With ABS/ESC
DTC P0501 VEHICLE SPEED SENSOR A RANGE/PERFORMANCEComponent Location:
GENERAL DESCRIPTION
The Wheel Speed Sensor (WSS) generates a waveform with a frequency proportional to the speed of the vehicle. The signal generated by the WSS informs the ECM not only if the vehicle speed is low or high but also if the vehicle is or is not moving. The ECM uses this signal to control the fuel injection, ignition timing, transaxle shift scheduling and torque converter clutch scheduling. The WSS signal is also used to detect rough road conditions.
DTC DESCRIPTION
The ECM evaluates engine speed and mass air flow if there is no vehicle speed signal. This evaluation of both values will detect open circuit or short circuit errors on the wheel speed sensor. The ECM sets DTC P0501 if there is no vehicle speed signal from wheel speed sensor while both engine speed and mass air flow are higher than predetermined threshold during the predetermined time.
DTC Detecting Condition:
Schematic Diagram:
MONITOR DTC STATUS
1. Connect scan tool and select "Diagnostic Trouble Codes(DTCs)".
2. Press F4(DTAL) to select DTC information from the DTCs menu.
3. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Read "DTC Status" parameter.
5. Is parameter displayed "History(Not Present) fault"?
NOTE:
- History (Not Present) fault: DTC occurred but has been cleared.
- Present fault: DTC is occurring at present time.
YES: Fault is intermittent, caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM 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:
- [With ABS/ESC] Go to "Monitor Scan tool Data" procedure.
- [Without ABS system] Go to "Signal Circuit Inspection[Without ABS]" procedure.
MONITOR SCANTOOL DATA
1. With vehicle raised on a lift , start the engine and place transaxle in Drive. Let vehicle idle and verify speedometer indicates approx. 10 km/h or more (6 mph or more) on the instrument cluster.
2. Connect Scantool and select ABS/ESC system.
3. Monitor the "WHEEL SPD SENSOR-FR" parameter on the current data list.
Specification : 10 km/h or more(6 mph or more)
4. Is value within the specification?
YES: Wheel speed sensor is OK. Go to "Signal Circuit Inspection" procedure.
NO: Check the following conditions:
- Open or short circuit between wheel speed sensor(FR) and ABS control module
If problems are found, repair as necessary and go to "Verification of Vehicle Repair" procedure
If OK, check wheel speed sensor(FR). Repair as necessary and go to "Verification of Vehicle Repair" procedure
SIGNAL CIRCUIT INSPECTION
[With ABS/ESC]
1. Check for open in circuit
1. Ignition "OFF".
2. Disconnect ECM and ABS or ESC Control Module connectors.
3. Measure resistance between terminals 22 of the ECM harness connector and 3 of the ABS Control Module harness connector(W/ABS)
4. Measure resistance between terminals 22 of the ECM harness connector and 6 of the ESC Control Module harness connector(W/ESC)
Specification : Approx. 0 ohms
5. Is resistance within the specification?
YES: Go to next step as below.
NO: Repair as necessary and go to "Verification of Vehicle Repair" procedure.
2. Check for short to ground in circuit.
1. Measure resistance between terminal 22 of the ECM harness connector and chassis ground.
Specification : Infinite
2. Is resistance within the specification?
YES: Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO: Repair as necessary 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. Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
3. Read "DTC Status" parameter.
4. Is parameter displayed "History(Not Present) fault"?
YES: System performing to specification at this time. Clear the DTC.
NO: Go to the applicable troubleshooting procedure.