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.
Click here .gif)
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.
Click here
|
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| 2. | RECONFIRM DTC |
(a) Clear the DTCs.
Click here
(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.
Click here
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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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SEE MORE:
Hybrid system precautions
Take care when handling the hybrid system, as it is a high voltage
system
(about 650 V at maximum) as well as contains parts that become extremely
hot when the hybrid system is operating. Obey the warning labels attached to
the vehicle.
System components
The illustration is an example for e
Inspection
INSPECTION PROCEDURE 1. INSPECT MAP LIGHT ASSEMBLY (RAIN SENSOR CIRCUIT) (a) Remove the map light assembly. Click here (b) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition T6-1 (IG) - T6-14 (IG2
