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Home >> Saturn >> 2002 >> LW300 >> Repair and Diagnosis >> External Pages >> Different car >> Section 314 (Automatic Transaxle - 4T40-E/4T45-E - Diagnosis (DTC P0218 To DTC P0717)) >> Diagnostic Trouble Codes >> DTC P0502 (2.2L (L61)) >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Saturn LW300, 2003 Saturn LW200, 2003 Saturn L300, and 2003 Saturn L200. 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 AT OSS to produce an AC voltage. This step also verifies the integrity of the wiring to the PCM.
  2. 4:  This step tests the AT OSS circuit for correct resistance.
DTC P0502 (2.2L (L61))

Step Action Value(s) Yes No
1 Did you perform the Diagnostic System Check - Engine Controls? - Go to Step 2  Go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS in Self-Diagnostics - 3.0L or DIAGNOSTIC SYSTEM CHECK -- ENGINE CONTROLS in Self-Diagnostics - 2.2L
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
    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 the PCM.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
    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 INTERMITTENTS for 2.2L or INTERMITTENT CONDITIONS for 3.0L Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the PCM connectors C1 and C2.
  3. Using the J-35616  connector test adapter kit, connect the DMM between PCM terminal C2-64 and C2-42.
  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 ohm Go to Step 8  Go to Step 5 
5 Is the circuit resistance greater than the specified value? 1,870 ohm Go to Step 11  Go to Step 6 
6
  1. Leave the DMM test leads connected.
  2. Disconnect the AT OSS connector at the transmission.
Is the circuit resistance less than the specified value?		 1,530 ohm Go to Step 7  Go to Step 13 
7 Test the high signal circuit (CKT 400) and the low signal circuit (CKT 401) of the AT OSS for being shorted together.
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  -
8 Test the high signal circuit (CKT 400) of the AT OSS for a short to ground.
Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 9 
9
  1. Connect PCM connectors C1 and C2.
  2. Select DC volts on the DMM.
  3. Using the J-35616  connector test adapter kit, connect the DMM test leads to terminal A and B of the AT OSS wiring harness connector end.
  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 (CKT 400) of the AT OSS for a short to voltage.
Refer to Testing for a Short to Voltage and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  -
11
  1. Test the high signal circuit (CKT 400) of the AT OSS for an open.
  2. Test the low signal circuit (CKT 401) of the AT OSS for an open.
Refer to Testing for Continuity and Wiring Repairs in Wiring Systems.Did you find and correct a condition?		 - Go to Step 15  Go to Step 13 
12
  1. Remove the AT OSS.

    Refer to Vehicle Speed Sensor (VSS) Replacement

  2. Inspect the AT OSS and the transmission for the following conditions:
    • Incorrect AT OSS
    • AT OSS damage
    • Excessive AT 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 InstallationDid you complete the repair?		 - Go to Step 15  -
13 Replace the AT OSS.
Refer to Vehicle Speed Sensor (VSS) Replacement .
Did you complete the replacement?		 - Go to Step 15  -
14 Replace the PCM.
Refer to POWERTRAIN CONTROL MODULE in Removal & Installation.
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 greater than 250 RPM for 2 seconds.
  4. Select Specific DTC.
  5. Enter DTC P0502.

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 TESTS in Self-Diagnostics - 2.2L or DIAGNOSTIC TESTS in Self-Diagnostics - 3.0L System OK
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