voltage at TPS connector, 5-volt supply circuit (Violet/White wire) using DRB-II in voltmeter mode. If voltage is 4 volts or less, repair open in Violet/White wire. Perform TEST VER-1.
    6. If voltage is greater than 4 volts, turn ignition off. Disconnect Powertrain Control Module (PCM). Using an external ohmmeter, check resistance between throttle position sensor connector, signal circuit Orange/Dark Blue wire) and ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair Orange/Dark Blue wire for a short to Black/Light Blue wire. Perform TEST VER-1.
    7. If resistance is 5 ohms or more, check resistance of throttle position sensor, signal circuit (Orange/Dark Blue wire) using DRB-II. If resistance is 5 ohms or more, replace PCM. Perform TEST VER-1. If resistance is less than 5 ohms, repair Orange/Dark Blue wire for a short to ground. Perform TEST VER-1.

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