Lexus NX: Different Diameter Tire Malfunction (C1348)
DESCRIPTION
If the hybrid vehicle control ECU receives a signal from the skid control ECU (brake booster with master cylinder assembly) that the AWD system is malfunctioning, the hybrid vehicle control ECU outputs this DTC.
| DTC No. | Detection Item | INF Code | DTC Detection Condition | Trouble Area | Note |
|---|---|---|---|---|---|
| C1348 | Different Diameter Tire Malfunction | 216 | Large difference between front and rear tire revolution when driving straight ahead at a constant speed of 30 km/h or higher |
| HINT: Destination ECU: Hybrid vehicle control ECU |
PROCEDURE
| 1. | CHECK TIRE SIZE |
(a) Check the tire sizes to ensure that the front and rear tire sizes are not different.
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HINT:
If different tire sizes are discovered, replace the tires so that the tire sizes are the same on all 4 wheels.
(b) Adjust the air pressure in the tires.
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|
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| 2. | RECONFIRM DTC |
(a) Clear the DTCs.
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(b) Turn the power switch off.
(c) Turn the power switch on (READY).
(d) Drive the vehicle at a constant speed of 30 km/h or higher for several minutes.
(e) Check if the same DTC is output.
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(f) Check that no electronically controlled brake system speed sensor DTCs are output.
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HINT:
-
If C1348 and electronically controlled brake system DTCs are output simultaneously, check and repair the trouble areas in the electronically controlled brake system.
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-
When a DTC has been stored, the vehicle condition when the DTC was stored can be determined from the freeze frame data.
Hybrid Control System: Click here
Electronically Controlled Brake System: Click here
| Result | Proceed to |
|---|---|
| DTCs not output | A |
| Electronically controlled brake system speed sensor DTCs are output | B |
| Only C1348 is output | C |
| A | .gif) | USE SIMULATION METHOD TO CHECK |
| B | | REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
| C | | REPLACE HYBRID VEHICLE CONTROL ECU |
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