1. Key OFF.
2. Disconnect the X1 connector from the VSS. Using the J 35616-3 GY probes, test for 1200-2140 ohm between the VSS high signal circuit,
VSS pin A, and the VSS low signal circuit, VSS pin B.
锟斤拷If the resistance is outside the specified value, replace the VSS.
3. Test for greater than 10 M ohm between the following circuits and a good ground.
* VSS high signal circuit, VSS pin A.
* VSS low signal circuit, VSS pin B.
锟斤拷If the resistance is below the specified value, Replace the VSS.
4. Block the front wheels. Raise and support the driver's side rear wheel. While rotating the raised wheel by hand, test for greater than 0.4 V AC
between the VSS high signal circuit, VSS pin A, and the VSS low signal circuit, VSS harness pin B. The passenger side rear wheel takes
more effort to turn. If both drive wheels are raised and unblocked, twice the effort will be required to reach 0.4 V AC. If the vehicle is
sufficiently supported to safely place the transmission in neutral, less effort will be required to turn the raised wheel.
锟斤拷If the AC voltage is below the specified value, replace the VSS.
ECM
1. Remove key from the ignition. Let sit for 2 minutes to ensure ECM shut down
2. Disconnect the X1 connector from the ECM. Using the J 35616-64B L-BU probes, test for 1200-2140 ohm between the VSS high signal
circuit, ECM X1, pin 71 and the VSS low signal circuit, ECM X1, pin 72.
锟斤拷If the resistance is below the specified value, test the affected circuits for being shorted together. If all circuits and connections test
normal, test the VSS for proper operation.
锟斤拷If the resistance is above the specified value, test the affected circuits for open/high resistance condition. If all circuits and connections
test normal, test the VSS for proper operation.
3. Using the J 35616-64B L-BU probes, test for greater than 1 M ohm between the following circuits and a good ground.
* VSS high signal circuit, ECM harness X1 pin 71.
* VSS low signal circuit, ECM harness X1 pin 72.
锟斤拷If the resistance is below the specified value, test the affected circuit for being shorted to ground. If all circuits and connections test
normal, test the VSS for proper operation.
4. Reprogram the ECM. If the DTC continues to set, replace the ECM.
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
P2176
DTC P1516, P2101, P2119, or P2176
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 P1516
- Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance
DTC P2101
- Throttle Actuator Position Performance
