Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT COMBINATION METER ASSEMBLY
(a) Check speedometer operation
NOTICE:
- The combination meter assembly receives the vehicle speed signal from the brake actuator assembly (skid control ECU) via CAN communication. Therefore, perform the following inspection referring to values on the Data List of the brake actuator assembly (skid control ECU) because it is the source of the vehicle speed signal.
- Data List values of the brake actuator assembly (skid control ECU) are used for this inspection. Therefore, make sure to perform this inspection after confirming that DTCs are not output.
- If the tire size or tire inflation pressure is not within the specified range, or the tires are excessively worn, the speedometer indication error will increase. Therefore, make sure to perform this inspection after checking that the tire size, tire inflation pressure and tire wear are in the specified range.
(1) Warm up the engine.
(2) Connect the Techstream to the DLC3.
(3) Turn the engine switch on (IG).
(4) Turn the Techstream on.
(5) Enter the following menus: Chassis / Brake/EPB / Data List.
(6) Read the Data List according to the display on the Techstream.
Chassis > Brake/EPB > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Vehicle Speed | Maximum wheel speed sensor reading | Min.: 0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) | Vehicle stopped: 0 km/h (0 mph) | When driving at constant speed: No large fluctuations |
| Tester Display |
|---|
| Vehicle Speed |
-
for Optitron Meter Type Reference mph (for speedometer with Imperial Units Main Scale)
Reference km/h (for speedometer with Metric Units Main Scale)Techstream Indication (mph)
Acceptable Range (mph)
20
19.3 to 21.8
40
39.6 to 42.4
60
60.2 to 63.0
80
80.5 to 83.7
100
101.0 to 104.2
120
121.5 to 124.7
140
142.0 to 145.2
Techstream Indication (km/h)
Acceptable Range (km/h)
20
18.5 to 22.5
40
38.8 to 43.3
60
59.4 to 63.9
80
79.6 to 84.6
100
100.1 to 105.1
120
120.6 to 125.6
140
141.1 to 146.1
160
161.7 to 166.7
180
182.2 to 187.2
200
202.7 to 207.7
220
223.2 to 228.2
240
243.7 to 248.7
OK:
Speedometer reading is within the acceptable range at each vehicle speed.
-
for TFT Meter Type Reference mph (for speedometer with Imperial Units Main Scale)
Reference km/h (for speedometer with Metric Units Main Scale)Techstream Indication (mph)
Acceptable Range (mph)
20
19.3 to 21.8
40
39.6 to 42.4
60
60.2 to 63.0
80
80.5 to 83.7
100
101.0 to 104.2
120
121.5 to 124.7
140
142.0 to 145.2
Techstream Indication (km/h)
Acceptable Range (km/h)
20
18.5 to 22.5
40
38.8 to 43.3
60
59.4 to 63.9
80
79.6 to 84.6
100
100.1 to 105.1
120
120.6 to 125.6
140
141.1 to 146.1
160
161.7 to 166.7
180
182.2 to 187.2
200
202.7 to 207.7
220
223.2 to 228.2
240
243.7 to 248.7
OK:
Speedometer reading is within the acceptable range at each vehicle speed.
(b) Inspect tachometer
(1) Warm up the engine.
(2) Connect the Techstream to the DLC3.
(3) Turn the engine switch on (IG).
(4) Turn the Techstream on.
(5) Enter the following menus: Powertrain / Engine / Data List.
(6) Read the Data List according to the display on the Techstream.
Powertrain > Engine > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Engine Speed | Engine speed | Min.: 0 rpm, Max.: 16383 rpm | 650 to 750 rpm: Idling (shift lever in N, engine warmed up and A/C off) | When the crankshaft position sensor is malfunctioning, "Engine Speed" is approximately 0 rpm or varies greatly from the actual engine speed. |
| Tester Display |
|---|
| Engine Speed |
| Techstream Indication (rpm) | Acceptable Range (rpm) Data in ( ) is for Reference |
|---|---|
| 700 | 630 to 770 |
| 1000 | (900 to 1100) |
| 2000 | (1850 to 2150) |
| 3000 | 2800 to 3200 |
| 4000 | (3800 to 4200) |
| 5000 | 4800 to 5200 |
| 6000 | (5750 to 6250) |
OK:
Tachometer reading is within the acceptable range at each engine speed.
(c) Check LED illumination (LED check)
(1) Check the illumination function of the warning or indicator lights listed below when turning the engine switch on (IG).
OK:
| Warning or Indicator Light | Specified Condition |
|---|---|
| Brake warning light / red (malfunction) | Warning or indicator light comes on for about 3 seconds after turning the engine switch on (IG). |
| VSC OFF indicator light | |
| Slip indicator light | |
| ABS warning light | |
| Tire pressure warning light | |
| PCS warning light | |
| Eco driving indicator light*1 | |
| Master warning light | |
| Brake warning light / yellow (minor malfunction) | |
| Brake hold indicator light | |
| ICS OFF indicator light*2 | |
| SRS warning light | Warning light comes on for about 6 seconds after turning the engine switch on (IG). |
| AWD lock indicator light*3 | Warning light comes on for about 4 seconds after turning the engine switch on (IG). |
| Charge warning light*4 | Warning light comes on when the engine switch is on (IG). |
| MIL (Check engine warning light) | |
| EPS warning light |
- *1: w/ Turns on only when the ECO customize setting is set to on.
- *2: w/ Intelligent Clearance Sonar System
- *3: for AWD
- *4: for TFT Meter Type
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART Meter / Gauge System DTC No. Detection Item Memory Note Link B1321 Lost Communication with EMV DTC stored - B1326 Lost Communication with ...
Lost Communication with EMV (B1321)
DESCRIPTION After the combination meter assembly has started, the combination meter assembly attempts to detect the radio receiver assembly by performing communication via local bus. This DTC is store ...
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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