P0723

Circuit Description
Output speed information is provided to the PCM by the OSS, which is a permanent magnet (PM) generator. The PM generator produces a pulsing AC voltage. The AC voltage level and number of pulses increases as the speed of the vehicle increases. The PCM then converts the pulsing voltage to output speed, which is used for calculations. The vehicle speed can be displayed with a scan tool.
This DTC detects a low output speed when there is a high engine speed in a drive gear range. This is a type "B" DTC.





Wiring Diagram

Part 1 Of 3:

Part 2 Of 3:

Part 3 Of 3:

Inspection Procedure



Conditions For Setting The DTC
Drive range
- Engine running time is greater than 5 seconds.
- Output speed is greater then 1300 rpm for 2 seconds.
- NORAW-FORAWLAST <200 rpm for 2 seconds
- NORAW: Latest raw data of output shaft speed.
- NOLAST: filtered pervious data of output speed.
- Transmission negative output speed change is greater than 1300 rpm.
- Conditions met for 3 seconds.

Action During Detection Time
Output speed value is frozen.

Action Taken When The DTC Sets
- Fixed to 4th gear.
- Maximum line pressure.
- Inhibit TCC engagement.
- For lamp illumination, refer to DTC type definition (type B).

Conditions For Clearing The MIL/DTC
- The PCM will turn off the MIL and CHECK TRANS Lamp after three consecutive ignition cycles without a failure reported.
- The DTC can be cleared from the PCM history by using a scan tool.
- The DTC will be cleared from history when the vehicle has achieved 40 warm-up cycles without a failure reported.
- The PCM will cancel the DTC default actions when the fault no longer exists and the ignition is cycled "off" long enough to power down the PCM.

Diagnostic Aids
- A OSS DTC P0723 will set when output speed has been detected and is lost.
- Inspect the wiring for poor electrical connection at the PCM. Look for possible bent, backed out, deformed or damaged terminals. Check for weak terminal tension as well. Also check for a chafed wire that could short to bare metal or other wiring. Inspect for a broken wire inside the insulation.
- When diagnosing for a possible intermittent short or open condition, move the wiring harness while observing test equipment for a change.

Test Description
The numbers refer to the step numbers on the diagnostic chart:
4. This test checks the OSS circuit.
5. This test checks the integrity of the OSS.
7. This test checks the 5-volt and ground circuit of the PCM.