DTC P0717 Input Speed Sensor Circuit No Signal. Cadillac Concours 1997

For 1990-2009 cars
Automatic Transmission Components
TFP Val. Position Sw., TFT Sensor, and A/T ISS Sensor
Handling ESD Sensitive Parts Notice
OBD II Symbol Description Notice

### Circuit Description

The Automatic Transmission Input(Shaft) Speed (A/T ISS) sensor is a permanent magnet with a coil of wire wound around it. The A/T ISS sensor mounts in the transmission case facing the drive sprocket of the input shaft. An air gap of 0.045-0.109 in. between the sensor and the drive sprocket must be maintained so that an accurate AC voltage can be transmitted. Sensor voltage varies from 0.5 volts AC at 100 RPM to more than 100 volts at 8000 RPM. The A/T ISS sensor has a resistance value of 1300-1950 ohms.

When the Powertrain Control Moldule (PCM) detects a low input speed while the vehicle and engine speeds are high, then DTC P0717 sets. DTC P0717 is a Type B DTC.

### Conditions for Setting the DTC

• | No TP DTCs P0121, P0122 or P0123 are set.

• | No VSS DTCs P0502 or P0503 are set.

• | No TFP Val. Position Sw. DTC P1810 is set.

• | The engine is not in fuel cut off.

• | The engine is running for more than 5 seconds.

• | The transmission is not in Park or Neutral.

• | The vehicle speed is greater than 16 km/h (10 mph).

• | The input(shaft) speed is less than 50 RPM for 2 seconds.

### Action Taken When the DTC Sets

• | The PCM illuminates the Malfunction Indicator Lamp (MIL).

• | SERVICE ENGINE SOON, SERVICE TRANSMISSION displays on the Driver Information Center (DIC).

• | The PCM commands default line pressure.

• | The PCM inhibits Torque Converter Clutch.

• | The PCM disables steady state adapts.

• | The PCM disables upshift adapts.

• | The PCM disables garage shift adapts.

• | The PCM inhibits garage shift pressure calculations.

• | The PCM calculates input(shaft) speed from vehicle speed and commanded gear.

• | DTC P0717 is stored in the PCM history.

### Conditions for Clearing the MIL/DTC

• | The PCM turns OFF the MIL after three consecutive trips without a failure reported.

• | A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.

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

### Diagnostic Aids

• | Inspect the wiring for poor electrical connections at the PCM. Inspect the wiring for poor electrical connections at the transmission 20-way connector. Inspect the wiring for poor electrical connections at the A/T ISS sensor 2-way connector. Look for the following problems:

- | A bent terminal

- | A backed out terminal

- | A damaged terminal

- | Poor terminal tension

- | A chafed wire

- | A broken wire inside the insulation

- | Moisture intrusion

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

• | Inspect the transmission 20-way connector for transmission fluid.

### Test Description

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

1. This step verifies that the DTC is set, and that Input (Shaft) speed RPM is displayed on the scan tool.

2. This step inspects circuit 1230 and circuit 1231 for an AC voltage.

3. This step verifies that circuit 1231 is not open.

4. This step measures the resistance value of the Automatic Transmission Input (Shaft) Speed sensor and circuitry. The ohmmeter must display a value between 1300-1950 ohms.

5. This step tests for a resistance less than 100 ohms, indicating a possible short to ground in circuit 1230 or circuit 1231.

#### DTC P0717 Input Speed Sensor Circuit Low Input

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Step 2 | Go to A Powertrain On Board Diagnostic (OBD) System Check

2

1. Install the Scan Tool ®.
2. With the engine OFF, turn the ignition switch to the RUN position.

Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records for reference. Using the Clear Info function will erase the stored Freeze Frame and Failure Records from the PCM.

3. Record the DTC Freeze Frame and Failure Records, then clear the DTC.
4. Select Trans. ISS on the scan tool.
5. Start the engine.

Does the scan tool display an Automatic Transmission input speed greater than the specified value?

100 RPM

Go to Diagnostic Aids

Go to Step 3

3

1. Turn the ignition OFF.
2. Disconnect PCM connector C1.
3. Using the J 35616-A Connector Test Adapter Kit, connect the J 39200 DMM from terminal 5 to terminal 6 of the PCM connector.
4. Select AC volts.
5. Crank the engine.

Does the voltmeter display an AC voltage greater than the specified value?

0.5V AC

Go to Step 11

Go to Step 4

4

1. Turn the ignition OFF.
2. Reconnect PCM connector C1.
3. Disconnect the transmission 20-way connector.
4. Install the J 39775 Jumper Harness to the engine side of the 20-way connect
5. Using the J 35616-A Connector Test Adapter Kit, connect the J 39200 DMM from terminal S to ground.
6. Select DC volts.
7. Turn the ignition ON, but keep the engine OFF.

Does the voltmeter display DC volts greater than the specified value?

300 mV DC

Go to Step 6

Go to Step 5

5 | Inspect circuit 1230 of the Engine Wiring Harness for an open or short to ground. Refer to Electrical Diagnosis, Section 8. Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 17
6 | Connect a test lamp from terminal E to terminal V of the engine harness. Does the test lamp light? | -- | Go to Step 8 | Go to Step 7
7 | Inspect circuit 1231 of the Engine Wiring Harness for an open. Refer to Electrical Diagnosis, Section 8. Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 17

8

1. Turn the ignition OFF.
2. Disconnect the J 39775 Jumper Harness from the engine side of the 20-way connector.
3. Install theJ 39775 Jumper Harness to the transmission side of the 20-way connector.
4. Using the J 35616-A Connector Test Adapter Kit, connect the J 39200 DMM from terminal S to terminal V.

Is the resistance value within the specified range?

1300-1950 ohms

Go to Step 13

Go to Step 9

9 | Is the resistance greater than the specified value? | 1950 ohms | Go to Step 10 | Go to Step 11

10

1. Inspect circuit 1230 of the Automatic Transmission Wiring Harness for an open.
2. Inspect circuit 1231 for an open.

Refer to Electrical Diagnosis, Section 8.

Did you find the condition?

--

Go to Step 15

Go to Step 16

11 | Is the resistance less than the specified value? | 1300 ohms | Go to Step 12 | --

12

1. Inspect circuit 1230 of the Automatic Transmission Wiring Harness for a short together.
2. Inspect circuit 1231 for a short together.

Refer to Electrical Diagnosis, Section 8.

Did you find the condition?

--

Go to Step 15

Go to Step 16

13 | Measure the resistance from terminal A to the transmission case. Is the resistance less than the specified value? | 100 ohms | Go to Step 14 | --

14

1. Inspect circuit 1230 of the Automatic Transmission Wiring Harness for a short to ground.
2. Inspect circuit 1231 for a short to ground.

Refer to Electrical Diagnosis, Section 8.

Did you find the condition?

--

Go to Step 15

Go to Step 16

15 | Replace the Automatic Transmission Wiring Harness. Refer to Automatic Transmission Wiring Harness Replacement, in On-Vehicle. Is the replacement complete? | -- | Go to Step 18 | --
16 | Replace the Automatic Transmission Input (Shaft) Speed sensor. Refer to Automatic Transmission Input (Shaft) Speed Sensor Replacement, in On-Vehicle Service. Is the replacement complete? | -- | Go to Step 18 | --
17 | Replace the PCM. Refer to PCM Replacement/Programming Section 6. Is the replacement complete? | -- | Go to Step 18 | --

18

In order to verify your repair, perform the following procedure:

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

3.1. | Start the engine.

3.2. | Allow the engine to run, ensuring that the Input (Shaft) speed is greater than 50 RPM for 2 seconds.

4. Select Specific DTC. Enter DTC P0717.

Has the test run and passed?

--

System OK

Begin the diagnosis again. Go to Step 1