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P0717






P0717-INPUT SPEED SENSOR 1 CIRCUIT NO SIGNAL





For a complete wiring diagram refer to Diagrams/Electrical. Electrical Diagrams


Theory of Operation


The Input Speed sensor is used to calculate torque converter speed ratio. The Input Speed sensor is also used together with Output Speed sensor to calculate gear ratios.


Condition One:


When Monitored:
- Output Speed is greater than 250 rpm for 4 seconds.
- Transmission Range is not in Park or Neutral.
- Engine Speed is greater than 300 rpm.
- Transmission is not currently in a gear change.

Set Condition:
- 32,000 consecutive Output Speed sensor pulses without Input Speed sensor pulses for 2 consecutive Ignition cycles.

Condition Two:


When Monitored:
- Wheel Speed is greater than 360 rpm.
- Transmission Range is not in Park or Neutral.
- Engine Speed is greater than 550 rpm.
- Transmission is not currently in a gear change.

Set Condition:
- 500 consecutive Wheel Speed sensor pulses without Input Speed sensor pulses for 2 consecutive Ignition cycles.







Always perform the AS68RC Pre-Diagnostic Troubleshooting procedure before proceeding. AS68RC Pre-Diagnostic Troubleshooting Procedure



Diagnostic Test


1. CHECK IF THE DTC IS CURRENT

Ignition on, engine not running.

With the scan tool, read Transmission DTCs.

Record the Freeze Frame data for the reported DTC.

With the scan tool, erase DTCs.

Using the Freeze Frame data recorded earlier, try to duplicate the conditions in which the DTC originally set.


NOTE: It may be necessary to road test the vehicle to duplicate the original set conditions.

With the scan tool, read Transmission DTCs.

Did the DTC reset?

Yes

- Go To 2

No

- Go To 11



2. CHECK THE (T72) 8 VOLT SUPPLY CIRCUIT





Turn the ignition off to the lock position.

Disconnect the Input Speed Sensor harness connector.

Ignition on, engine not running.

Measure the voltage of the (T72) 8 Volt Supply circuit in the Input Speed Sensor harness connector.

Is the voltage 8.0 volts (± 0.2 volts)?

Yes

- Go To 3

No

- Go To 4



3. LOAD TEST THE (T72) 8 VOLT SUPPLY CIRCUIT





Turn the ignition off to the lock position.

Disconnect the TCM C2 harness connector.

Disconnect the Input Speed Sensor and the Output Speed Sensor harness connectors.

Using a jumper wire, ground the (T72) 8 Volt Supply circuit in the Input Speed Sensor harness connector.

Using a 12 volt test light connected to B (+), probe the (T72) 8 Volt Supply circuit on the appropriate terminal of TCM C2 harness connector.

Does the test light illuminate brightly?

Yes

- Go To 6

No

- Go To 4



4. CHECK THE (T72) 8 VOLT SUPPLY CIRCUIT FOR AN OPEN





Turn the ignition off to the lock position.

Disconnect the TCM C2 harness connector.

Measure the resistance of the (T72) 8 Volt Supply circuit between the TCM C2 harness connector and the Input Speed Sensor harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 5

No

- Repair the (T72) 8 Volt Supply circuit for an open.
- Perform AS68RC VERIFICATION TEST. Verification Tests



5. CHECK THE (T72) 8 VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND





Measure the resistance between ground and the (T72) 8 Volt Supply Signal circuit.

Is the resistance below 100k ohms?

Yes

- Repair the (T72) 8 Volt Supply circuit for a short to ground.
- Perform AS68RC VERIFICATION TEST. Verification Tests

No

- Using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM.
- Perform AS68RC VERIFICATION TEST. Verification Tests



6. CHECK THE (T52) INPUT SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN





Disconnect the TCM C1 harness connector.

Disconnect the Input Speed Sensor harness connector.

Measure the resistance of the (T52) Input Speed Sensor Signal circuit between the TCM C1 harness connector and the Input Speed Sensor harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 7

No

- Repair the (T52) Input Speed Sensor Signal circuit for an open.
- Perform AS68RC VERIFICATION TEST. Verification Tests



7. CHECK THE (T52) INPUT SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND





Measure the resistance between ground and the (T52) Input Speed Sensor Signal circuit.

Is the resistance below 100k ohms?

Yes

- Repair the (T52) Input Speed Sensor Signal circuit for a short to ground.
- Perform AS68RC VERIFICATION TEST. Verification Tests

No

- Go To 8



8. CHECK THE (T52) INPUT SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT





Measure the resistance between the (T52) Input Speed Sensor Signal circuit and all other circuits in the TCM C1 harness connector.

Is the resistance below 100k ohms between the (T52) Input Speed Sensor Signal circuit and any other circuit(s) in the TCM C1 harness connector?

Yes

- Repair the (T52) Input Speed Sensor Signal circuit for a short to another circuit(s).
- Perform AS68RC VERIFICATION TEST. Verification Tests

No

- Go To 9



9. CHECK THE (T52) INPUT SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE





Ignition on, engine not running.

Measure the voltage of the (T52) Input Speed Sensor Signal circuit.

Is there any voltage present?

Yes

- Repair the (T52) Input Speed Sensor Signal circuit for a short to voltage.
- Perform AS68RC VERIFICATION TEST. Verification Tests

No

- Go To 10



10. REPLACE THE INPUT SPEED SENSOR

Turn the ignition off to the lock position.

Replace the Input Speed Sensor.

Inspect the internal tone ring for damaged or missing teeth.

Reconnect all connectors.

Clear DTCs and road test the vehicle under the conditions in which the original DTC set.

Did the Input Speed Sensor DTC reset?

Yes

- Using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM.
- Perform AS68RC VERIFICATION TEST. Verification Tests

No

- Test complete.
- Perform AS68RC VERIFICATION TEST. Verification Tests



11. INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set this DTC are not present at this time.

Use the Freeze Frame Data to help duplicate the conditions in which the DTC originally set. Pay particular attention to the DTC set conditions, such as, VSS, MAP, ECT, and Load

Using the schematics as a guide, visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.

Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.

Wiggle the wiring and connectors while checking for any possible open or shorted circuits.

Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.

Were there any problems found?

Yes

- Repair as necessary.
- Perform AS68RC VERIFICATION TEST. Verification Tests

No

- Test Complete.
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