DTC P0716 Input Speed Sensor Circuit Intermittent Gas
Circuit Description
The automatic transmission input (shaft) speed (ISS) sensor provides transmission input speed to the vehicle control module (VCM). 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 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 an unreasonably large change in the input speed, in a very short period of time, then DTC P0716 sets. DTC P0716 is a type C DTC. For California emissions vehicles, DTC P0716 is a type B DTC.
Conditions for Running the DTC
| • | No throttle position (TP) sensor DTCs P0121, P0122 or P0123. |
| • | No OSS DTC P0502 or P0503. |
| • | No ISS DTC P0717. |
| • | No shift solenoid DTC P0751 or P0753. |
| • | The TP is greater than 10%. |
| • | The vehicle speed is greater than 25 mph. |
| • | The engine is running greater than 475 RPM for more than 7 seconds. |
Conditions for Setting the DTC
| • | The transmission is not in PARK or NEUTRAL. |
| • | The input speed varies by 1,300 RPM for greater than 5 seconds. |
Action Taken When the DTC Sets
| • | For California emission equipped vehicles the VCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met. For Non-California emission equipped vehicles the malfunction indicator lamp (MIL) is not illuminated. |
| • | The VCM commands maximum line pressure. |
| • | The VCM freezes shift adapts. |
| • | The VCM records the operating conditions when the Conditions for Setting the DTC are met. The VCM stores this information as Freeze Frame (Calif. only) and Failure Records (Calif. and Federal). |
| • | The VCM stores the DTC P0716 in VCM history during the second consecutive trip (Calif.) or the first trip (Federal) in which the Conditions for Setting the DTC are met. |
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 can clear the MIL/DTC. |
| • | 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/or the ignition switch is OFF long enough in order to power down the VCM. |
Diagnostic Aids
| • | First diagnose and clear any engine DTCs or TP sensor codes that are present. Then inspect for any transmission DTCs that may have reset. |
| • | When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change. |
| • | Inspect the connectors at the VCM, 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 to the AT ISS sensor.
-
This step tests for proper AT ISS circuit operation up to the VCM connections. Remove the fuel pump relay in order to eliminate a flooding condition during this step.
Step | Action | Value(s) | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Powertrain Diagnostic System Check? | -- | Go to Powertrain On Board Diagnostic (OBD) System Check (4.3L) or Powertrain On Board Diagnostic (OBD) System Check (5.0/5.7L) or Powertrain On Board Diagnostic (OBD) System Check (7.4L) | |||||
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. Is the Scan Tool Transmission ISS more than 800 RPM? | -- | Go to Diagnostic Aids | ||||||
3 |
Does the sensor resistance measure within the specified value? | 1042-2088ohms | ||||||
4 | Test the signal circuit (CKT 1230) of the ISS sensor for an intermittent open or short to ground between the VCM connector C3-8 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? | -- | ||||||
5 | Test the ground circuit (CKT 1231) of the ISS sensor for an intermittent 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? | -- | ||||||
6 |
Does the voltage measure within the specified value? | 4.0-5.1 volts DC | ||||||
7 |
Does the voltage measure less than the specified value? | 0.2 volts | ||||||
8 | Is the voltage reading in Step 6 greater than the specified value? | 5.1 volts | ||||||
9 | Test the signal circuit (CKT 1230) and the ground circuit (CKT 1231) of the ISS sensor for an intermittent short to B+ voltage or intermittent 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? | -- | -- | |||||
Does the voltage measure above the specified value? | 0.5 volts | -- | ||||||
11 | Replace the ISS sensor. Refer to Vehicle Speed Sensor Replacement . Did you complete the replacement? | -- | -- | |||||
12 | 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? | -- | -- | |||||
13 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | System OK |
DTC P0716 Input Speed Sensor Circuit Intermittent Diesel
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 an unrealistically large change in input speed, then DTC P0716 sets. DTC P0716 is a type B DTC.
Conditions for Running the DTC
| • | No AT ISS sensor DTC P0717. |
| • | No OSS sensor DTCs P0722 or P0723. |
| • | No shift solenoid DTCs P0751 or P0753. |
| • | System voltage is 8.0-18.0 volts. |
| • | Engine speed is greater than 475 RPM. |
| • | The APP angle is greater than 15%. |
| • | Transmission fluid pressure manual valve position switch is not indicating PARK or NEUTRAL. |
| • | The vehicle speed is greater than 32 Km/h (20 mph). |
Conditions for Setting the DTC
The AT ISS varies by more than 1200 RPM within 4 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 commands 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 P0716 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. |
| • | 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. |
| • | When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change. |
| • | You may have to drive the vehicle in order to experience a fault. |
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 circuit operation up to the PCM connections. You remove the fuel solenoid fuse in order to eliminate a flooding condition during this step.
-
This step tests for a short to ground in the AT ISS sensor circuit.
Step | Action | Value(s) | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Powertrain Diagnostic System Check? | -- | ||||||
2 |
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 Freeze Frame and Failure Records from the PCM. Does the Transmission ISS RPM change by more than 1,200 RPM at steady engine speed? | -- | Go to Diagnostic Aids | |||||
3 |
Does the ISS sensor resistance measure within the specified value? | 1042-2088 ohms | ||||||
Is the DMM voltage steady? | Greater than 10.0 volts AC | |||||||
5 |
Does either voltage reading measure greater than the specified value? | 10.5 volts DC | ||||||
6 |
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||||||
7 |
Refer to Automatic Transmission Components . Does the voltage measure greater than the specified value and steady? | 0.4 volts AC | ||||||
With the J 39200 DMM measure the resistance between terminals D1 and D11 of the PCM connector C1. Does the circuit resistance measure within the specified value? | 1042-2088 ohms | |||||||
9 |
Does either resistance measure less than the specified value? | 50K ohms | Go to Diagnostic Aids | |||||
Test the ISS sensor high input circuit (CKT 1230) and the ISS sensor low input (CKT 1231) for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | -- | ||||||
11 | Does the resistance reading from Step 8 measure less than the specified value? | 1042-2088 ohms | ||||||
12 | Test the ISS sensor high input circuit (CKT 1230) and the ISS sensor low input circuit (CKT 1231) for a short together. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | -- | |||||
13 | Test the ISS sensor high input circuit (CKT 1230) and the ISS sensor low input circuit (CKT 1231) for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | -- | |||||
14 | Replace the ISS sensor. Refer to Vehicle Speed Sensor Replacement . Did you complete the replacement? | -- | -- | |||||
15 | Replace the PCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls. Did you complete the replacement? | -- | -- | |||||
16 | Perform the following procedure in order to verify the repair:
Important: Failure to clear codes first may cause poor engine performance and high idle at start up.
Has the test run and passed? | -- | System OK |
