DTC P0717 Input Speed Sensor Circuit Low Input. GMC Truck Savana 2000

Go to Step 5

Test the ground circuit (CKT 1231) of the ISS sensor for an open between the VCM connector C3-7 and cavity 2 of the ISS sensor connector.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 6

Turn ON the ignition, with the engine OFF.
Using the J 39200 DMM on DC volts, and the J 35616 , measure the voltage from cavity 1 of the ISS sensor connector to a good ground.

Does the voltage measure within the specified value?

4.0-5.1 volts DC

Go to Step 7

Go to Step 8

Turn ON the ignition, with the engine OFF.
Measure the voltage at cavity 2 of the ISS sensor connector.

Does the voltage measure less than the specified value?

0.2 volts

Go to Step 10

Is the voltage reading in Step 6 greater than the specified value?

5.1 volts

Test the signal circuit (CKT 1230) and the ground circuit (CKT 1231) of the ISS sensor for a short to B+ voltage or shorted together between the VCM connector C3 and the ISS harness connector cavities 1 and 2.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Re-install the ISS sensor in the transmission.
Reconnect the ISS sensor connector to the sensor.
Disconnect the VCM connector C3 (additional DTCs may set).
Using the J 39200 DMM on AC voltage, probe across terminal C3-7 and terminal C3-8 at VCM connector C3.
Remove the fuel pump relay.
With the vehicle in PARK, crank the engine.

Does the voltage measure above the specified value?

0.5 volts

Replace the ISS sensor.

Refer to Vehicle Speed Sensor Replacement .

Did you complete the replacement?

Replace the VCM.

Refer to VCM Replacement/Programming (4.3L) or VCM Replacement/Programming (5.0/5.7L) or VCM Replacement/Programming (7.4L) in Engine Controls.

Did you complete the replacement?

Perform the following procedure in order to verify the repair:

Select DTC.
Select Clear Info.
Operate the vehicle under the following conditions:

•	The vehicle in drive range and the engine must be running.

•	The vehicle speed greater than 12 MPH.

•	The VCM must see an input speed greater than 500 RPM for 1 second.

Select Specific DTC.
Enter DTC P0717.

Has the test run and passed?

System OK

Go to Step 1

DTC P0717 Input Speed Sensor Circuit Low Input Diesel

Automatic Transmission Components Diesel
Automatic Transmission Controls Schematics Diesel
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The automatic transmission input (shaft) speed (ISS) sensor provides transmission input speed to the powertrain control module (PCM). The ISS sensor is a permanent magnet (PM) generator. The sensor mounts into the transmission case and maintains a slight air gap between the sensor and the forward clutch housing. The PM generator produces an AC voltage as the forward clutch housing rotor teeth pass through the sensor's magnetic field. The AC voltage level increases as the turbine shaft speed increases. The PCM converts the AC voltage into a digital signal. The PCM determines actual turbine speed using the digital signal. The PCM uses the input speed to calculate torque converter slip speed, and gear ratios.

When the PCM detects a low or no input speed during high vehicle and high engine speeds, then DTC P0717 sets. DTC P0717 is a type B DTC.

Conditions for Running the DTC

•	No OSS sensor DTCs P0722 or P0723.

•	No TFP manual valve position switch DTC P1810.

•	TFP manual valve position switch is not in PARK or NEUTRAL.

•	The vehicle speed is greater than 32 km/h (20 mph).

•	System voltage is 8.0-18.0 volts.

•	The engine runs greater than 475 RPM 7 seconds.

Conditions for Setting the DTC

The ISS is less than 50 RPM for at least 5 seconds.

Action Taken When the DTC Sets

•	The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.

•	The PCM defaults the transmission to maximum line pressure.

•	The PCM freezes shift adapts.

•	The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records.

•	The PCM stores the DTC P0717 in PCM history during the second consecutive trip in which the Conditions for Setting the DTC are met.

Conditions for Clearing the MIL/DTC

•	For Federal and California emissions, the PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.

•	A scan tool can clear the MIL/DTC.

•	For Federal and California emissions, the PCM clears the DTC from PCM history if the vehicle completes 40 consecutive warm-up cycles without an emission related diagnostic fault occurring.

•	For vehicles equal to or greater than 15,000 lbs GVW, the PCM clears the DTC from PCM history if the vehicle completes 40 consecutive warm-up cycles without a non-emission related diagnostic fault occurring.

•	The PCM cancels the DTC default actions when the fault no longer exists and the ignition switch is OFF long enough in order to power down the PCM.

Diagnostic Aids

•	First diagnose and clear any engine DTCs that are present. Then inspect for any transmission DTCs that may have reset. If a DTC P0717 and a DTC P0730 are both present, diagnose DTC P0717 first.

•	Inspect the connectors at the PCM, the ISS sensor and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

•	Inspect the circuit wiring for an intermittent condition. Refer to Testing for Electrical Intermittents in Wiring Systems.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

This step tests for proper operation of the ISS sensor.

This step tests for proper ISS sensor and circuit operation. Remove the fuel solenoid fuse in order to eliminate a flooding condition.

DTC P0717

Step

Action

Value(s)

Yes

Did you perform the Powertrain Diagnostic System Check?

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

Install a Scan Tool .
Turn ON the ignition, with the engine OFF.

Important: Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records for reference. The Clear Info function will erase the data.

Record the DTC Freeze Frame and Failure Records.
Clear the DTC.
Raise and support the drive axle assembly.
Select Scan Tool Transmission ISS.
Start the engine and place the transmission selector in D3 range.
With the drive wheels rotating, slowly accelerate to 2000 engine RPM and hold.

Is the Scan Tool Transmission ISS more than 800 RPM?

Go to Diagnostic Aids

Go to Step 3

Turn OFF the ignition.
Remove the connector from the ISS sensor.
Remove the ISS sensor from the transmission.
Using the J 39200 digital multimeter (DMM) and J 35616 connector test adapter kit, measure the resistance of the ISS sensor.

Does the sensor resistance measure within the specified value?

1042-2088ohms

Go to Step 4

Go to Step 11

Test the signal circuit (CKT 1230) of the ISS sensor for an open or short to ground between the PCM connector C1-D11 and cavity 1 of the ISS sensor connector.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 5

Test the ground circuit (CKT 1231) of the ISS sensor for an open between the PCM connector C1-D1 and cavity 2 of the ISS sensor connector.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 6

Turn ON the ignition, with the engine OFF.
Using the J 39200 DMM on DC volts, and the J 35616 , measure the voltage from cavity 1 of the ISS sensor connector to a good ground.

Does the voltage measure within the specified value?

4.0-5.1 volts DC

Go to Step 7

Go to Step 8

Turn ON the ignition, with the engine OFF.
Measure the voltage at cavity 2 of the ISS sensor connector.

Does the voltage measure less than the specified value?

0.2 volts

Go to Step 10

Is the voltage reading in Step 6 greater than the specified value?

5.1 volts

Test the signal circuit (CKT 1230) and the ground circuit (CKT 1231) of the ISS sensor for a short to B+ voltage or shorted together between the PCM connector C1 and the ISS harness connector cavities 1 and 2.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Re-install the ISS sensor in the transmission.
Reconnect the ISS sensor connector to the sensor.
Disconnect the PCM connector C1. (Additional DTCs may set.)
Using the J 39200 DMM on AC voltage, probe across terminal C1-D1 and terminal C1-D11 at PCM connector C1.
Remove the fuel pump relay.
With the vehicle in PARK, crank the engine.

Does the voltage measure above the specified value?

0.5 volts

Replace the ISS sensor.

Refer to Vehicle Speed Sensor Replacement .

Did you complete the replacement?

Replace the PCM.

Refer to Powertrain Control Module Replacement/Programming in Engine Controls.

Did you complete the replacement?