LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1159 (Manual Transmission - AISIN AY6) >> Diagnostic Information and Procedures >> DTC P0501 >> Conditions for Clearing the MIL/DTC

Conditions for Clearing the MIL/DTC

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
Step Action Values 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 DTCs, use the scan tool in order to record the Freeze Frame and Failure Records for reference. Using the Clear Info function erases the Freeze Frame and Failure Records from the ECM.
  3. Clear the DTCs.
    4. 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.
  4. Raise the drive wheels.
  5. Start and idle the engine.
  6. Place the transmission in 1st gear.
  7. Monitor Vehicle Speed on the scan tool.
  8. With the drive wheels rotating, increase and decrease the throttle position.
Does the scan tool indicate Vehicle Speed increasing when wheel speed increases?		 - Refer to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3
  1. Turn OFF the ignition.
  2. Disconnect the VSS.
  3. Turn ON the ignition, with the engine OFF.
  4. Using the DMM, measure the voltage of ignition 1 voltage circuit of the VSS to ground.
Does the voltage measure near the specified value?		 B+ Go to Step 4  Go to Step 9 
4 Measure the voltage from the ignition 1 voltage circuit of the VSS to the VSS ground circuit at the VSS connector.
Does the voltage measure near the specified value?		 B+ Go to Step 5  Go to Step 12 
5
  1. Using a fused jumper wire, jumper the ignition 1 voltage circuit of the VSS between the VSS connector and the VSS.
  2. Using a fused jumper wire, jumper the ground circuit of the VSS between the VSS connector and the VSS.
  3. Using the J 35616  GM terminal test kit, connect the DMM between the VSS signal circuit of the VSS and ground.
  4. Turn ON the ignition, with the engine OFF.
  5. Select AC volts on the DMM.
  6. Place the transmission in NEUTRAL.
  7. Rotate the rear wheels by hand while observing the DMM AC volts.
Does the DMM display AC volts above the specified value?		 0.15 V Go to Step 6  Go to Step 16 
6
  1. Turn OFF the ignition.
  2. Disconnect the ECM.
  3. Using the DMM, measure the resistance of the VSS signal circuit between the VSS signal at the ECM and the VSS signal at the VSS connector.
Does the resistance measure less than the specified value?		 5 Ω Go to Step 7  Go to Step 13 
7 Using the DMM, measure the resistance between the VSS signal circuit and ground.
Is the resistance less than the specified value?		 10 M Ω Go to Step 14  Go to Step 8 
8 Using a test light connected to the ground, probe the VSS signal circuit.
Does the test light illuminate?		 - Go to Step 15  Go to Step 18 
9
  1. Inspect the fuse in the ignition 1 voltage circuit for an open.
  2. Replace the fuse, if necessary.
Was the fuse open?		 - Go to Step 10  Go to Step 11 
10
IMPORTANT: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution.
Test the ignition 1 circuit of the VSS for a short to ground.Did you find and correct the condition?		 - Go to Step 19  -
11 Test for an open or high resistance in the ignition 1 voltage circuit of the VSS. Refer to Testing for Continuity .
Did you find and correct the condition?		 - Go to Step 19  -
12 Repair the open in the VSS ground circuit. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 19  -
13 Repair the open in the VSS signal circuit.
Did you complete the repair?		 - Go to Step 19  -
14 Repair the short to ground in the VSS signal circuit. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 19  -
15 Repair the short to voltage on the VSS signal circuit. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 19  -
16
  1. Remove the VSS sensor. Refer to Vehicle Speed Sensor Replacement .
  2. Inspect the VSS and the transmission for the following:
    • Incorrect VSS
    • VSS damage
    • Excessive VSS to rotor gap
    • Incorrect VSS rotor alignment
    • VSS rotor damage
  3. Repair any of the above conditions.
Did you find and correct the condition?		 - Go to Step 19  Go to Step 17 
17 Replace the VSS. Refer to Vehicle Speed Sensor Replacement .
Did you complete the repair?		 - Go to Step 19  -
18 Replace the ECM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the repair?		 - Go to Step 19  -
19 In order to verify your repair, perform the following procedure:
  1. Select DTC.
  2. Select Clear Info.
  3. Drive the vehicle.
  4. Ensure the vehicle speed is greater than 5 km/h (3 mph) for at least 3 seconds.
  5. Select specific DTC.
  6. Enter DTC P0501.

Has the test run and passed?		 - Go to Step 20  Go to Step 2 
20 With a 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
scientia non olet · About LEMON Manuals