The automatic transmission input speed sensor (ISS) is a permanent magnet with a coil of wire wound around. The ISS mounts in the case cover facing the reluctor wheel of the input shaft. As the reluctor wheel is driven by the turbine shaft, an AC signal is induced in the input speed sensor. Higher vehicle speeds induce a higher frequency and voltage at the sensor. There is a fixed air gap between the sensor and the teeth on the sensor reluctor wheel. The ISS input is used by the transmission control module (TCM) in order to control line pressure, torque converter clutch (TCC) apply and release, and transmission shift patterns. This sensor is also used to calculate the appropriate gear ratios and TCC slippage. This diagnostic indicates stuck, erratic, or intermittent conditions in the system.

P0716

P0716

The input shaft speed changes by 1,000 RPM or more for 3.25 seconds.

P0717

The input shaft speed is less than 100 RPM for 4.5 seconds.

DTCs P0716 and P0717 are type B DTCs.

Ensure the wiring harness is not stretched too tightly or other components are pressing on the AT inline 20-way connector body. Also inspect for proper clearance to any other components and wiring.

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Electrical Information Reference

Scan Tool Reference

DTC Type Reference

Special Tools

J 44152 Jumper Harness (20 pins)

Start the engine in PARK and observe the transmission ISS on the scan tool while varying the engine speed. The transmission ISS should vary with the engine speed and not drop.

1. Start the engine and ensure the Transmission ISS parameter on the scan tool is greater than 100 RPM.

⇒	If the value is less than 100 RPM disconnect the AT inline 20-way connector and install the J 44152 Jumper Harness on the transmission side.

2. Measure the resistance between the ISS high signal circuit and the ISS low signal circuit of the J 44152 . The resistance should be between 458 and 1,245 ohms.

⇒	If the value is greater than 1,245 ohms, test the ISS high signal circuit and the ISS low signal circuit for an open.

⇒	If the value is less than 458 ohms, test the ISS high signal and the ISS low signal circuits for a shorted together condition.

3. Measure the resistance of the ISS high signal circuit to the transmission case. The resistance should be greater than 10K ohms.

⇒	If the value is less than 10 ohms, replace the transmission wiring harness assembly.

4. Measure the resistance between the ISS high signal circuit and all other circuits of the J 44152 except the ISS low signal circuit. The resistance should be greater than 10K ohms.

⇒	If the value is less than 10K ohms, replace the transmission wiring harness assembly.

5. Measure the resistance between the ISS low signal circuit and all other circuits of the J 44152 except the ISS high signal circuit. The resistance should be greater than 10K ohms.

⇒	If the value is less than 10K ohms replace the transmission wiring harness assembly.

6. Remove the J 44152 from the transmission side and install on the engine side of the harness. Measure the resistance between the ISS high signal circuit and ground. The resistance should be greater than 10K ohms.

⇒	If the resistance is less than 10K ohms, test the ISS high signal circuit for a short to ground.

7. Measure the resistance of the ISS high signal circuit between the TCM connector and the AT inline 20-way connector. The resistance should be less than 10 ohms.

⇒	If the resistance is greater than 10 ohms, test the ISS high signal for an open.

8. Measure the resistance of the ISS low signal circuit between the TCM connector and the AT inline 20-way connector. The resistance should be less than 10 ohms.

⇒	If the resistance is greater than 10 ohms, test the ISS low signal for an open.

9. Ignition ON, test the ISS high signal circuit for a short to voltage.

⇒	If all circuit/connections test normal, test or replace the ISS.

Verify the ISS resistance is between 458-1,245 ohms.

Perform the Diagnostic Repair Verification after completing the repair.