DTC P0723 Non-Hybrid
Circuit Description
The automatic transmission output speed sensor (OSS) provides vehicle speed information to the transmission control module (TCM). The OSS is a permanent magnet generator mounted to the transmission case. The OSS produces an AC voltage as the transmission speed sensor rotor teeth pass through the magnetic field of the sensor. The AC voltage level increases as the speed of the vehicle increases. The TCM converts the AC voltage into a digital signal. The TCM uses the vehicle speed signal to determine shift timing, torque converter clutch (TCC) apply, TCC release, and gear ratio calculations.
When the TCM detects a loss of vehicle speed while the vehicle is in motion, DTC P0723 sets. DTC P0723 is a type B DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0723 Output Speed Sensor Circuit Intermittent
Conditions for Running the DTC
| • | No MAP DTCs P0107 or P0108. |
| • | No ISS DTCs P0716 or P0717. |
| • | No 1-2 Shift Solenoid Electrical DTC P0974. |
| • | The engine is running for 5 seconds and not in fuel cut-off. |
| • | The output speed is greater than 304 RPM for more than 2 seconds. |
| • | An increase in output speed of 152 RPM or greater has not occurred for greater than 2 seconds. |
| • | An increase in input speed of 500 RPM or greater has not occurred for greater than 2 seconds. |
| • | The engine torque is greater than 50 N·m (37 lb ft). |
| • | The time since the last range change is greater than 6 seconds. |
Conditions for Setting the DTC
The output speed drops by greater than 365 RPM for 3.3 seconds.
Action Taken When the DTC Sets
| • | The TCM requests the engine control module (ECM) to illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met. |
| • | The TCM commands maximum line pressure. |
| • | The TCM freezes transmission adaptive functions. |
| • | The TCM calculates output speed from input speed, engine speed, and commanded gear. |
| • | The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records. |
| • | The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records. |
| • | The TCM stores DTC P0723 in TCM history during the second consecutive trip in which the Conditions for Setting the DTC are met. |
Conditions for Clearing the MIL/DTC
| • | The ECM turns OFF the MIL after the third consecutive drive trip in which the TCM does not send a MIL illumination request. |
| • | A scan tool can clear the MIL/DTC. |
| • | The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring. |
| • | The TCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the TCM. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests the ability of the OSS to produce an AC voltage. This step also verifies the integrity of the wiring to the PCM.
-
This step tests the OSS circuit for correct resistance.
Step | Action | Value(s) | Yes | No | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||||||
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 the Freeze Frame and Failure Records from both the ECM and the TCM. Notice: Support the lower control arms in the normal horizontal position in order to avoid damage to the drive axles. Do not operate the vehicle in gear with the wheels hanging down at full travel. With the drive wheels rotating, does Transmission OSS increase when the wheel speed increases? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | ||||||||||
Can a voltage greater than the specified value be obtained? | 0.5 V AC | Go to Step 14 | Go to Step 4 | |||||||||||
Is the circuit resistance within the specified range? | 1,530-1,870 Ω | Go to Step 8 | Go to Step 5 | |||||||||||
5 | Is the circuit resistance greater than the specified value? | 1,870 Ω | Go to Step 11 | Go to Step 6 | ||||||||||
6 |
Is the circuit resistance less than the specified value? | 1,530 Ω | Go to Step 7 | Go to Step 13 | ||||||||||
7 | Test the high signal circuit and the low signal circuit of the OSS for being shorted together. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 15 | -- | ||||||||||
8 | Test the high signal circuit of the OSS for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 9 | ||||||||||
9 |
Does the DMM display system voltage? | -- | Go to Step 10 | Go to Step 12 | ||||||||||
10 | Test the high signal circuit of the OSS for a short to voltage. Refer to Testing for a Short to Voltage and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 15 | -- | ||||||||||
11 |
Refer to Testing for Continuity and Wiring Repairs. Did you find and correct a condition? | -- | Go to Step 15 | Go to Step 13 | ||||||||||
12 |
Did you complete the repair? | -- | Go to Step 15 | -- | ||||||||||
13 | Replace the OSS. Refer to Vehicle Speed Sensor Replacement. Did you complete the replacement? | -- | Go to Step 15 | -- | ||||||||||
14 | Replace the TCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 15 | -- | ||||||||||
15 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 16 | Go to Step 2 | ||||||||||
16 | With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK |
DTC P0723 Hybrid
Circuit Description
The automatic transmission output speed sensor (OSS) provides vehicle speed information to the transmission control module (TCM). The OSS is a permanent magnet generator mounted to the transmission case. The OSS produces an AC voltage as the transmission speed sensor rotor teeth pass through the magnetic field of the sensor. The AC voltage level increases as the speed of the vehicle increases. The TCM converts the AC voltage into a digital signal. The TCM uses the vehicle speed signal to determine shift timing, torque converter clutch (TCC) apply, TCC release, and gear ratio calculations.
When the TCM detects a loss of vehicle speed while the vehicle is in motion, then DTC P0723 sets. DTC P0723 is a type B DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0723 Output Speed Sensor Circuit Intermittent
Conditions for Running the DTC
| • | No ISS DTCs P0716 or P0717. |
| • | No 1-2 SS electrical DTC P0974. |
| • | The engine is running for 2 seconds. |
| • | The transmission range is not in PARK or NEUTRAL. |
| • | The output speed is 1,000 RPM or more for 2 seconds. |
| • | An increase in output speed of 500 RPM or greater has not occurred for greater than 2 seconds. |
| • | The engine torque is greater than 50 N·m (37 lb ft). |
| • | The ISS has not changed by 500 RPM or more for 2 seconds. |
| • | The time since the last range change is 6 seconds or more. |
Conditions for Setting the DTC
Output speed drops greater than 1,200 RPM for 3.25 seconds.
Action Taken When the DTC Sets
| • | The TCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met. |
| • | The TCM commands maximum line pressure. |
| • | The Hybrid control module (HCM) inhibits Hybrid operation. |
| • | The TCM freezes transmission adaptive functions. |
| • | The TCM calculates output speed from input speed, engine speed, and commanded gear. |
| • | The TCM records the operating conditions when the conditions for setting the DTC are met. The TCM stores this information as Freeze Frame and Failure Records. |
| • | The TCM stores DTC P0723 in TCM history during the second consecutive trip in which the Conditions for Setting the DTC are met. |
Conditions for Clearing the MIL/DTC
| • | The TCM 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. |
| • | The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission related diagnostic fault occurring. |
| • | The TCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the TCM. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests the ability of the OSS to produce an AC voltage. This step also verifies the integrity of the wiring to the TCM.
-
This step tests the OSS circuit for correct resistance.
Step | Action | Value(s) | Yes | No | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||||||
2 |
Important: Before clearing the DTC, use the scan tool to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the TCM. Notice: Support the lower control arms in the normal horizontal position in order to avoid damage to the drive axles. Do not operate the vehicle in gear with the wheels hanging down at full travel. With the drive wheels rotating, does Transmission OSS increase when the wheel speed increases? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | ||||||||||
Can a voltage greater than the specified value be obtained? | 0.5 V AC | Go to Step 14 | Go to Step 4 | |||||||||||
Is the circuit resistance within the specified range? | 1,530-1,870 Ω | Go to Step 8 | Go to Step 5 | |||||||||||
5 | Is the circuit resistance greater than the specified value? | 1,870 Ω | Go to Step 11 | Go to Step 6 | ||||||||||
6 |
Is the circuit resistance less than the specified value? | 1,530 Ω | Go to Step 7 | Go to Step 13 | ||||||||||
7 | Test the high signal circuit and the low signal circuit of the OSS for being shorted together. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 15 | -- | ||||||||||
8 | Test the high signal circuit of the OSS for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 9 | ||||||||||
9 |
Does the DMM display system voltage? | -- | Go to Step 10 | Go to Step 12 | ||||||||||
10 | Test the high signal circuit of the OSS for a short to voltage. Refer to Testing for a Short to Voltage and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 15 | -- | ||||||||||
11 |
Refer to Testing for Continuity and Wiring Repairs. Did you find and correct a condition? | -- | Go to Step 15 | Go to Step 13 | ||||||||||
12 |
Refer to Vehicle Speed Sensor Replacement.
Refer to Final Drive Assembly Disassemble or Output Speed Sensor Installation. Did you complete the repair? | -- | Go to Step 15 | -- | ||||||||||
13 | Replace the OSS. Refer to Vehicle Speed Sensor Replacement. Did you complete the replacement? | -- | Go to Step 15 | -- | ||||||||||
14 | Replace the TCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 15 | -- | ||||||||||
15 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 16 | Go to Step 2 | ||||||||||
16 | With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK |
