DTC P0717 Input Speed Sensor Circuit Low Input. GMC Truck GMC K Pickup

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2000 🢒 GMC K Pickup - 4WD 🢒 DTC 🢒 DTC P0717 Input Speed Sensor Circuit Low Input

DTC P0717 Input Speed Sensor Circuit Low Input Gas

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

Circuit Description

The automatic transmission input (shaft) speed (AT ISS) sensor provides transmission input speed to the vehicle control module (VCM). The AT 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 VCM converts the AC voltage into a digital signal. The VCM determines actual turbine speed using the digital signal. The VCM uses the input speed to calculate torque converter slip speed, and gear ratios.

When the VCM detects a low or no input speed during high vehicle and high engine speeds, then DTC P0717 sets. DTC P0717 is a type C DTC. For California emissions vehicles, DTC P0717 is a type B DTC.

Conditions for Running the DTC

•	No OSS DTC P0502 or P0503.

•	No TFP manual valve position switch DTC P1810.

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

•	The vehicle speed is greater than 12 mph.

•	The engine runs greater than 475 RPM for at least 7 seconds, and not in fuel cutoff.

Conditions for Setting the DTC

The measured input speed is less than 50 RPM for at least 5.0 seconds.

Action Taken When the DTC Sets

•	For California emissions only, the VCM illuminates the malfunction indicator lamp (MIL).

•	The VCM defaults the transmission to maximum line pressure.

•	The VCM freezes shift adapts.

•	The VCM stores DTC P0717 in VCM history.

Conditions for Clearing the MIL/DTC

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

•	A scan tool clears the DTC from VCM history.

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

•	For Federal emissions, the VCM clears the DTC from VCM history if the vehicle completes 40 consecutive warm-up cycles without a non-emission related diagnostic fault occurring.

•	The VCM 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 VCM.

Diagnostic Aids

•	Inspect the wiring at the VCM, the OSS connector and all other circuit connecting points for the following:

-	A backed out terminal

-	A damaged terminal

-	Reduced terminal tension

-	A chafed wire

-	A broken wire inside the insulation

-	Moisture intrusion

Corrosion

-	The AT ISS sensor harness being near the DIS components or the ignition wires

•	When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.

•	First diagnose and clear any engine DTCs or TP sensor codes that are present. Then inspect for any transmission DTCs that may have reset.

Test Description

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

This step tests for proper circuit operation up to the VCM connections. Remove the fuel pump relay in order to eliminate a flooding condition during this step.

This step tests for proper operation of the ISS sensor.

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 5.0/5.7L or Powertrain On Board Diagnostic (OBD) System Check 7.4L

Install a Scan Tool .
With the engine OFF, turn the ignition switch to the RUN position.

Important: Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the VCM.

Record the Freeze Frame and Failure Records.
Clear the DTC.
With the vehicle in PARK, start the engine and idle greater than 500 RPM.
Select scan tool AT ISS and engine RPM.

Is the AT ISS greater than 50 RPM?

Go to Diagnostic Aids

Go to Step 3

Turn the ignition switch to the OFF position.
Disconnect the VCM connector C3 (additional DTCs may set).
Probe across terminal C3-7 and terminal C3-8 at VCM connector with J 39200 digital multimeter (DMM) on AC voltage.
Remove the fuel pump relay.

Refer to Automatic Transmission Components.

With the vehicle in PARK, crank the engine.

Is the voltage above the specified value?

0.5 volts AC

Go to Step 12

Go to Step 4

Turn the ignition switch to the OFF position.
Remove the connector from the AT ISS sensor.
Using the J 39200 DMM and J 35616-A connector test adaptor kit, measure the resistance between terminal A and terminal B of the AT ISS sensor.

Is the sensor's resistance within the specified value?

1042-2088ohms

Go to Step 5

Go to Step 11

Select AC volts on the J 39200 DMM.
With the vehicle in PARK, crank the engine.

Is the J 39200 DMM voltage greater than the specified value?

0.5 volts AC

Go to Step 7

Go to Step 6

Remove the AT ISS sensor from the transmission.
Inspect the AT ISS sensor.
Inspect the forward clutch housing for damage (rotor teeth).

Was the condition found?

Go to Step 14

Go to Step 11

Inspect circuit 1230 (RED/BLK) for an open or short to ground.

Refer to General Electrical Diagnosis in Wiring Systems.

Was a condition found?

Go to Step 8

Go to Step 9

Repair the open or short to ground in circuit 1230 (RED/BLK).

Refer to Wiring Repairs in Wiring Systems.

Was the condition corrected?

Go to Step 14

Inspect circuit 1231 (BLU/WHT) for an open or short to ground.

Refer to General Electrical Diagnosis in Wiring System.

Was a condition found?

Go to Step 10

Go to Diagnostic Aids

Repair the open or short to ground in circuit 1231 (BLU/WHT).

Refer to Wiring Repairs in Wiring Systems.

Was the condition corrected?

Go to Step 14

Replace the ISS sensor.

Refer to Vehicle Speed Sensor Replacement .

Is the replacement complete?

Go to Step 14

Inspect the VCM pins for corrosion or reduced terminal tension.
Inspect the VCM C3 connector terminals for corrosion or reduced terminal tension.

Was the condition found?

Go to Step 14

Go to Step 13

Replace the VCM.

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

Is the replacement complete?

Go to Step 14

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.

•	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 Controls Schematics Diesel
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The automatic transmission input (shaft) speed (AT ISS) sensor provides transmission input speed to the powertrain control module (PCM). The AT 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 P0502 or P0503.

•	No TFP manual valve position switch DTC P1810, P1815, P1816, P1817 or P1818.

•	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 for 7 seconds.

Conditions for Setting the DTC

The AT 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).

•	The PCM defaults the transmission to maximum line pressure.

•	The PCM freezes shift adapts.

•	The PCM stores DTC P0717 in PCM history.

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 clears the DTC from PCM history.

•	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

•	Inspect the wiring at the PCM, the transmission connector and all other circuit connecting points for the following conditions:

-	A backed out terminal

-	A damaged terminal

-	Reduced terminal tension

-	A chafed wire

-	A broken wire inside the insulation

-	Moisture intrusion

Corrosion

•	When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.

•	First, diagnose and clear any engine DTCs that are present. Then, inspect for any transmission DTCs that may have reset. If DTC P0717 and DTC P0731, P0732, P0733 or P0734 are present, diagnose DTC P0717 first.

Test Description

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

This step tests for proper operation of the AT ISS sensor.

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

DTC P0717 (Diesel)

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 .
With the engine OFF, turn the ignition switch to the RUN position.

Record the Freeze Frame and Failure Records.
Clear the DTC.

Important: If a DTC P0731, P0732, P0733 or P0734 is also present, refer to the Diagnostic Aids.

Disconnect the wiring harness at the input shaft speed sensor.
Using the J 39200 digital multimeter (DMM) and the J 35616 connector test adapter kit, connect the test leads to the AT ISS sensor terminals. Using the J 39200 DMM, measure the resistance.
Measure the resistance of the AT ISS sensor.

Is the resistance within the specified value?

1042-2088ohms

Go to Step 3

Go to Step 9

With the leads on the AT ISS sensor, select AC volts on the J 39200 DMM.
With the selector in PARK position, start the engine and idle above 700 RPM.

Is the DMM voltage greater than the specified value?

3.0 volts AC

Go to Step 4

Go to Step 9

Reconnect the AT ISS harness to the sensor.
With the ignition in the OFF position, disconnect the PCM connector C1.
Probe across terminals 46 and 47 at the PCM connector C1 with the J 39200 DMM on AC voltage.
Remove the fuel solenoid fuse located in the Fuse/Relay Center.

Refer to Automatic Transmission Components.