DTC P0717. Chevrolet Chevy C Cab/Chassis HD (GMT 400) 2001

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

Does the voltage measure greater than the specified value?

0.5 V 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 rotor teeth for damage.

Did you find and correct the condition?

Test the AT ISS high signal circuit (CKT 1230) of the ISS sensor for an open or short to ground.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Test the AT ISS low signal circuit (CKT 1231) of the ISS sensor for an open or short to ground.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Intermittent Conditions in Engine Controls

Replace the AT ISS sensor.

Refer to Vehicle Speed Sensor Replacement .

Did you complete the replacement?

Replace the PCM.

Refer to Powertrain Control Module Replacement 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.

•	Vehicle speed greater than 19 km/h (12 mph).

•	The PCM 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 Diesel

Master Electrical Component List
Automatic Transmission Controls Schematics L18
OBD II Symbol Description Notice

Circuit Description

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 for greater than 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 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 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.

•	DTC P0717 defaults to an elevated line pressure condition which may result in TCC partial apply. This may induce idle surge and engine stall.

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

Step

Action

Value(s)

Yes

Did you perform the Powertrain Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Engine Controls in Engine Controls

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

Does the sensor resistance measure within the specified value?

1042-2088 ohms

Go to Step 4

Test the AT ISS high 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 AT 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 AT ISS low signal circuit (CKT 1231) of the ISS sensor for an open between the PCM connector C1-D1 and cavity 2 of the AT 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 AT ISS sensor connector to a good ground.

Does the voltage measure within the specified value?

4.0-5.1 V 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 AT ISS sensor connector.

Does the voltage measure less than the specified value?

0.2 V

Go to Step 10

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

5.1 V

Go to Step 12

Test the AT ISS high signal circuit (CKT 1230) and the AT ISS low signal circuit (CKT 1231) of the ISS sensor for a short to B+ voltage or shorted together between the PCM connector C1 and the AT 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 AT ISS sensor in the transmission.
Reconnect the AT 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 V

Go to Step 12

Replace the AT ISS sensor.

Refer to Vehicle Speed Sensor Replacement .

Did you complete the replacement?

Replace the PCM.

Refer to Powertrain Control Module Replacement in Engine Controls.

Did you complete the replacement?