Test TC-7A - No Vehicle Speed Sensor Signal (DTC 15)

WARNING: This page is about a different car, the 1995 Dodge Pickup and 1995 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagrams, see WIRING DIAGRAMS section at the end of this article.

WARNING: Keep hands and feet clear of rotating wheels.

Raise vehicle so drive wheels are free to spin. Start engine. Using scan tool, read Vehicle Speed Sensor (VSS) signal. Put transmission in any forward gear. If scan tool displays more than zero MPH, go to next step. If scan tool does not display more than zero MPH, go to step 4).
Condition required to set trouble code is not present at this time. NO VEHICLE SPEED SENSOR SIGNAL trouble code sets if Powertrain Control Module (PCM) does not see a VSS signal at PCM terminal No. 47 (White/Orange wire) for more than 11 seconds. Possible causes are: open or shorted VSS signal circuit (White/Orange wire), open VSS sensor 8-volt supply circuit (Orange wire), open VSS sensor ground circuit (Black/Light Blue wire), failed VSS sensor, speedometer pinion damaged or failed PCM. Go to next step.
Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, see INACTIVE DTC CONDITION . Perform TEST VER-2.
Turn ignition off. Disconnect Vehicle Speed Sensor (VSS) connector. Inspect VSS connector for damaged or pushed-out terminals. Repair as necessary. Perform TEST VER-2. If connector is okay, go to next step.
Turn ignition on. Using scan tool in voltmeter mode, check voltage on VSS connector, 8-volt supply circuit (Orange wire). If voltage is less than 7 volts, repair open Orange wire. Perform TEST VER-2.
If voltage is more than 7 volts, check voltage on VSS connector, signal circuit (White/Orange wire). If voltage is less than 4 volts, go to TEST TC-7B. If voltage is more than 4 volts, connect a jumper wire between VSS signal circuit (White/Orange wire) and ground circuit (Black/Light Blue wire) on VSS sensor connector.
Using scan tool, read vehicle speed signal. Make and break connection at VSS sensor connector several times while observing scan tool display. If scan tool does not display more than zero MPH, go to TEST TC-7B.
If scan tool displays more than zero MPH, remove VSS. Inspect speedometer pinion gear. Repair as necessary. Perform TEST VER-2. If pinion gear is okay, replace VSS. Perform TEST VER-2.