C1728

DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


1. PERFORM DTC CONFIRMATION

With CONSULT
1.Drive for 3 minutes at a speed of 40 km/h (25 MPH) or more, then drive normally for 10 minutes.
2.Stop the vehicle.
3.Perform self-diagnosis for "AIR PRESSURE MONITOR".
Is DTC "C1728" detected?
YES- Proceed to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK TIRE PRESSURE RECEIVER INPUT SIGNAL

1.Turn the ignition switch ON.

CAUTION:
Never start engine.
2.Use an oscilloscope and check the input signal waveform between the low tire pressure warning control unit harness connector and ground.
STANDBY STATUS





WHEN SIGNAL IS RECEIVED





Is the inspection result normal?
YES- Check connector for loose connection and then perform "DTC CONFIRMATION PROCEDURE"
(self-diagnosis) again. Refer to "DTC Logic" .
NO- GO TO 2.

2. CHECK TIRE PRESSURE RECEIVER POWER SUPPLY CIRCUIT

1.Disconnect the tire pressure receiver harness connector.
2.Turn the ignition switch ON.

CAUTION:
Never start the engine.
3.Check the voltage between tire pressure receiver harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace the malfunctioning harness or connector.

3. CHECK TIRE PRESSURE RECEIVER GROUND CIRCUIT

1.Turn the ignition switch OFF.
2.Disconnect low tire pressure warning control unit harness connector and tire pressure receiver harness connector.
3.Check the continuity between low tire pressure warning control unit harness connector and tire pressure receiver harness connector.





Is the inspection result normal?
YES- GO TO 4.
NO- Repair or replace the malfunctioning harness or connector.

4. CHECK LOW TIRE PRESSURE WARNING CONTROL UNIT CIRCUIT

Check the low tire pressure warning control unit circuit. Refer to "Diagnosis Procedure" C1754.
Is the low tire pressure warning control unit circuit normal?
YES- Replace the tire pressure receiver. Refer to "FRONT TIRE PRESSURE RECEIVER : Removal and Installation" Front Tire Pressure Receiver (Front), "REAR TIRE PRESSURE RECEIVER : Removal and Installation" (Rear).
NO- Repair or replace error-detected parts.