Circuit/System Verification
1. Raise and support the drive wheels.
2. Start and idle the engine.
3. Place the transmission in DRIVE.
4. Monitor VSS on the scan tool under engine data.
5. The VSS on the scan tool should be greater than 100 RPM.
Circuit/System Testing
1. Measure the resistance between the VSS high signal circuit and the VSS low signal circuit. The resistance should be between 1,420-2,140
ohms.
锟斤拷If the value is greater than 2,140 ohms, test the VSS high signal circuit and the VSS low signal circuit for an open.
锟斤拷If the value is less than 1,420 ohms, test the VSS high signal and the VSS low signal circuits for a shorted together condition.
2. Measure the resistance of the VSS high signal circuit to ground. The resistance should be greater than 10M ohms.
锟斤拷If the value is less than 10M ohms, repair the short to ground.
3. Measure the resistance between the VSS low signal circuit and ground. The resistance should be greater than 10M ohms.
锟斤拷If the value is less than 10M ohms, repair the short to ground.
4. Reconnect the ECM connector. Disconnect the VSS connector. Ignition ON, test the VSS high signal circuit for a short to voltage.
锟斤拷If all circuits/connections test normal, test or replace the VSS.
5. If all previous steps for circuit checking and VSS replacement have been made and all component testing has been performed and the
condition persists replace the ECM.
Component Testing
1. Verify the VSS resistance is within the specified range.
2. Using a terminal test kit, connect the DMM between the VSS high signal and the VSS low signal circuits at the VSS connector. Raise and
support the drive wheels. While rotating the drive wheels by hand ensure the AC voltage reading on the DMM is above 0.4 volt.
锟斤拷If the AC voltage is not above 0.4 volt, replace the VSS.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Ensure that the VSS is 500 RPM or greater for 3 seconds and does not change more than 500 RPM or greater for 3 seconds.
* Vehicle Speed Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Sensors and Switches - Computers and
Control Systems/Vehicle Speed Sensor/Service and Repair/MP 3010-NP0 - Transfer Case)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
MP 3023/3024-NQH - Transfer Case
DTC P2160 or P2161
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P2160
- Vehicle Speed Sensor (VSS) 2 Circuit Low Voltage
DTC P2161
- Vehicle Speed Sensor (VSS) 2 Circuit Intermittent
