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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1574 (Automatic Transaxle - 4T45-E - DTC P0719 To DTC P0842) >> DTC P0723 (2.4L Hybrid) >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 3:  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.
  2. 4:  This step tests the OSS circuit for correct resistance.
DTC P0723 (2.4L Hybrid)

Step Action Value(s) Yes No
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
    3. 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.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
    5. NOTE: 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.
  5. Raise and support the drive wheels.
  6. Start and idle the engine.
  7. Place the transmission in DRIVE.
  8. Select Transmission OSS on the scan tool.
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 
3 
  1. Turn OFF the ignition.
  2. Disconnect the TCM connector.
  3. Using the J 35616  GM-approved terminal test kit, connect the DMM between the OSS high signal circuit and the OSS low signal circuit at the TCM connector. See Special Tools .
  4. Select AC volts.
  5. Turn ON the ignition, with the engine OFF.
  6. Rotate the right front drive wheel by hand.
  7. Observe the DMM display.
Can a voltage greater than the specified value be obtained?		 0.5 V AC Go to Step 14  Go to Step 4 
4 
  1. Leave the DMM test leads connected.
  2. Measure circuit resistance.
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
  1. Leave the DMM test leads connected.
  2. Disconnect the OSS connector at the transmission.
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
  1. Connect TCM connector.
  2. Select DC volts.
  3. Using the J 35616  GM-approved terminal test kit, connect the DMM test leads to the OSS high signal circuit and the OSS low signal circuit of the OSS connector. See Special Tools .
  4. Turn ON the ignition, with the engine OFF.
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
  1. Test the high signal circuit of the OSS for an open.
  2. Test the low signal circuit of the OSS for an open.
Refer to Testing for Continuity and Wiring Repairs .Did you find and correct a condition?		 - Go to Step 15  Go to Step 13 
12
  1. Remove the OSS.

    Refer to Vehicle Speed Sensor Replacement .

  2. Inspect the OSS and the transmission for the following conditions:
    • Incorrect OSS
    • OSS damage
    • Excessive OSS to speed sensor rotor gap
    • Incorrect speed sensor rotor alignment
    • Speed sensor rotor damage
  3. Repair any of the above conditions as necessary.
Refer to Final Drive Assembly Disassemble or Output Shaft 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:
  1. Select DTC.
  2. Select Clear Info.
  3. Operate the vehicle and ensure that the transmission OSS is 500 RPM or more for 3 seconds and has not changed by 500 RPM or more.
  4. Select Specific DTC.
  5. Enter DTC P0723.

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?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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