Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC P0716: Input Speed Sensor PerformanceDTC P0717: Input Speed Sensor Circuit Low Voltage
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Input Speed Sensor Supply Voltage | P0716, P0717 | P0716, P0717 | P0716, P0717 | P0716 |
Input Speed Sensor Signal | P0716, P0717 | P0716, P0717 | P0716, P0717 | P0716 |
Typical Scan Tool Data
Circuit | Normal Range | Short to Ground | Open/High Resistance | Short to Voltage |
|---|---|---|---|---|
Operating Conditions: Engine running, normal operating temperature | ||||
ISS Signal | 450-7,000 RPM | 0 RPM | 0 RPM | 0 RPM |
ISS/OSS Supply Voltage | -- | 0 RPM | 0 RPM | 0 RPM |
Circuit | Normal Range | Short to Ground | Open/High Resistance | Short to Voltage |
|---|---|---|---|---|
Operating Conditions: Key ON, Engine OFF or Engine running, normal operating temperature | ||||
ISS Signal | OK | OK | OK | OK |
ISS/OSS Supply Voltage | OK | Out of range | Out of range | Out of range |
8.3-9.3 Volts = OK Any other voltage = Out of range | ||||
Circuit/System Description
The input speed sensor (ISS) is a hall-effect type sensor. The ISS mounts to the control valve upper body assembly and connects to the control solenoid (w/body and TCM) valve assembly through a wire harness and connector. The sensor faces the 1-2-3-4 and 3-5-R clutch housing machined teeth surface. The sensor receives 8.3-9.3 volts on the input/output speed sensor (ISS/OSS) Supply Voltage circuit from the transmission control module (TCM). As the 1-2-3-4 and 3-5-R clutch housing rotates, the sensor produces a signal frequency based on the machined surface of the 1-2-3-4 and 3-5-R clutch housing. This signal is transmitted through the ISS signal circuit to the control solenoid (w/body and TCM) valve assembly. the control solenoid (w/body and TCM) valve assembly uses the ISS signal to determine line pressure, transmission shift patterns, torque converter clutch (TCC) slip speed and gear ratio.
Conditions for Running the DTC
P0716
| • | No ISS DTC P0717. |
| • | No OSS DTCs P0722 or P0723. |
| • | The engine run time is greater than 5 seconds. |
| • | The vehicle speed is greater than 16 km/h (10 mph). |
| • | The calculated throttle position is greater than 8 percent. |
P0717
| • | No OSS DTCs P0722 or P0723. |
| • | The vehicle speed is greater than 16 km/h (10 mph). |
| • | The engine torque is greater than 50 N·m (37 lb. ft). |
Conditions for Setting the DTC
P0716
| • | The TCM detects an unrealistic drop in input shaft speed. |
| • | ISS DTC P0716 is not failed this ignition. |
| • | Transmission input speed is 1,050 RPM or greater for 2 seconds. |
| • | Transmission input speed drops 1,000 RPM for greater than 4 seconds and does not recover. |
P0717
| • | The TCM detects no output shaft speed when there is vehicle speed. |
| • | DTC P0717 is not failed this ignition. |
| • | Transmission input shaft speed is less than 100 RPM for 5 seconds. |
Action Taken When the DTC Sets
| • | P0716 and P0717 are Type A DTCs. |
| • | The TCM freezes transmission adaptive functions. |
| • | The TCM turns OFF all solenoids. |
Conditions for Clearing the DTC
P0716 and P0717 are Type A DTCs.
Diagnostic Aids
Inspect the ISS, harness, connector, and control solenoid (w/body and TCM) valve assembly pins for metallic debris and the 1-2-3-4 and 3-5-R clutch housing machined teeth surface for damage or misalignment. Proper torque of the OSS mounting bolt is critical to proper OSS operation. Use a GM-approved terminal test kit for any test that requires probing the control solenoid (w/body and TCM) valve assembly harness connector or a component harness connector.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
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 out.
Circuit/System Testing
- With the ignition ON, observe the transmission ISS/OSS supply voltage circuit status on the scan tool, the parameter should display OK.
- Perform the Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test. The scan tool should display Transmission ISS between 100-400 RPM.
| ⇒ | If the circuit status does not display OK, disconnect the ISS/OSS connector from the control solenoid (w/body and TCM) valve assembly and recheck the scan tool display. |
| ⇒ | If the transmission ISS/OSS supply voltage circuit status still displays OK, visually inspect the ISS, harness, connector, the control solenoid (w/body and TCM) valve assembly pins for metallic debris and 1-2-3-4 and 3-5-R clutch housing machined teeth surface for damage or misalignment. Repair or replace any damaged components. |
| ⇒ | If 100-400 RPM ISS RPM is displayed, replace the ISS/OSS assembly. |
| ⇒ | If no ISS RPM is displayed or the RPM is out of range, replace the control solenoid (w/body and TCM) valve assembly. |
Component Testing
Perform the Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test.
Repair Instructions
Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Perform the Input and Output Speed Sensor Replacement. |
| • | Control solenoid (w/body and TCM) valve assembly, refer to Control Module References for replacement, setup, and programming. |
| • | Perform the Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test. |
| • | Perform the Service Fast Learn Adapts. |
