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  • DTC 15 - No Vehicle Speed Sensor Signal Test

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    Mopar1973Man

    DTC 15 - No Vehicle Speed Sensor Signal Test FC-2A

    1. Raise and support vehicle so that wheels are allowed to spin. Start engine. Using DRB-II, read Vehicle Speed Sensor (VSS) signal. Put transmission in any forward gear. If vehicle speed sensor signal is NOT greater than zero MPH, go to step 4).
    2. If vehicle speed sensor signal is greater than zero MPH, condition required to set fault code is not present at this time. NO VEHICLE SPEED SENSOR SIGNAL fault sets if Powertrain Control Module (PCM) does not see a VSS signal at PCM terminal No. 47, VSS signal circuit (White/Orange wire) under road load conditions. Possible causes are: open or shorted VSS signal circuit, open VSS 8-volt supply at sensor, open sensor ground, failed VSS, failed PCM or failed DRL module.
    3. 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. Perform TEST VER-1.
    4. Turn ignition off. Disconnect VSS. On 2WD A/T models, go to TEST FC-2B. On all other models, turn ignition on. Using DRB-II in voltmeter mode, probe VSS connector, VSS signal circuit (White/Orange wire). If reading is 4 volts or less, go to TEST FC-2C. If reading is greater than 4 volts, connect jumper wire to VSS connector White/Orange wire.
    5. While reading VSS signal on DRB-II, tap other end of jumper wire to VSS connector, sensor ground circuit (Black/Light Blue wire). If DRB-II display is greater than zero MPH, replace vehicle speed sensor. Perform TEST VER-1. If display is not greater than zero MPH, turn ignition off.
    6. Put DRB-II in ohmmeter mode. Probe VSS connector, sensor ground circuit (Black/Light Blue wire). If resistance is 5 ohms or more, repair Black/Light Blue wire for an open circuit to wiring harness splice. Perform TEST VER-1. If resistance is 5 ohms or less, go to TEST FC-2C.

    No Vehicle Speed Sensor Signal Test FC-2B

    1. Turn ignition on. Put DRB-II in voltmeter mode. Using DRB-II, check voltage on VSS connector terminal No. 3, 8-volt supply circuit (Tan/Yellow wire). If reading is 7 volts or less, repair open in Tan/Yellow wire. Perform TEST VER-1.
    2. If voltage is more than 7 volts, probe VSS connector terminal No. 1, signal circuit (White/Orange wire) using DRB-II. If reading is 4 volts or less, go to TEST FC-2C. If reading is more than 4 volts, connect a jumper wire to VSS connector terminal No. 1, signal circuit (White/Orange wire).
    3. Using DRB-II, read VSS signal while tapping other end of jumper wire to VSS connector terminal No. 2, ground circuit (Black/Light Blue wire). If DRB-II display is more than zero MPH, replace VSS. Perform TEST VER-1.
    4. If DRB-II display was not more than zero MPH, turn ignition off. Using DRB-II in ohmmeter mode, check resistance of VSS connector terminal No. 2, ground circuit (Black/Light Blue wire). If reading is 5 ohms or more, repair open in Black/Light Blue wire to harness splice. Perform VERIFICATION TEST VER-2. If resistance is less than 5 ohms, go to TEST FC-2C.

    No Vehicle Speed Sensor Signal Test FC-2C

    1. Turn ignition off. Disconnect PCM connector. Inspect PCM connector for damaged or pushed-out terminals. Repair as necessary. Perform TEST VER-1. If PCM connector terminals are okay, check resistance of VSS signal circuit (White/Orange wire) between PCM connector terminal No. 47 and VSS connector using an external ohmmeter.
    2. If reading is 5 ohms or more, repair open in White/Orange wire. Perform TEST VER-1. If reading is less than 5 ohms, put DRB-II in ohmmeter mode. Probe PCM terminal No. 47, VSS signal circuit (Orange/White wire) at PCM connector. If reading is 5 ohms or more, replace PCM. Perform TEST VER-1. If resistance is less than 5 ohms, repair short to ground in White/Orange wire. Perform TEST VER-1.


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