Without ABS
DTC P0501 VEHICLE SPEED SENSOR A RANGE/PERFORMANCENON-ABS VEHICLE
Component Location:
GENERAL DESCRIPTION
A Wheel Speed Sensor (RF) is used by the ECM/PCM to calculate vehicle speed. This sensor is connected directly to the ECM/PCM in non-ABS vehicles. On ABS vehicles, the sensor feeds the ABS control module first; the signal is then sent to the ECM/PCM.
DTC DESCRIPTION
If the vehicle speed signal is below 0.62 MPH during 2 sec. under enable condotions, ECM/PCM sets P0501.
DTC Detecting Condition:
Schematic Diagram (A/T):
Schematic Diagram (M/T):
Signal Waveform & Data:
MONITOR SCANTOOL DATA
1. Connect scantool to Data Link Connector (DLC).
2. Warm up the engine to normal operating temperature.
3. Monitor the "VSS" parameters on the scantool.
4. Are the parameters displayed correctly?
YES - Fault is intermittent caused by poor contact in the sensor's and/or ECM/PCM's connector or was repaired and ECM/PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
NO - Go to "W/Harness Inspection" procedure.
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminal condition. Faults can also be caused by interference from other electrical systems, arid mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES - Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO - Go to "Power Circuit Inspection" procedure.
POWER SUPPLY CIRCUIT INSPECTION
1. Key "ON".
2. Measure voltage between terminal 1/E50 of the wheel speed sensor harness connector and chassis ground. (Connect wheel speed sensor connector)
Specification : Approx B+
3. Is the measured voltage within specification?
YES - Go to "Signal Circuit Inspection" procedure.
NO - Repair open or short to ground in harness, and go to "Verification of Vehicle Repair" procedure.
SIGNAL CIRCUIT INSPECTION
1. Check short to ground in harness.
1. Key "OFF".
2. Disconnect ECM/PCM connector.
3. Disconnect wheel speed sensor connector.
4. Measure resistance between terminal 2/E50 of wheel speed sensor harness connector and chassis ground.
Specification : Infinite
5. Is the measured resistance within specifications?
YES - Go to "Check open in harness".
NO - Repair short to ground in harness, and go to "Verification of Vehicle Repair" procedure.
2. Check open in harness.
1. Key "OFF".
2. Disconnect ECM/PCM connector.
3. Disconnect wheel speed sensor connector.
4. Measure resistance between terminal 60/C01-2 of ECM/PCM harness connector and terminal 2/E50 harness connector.
Measure resistance between terminal 79/C01 of ECM/PCM harness connector and terminal 2/E50 harness connector.
Specification : Approx. below 1 Ohm
5. Is the measured resistance within specifications?
YES - Go to "Component Inspection" procedure.
NO - Repair Open circuit and then, go to "Verification of Vehicle Repair" procedure.
COMPONENT INSPECTION
Specification:
1. Engine "ON".
2. Measure signal waveform of wheel speed sensor while driving.
3. Is the signal waveform normal?
YES - Substitute with a known - good ECM/PCM and check for proper operation. If the problem is corrected, replace ECM/PCM and go to "Verification of Vehicle Repair" procedure.
NOTE: There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by ECM/PCM. Before or after testing ECM/PCM on the vehicle, use this function to reuse the ECM/PCM
NO - Substitute with a known - good wheel speed sensor and check for proper operation. If the problem is corrected, replace wheel speed sensor and go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
3. Are any DTCs present?
YES - Go to the applicable troubleshooting procedure.
NO - System is performing to specification at this time.