P1750
DTC P1750 WHEEL SPEED SENSOR SIGNAL (FL)
COMPONENT LOCATION
GENERAL DESCRIPTION
When the tone wheel rotates adjacent to the sensor pole piece, an alternating current signal is generated in the coil with a frequency proportioning to the wheel speed.
This signal which is generated from the wheel speed sensor is inputted to the 4WD EM
DTC DESCRIPTION
The DTC will set when there is no wheel speed sensor signal.
DTC DETECTING CONDITION
SCHEMATIC DIAGRAM
WAVEFORM INSPECTION
TERMINAL & CONNECTOR INSPECTION
1. Many malfunctions in the electrical system may be caused from poor harness and terminals. These faults can be caused by interference from other electrical systems and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Has a problem been found?
YES Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO Go to the next procedure.
SIGNAL CIRCUIT INSPECTION
1. FLSS (Front Left Speed Sensor) Signal Inspection
1) IG KEY ON, ENG ON
2) 4WD ECM connector: Connect.
3) Monitor signal waveform between terminal 18 of 4WD ECM harness connector and chassis ground.
4) Start and drive vehicle in gear and maintain vehicle speed is approximately 10 km/h or less (6 mph or less).
Specification: refer to "Waveform Inspection"
Is FLSS Signal display near the specified value?
YES This may caused by intermittent fault. Verify data changeability by shaking the harness.
NO Inspect ground to short of FLSS circuit.
^ Inspect open or short of FLSS circuit.
^ Check for FLSS and replace it as necessary.
^ Check for 4WD ECM and replace it as necessary.
2. FLSS open inspection
1) IG KEY OFF, ENG OFF
2) 4WD ECM connector and FLSS connector: Disconnect.
3) Measure resistance between terminal 18 of 4WD ECM harness connector and terminal 2 of FLSS harness connector.
Specification: Approximately 0 ohms
Is resistance display near the specified value?
YES Proceed next inspection procedure.
NO Repair open circuit of FLSS circuit.
If problem is solved, go to the "Verification of Vehicle Repair".
3. FLSS ground circuit open inspection
1) IG KEY OFF, ENG OFF
2) 4WD ECM connector and FLSS connector: Disconnect.
3) Measure resistance between terminal 6 of 4WD ECM harness connector and terminal 1 of FLSS harness connector.
Specification: Approximately 0 ohms
Is resistance display near the specified value?
YES Proceed next inspection procedure.
NO Repair open circuit of FLSS circuit.
If problem is solved, go to the "Verification of Vehicle Repair".
GROUND CIRCUIT INSPECTION
1. FLSS short to ground inspection
1) IG KEY OFF, ENG OFF
2) 4WD ECM connector and FLSS connector: Disconnect.
3) Measure resistance between terminal 18 of 4WD ECM harness connector and chassis ground.
Specification: Approximately 0 ohms
Is resistance display near the specified value?
YES Proceed next inspection procedure.
NO Repair ground to short circuit of FLSS circuit.
If problem is solved, go to the "Verification of Vehicle Repair".
COMPONENT INSPECTION
1. IG KEY: OFF, Engine: OFF
2. 4WD ECM connector and FLSS connector: Disconnect.
3. Measure resistance between terminal 1 & 2 of FLSS harness connector.
Specification: Approximately 1.1 ± 0.05k Ohms
NOTE: The above value is just for reference. The data from vehicle may differ from it according as various vehicle condition. This inspection is for checking open or short of FLSS.
Is resistance display near the specified value?
YES Proceed next inspection procedure.
NO Replace the front left speed sensor.
If problem is solved, go to the "Verification of Vehicle Repair".
VISUAL/PHYSICAL INSPECTION
1. FLSS Air Gap Inspection
1) IG KEY: OFF, Engine: OFF.
2) 4WD ECM connector and FLSS connector i Disconnect.
3) Measure air gap between wheel speed sensor and rotor.
Specification: Front Air-gap: 0.3 - 0.9 mm (0.0118 - 0.0354 inch)
Is the air gap in the range of the specified value?
YES Replace with normal 4WD ECM temporarily and check if vehicle run normally. If trouble is disappeared, replace 4WD ECM.
If problem is solved, go to the "Verification of Vehicle Repair".
NO Adjust the air gap.
If problem is solved, go to the "Verification of Vehicle Repair".
VERIFICATION OF VEHICLE REPAIR
1. IG KEY ON, ENG ON
2. 4WD ECM connector and FLSS connector: Connect.
3. Clear the DTC with a scan tool.
4. Start and drive vehicle in gear and maintain vehicle speed is approximately 10 km/h or less (6 mph or less).
5. Check FLSS signal and verify the malfunction.
Does the scan tool display any DTC relevant to FLSS signal?
YES Go to the applicable troubleshooting procedure.
NO System OK.