Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Check For Intermittent Problems

CHECK FOR INTERMITTENT PROBLEMS

CHECK FOR INTERMITTENT PROBLEMS

HINT:

A momentary interruption (open circuit) in the connectors and/or wire harness between the sensors and ECUs can be detected using the Data List function of the Techstream.

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Follow the directions on the Techstream to display the Data List and select areas where momentary interruption should be monitored.

HINT:

  • A momentary interruption (open circuit) cannot be detected for 3 seconds after the engine switch is turned on (IG) (initial check).
  • If Under intermittent remains displayed for one of the items on the Techstream, check for continuity between the ECU and the item for which Under intermittent is displayed.
  • If a momentary interruption occurs and Under intermittent is displayed on the Techstream, Under intermittent will remain displayed on the Techstream for 1 second after the circuit returns to normal.
Chassis > Brake/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FR Speed Open

Front speed sensor RH open detection

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: C050614, C14E314

FL Speed Open

Front speed sensor LH open detection

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: C050014, C14E014

RR Speed Open

Rear speed sensor RH open detection

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: C051214, C14E914

RL Speed Open

Rear speed sensor LH open detection

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: C050C14, C14E614

EFI Communication Open

ECM communication open detection

Under intermittent or Normal

Under intermittent: ECM communication invalid state detected

Normal: ECM communication invalid state not detected

  • Related Vehicle Control History (RoB): X2079
  • Related DTC: U010087

Yaw Rate Open

Yaw rate sensor open detection

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: U012587

Deceleration Open

Acceleration sensor open detection

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: U012587

Steering Open

Steering angle sensor open detection

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: U012687

Master Cylinder Open

Master cylinder pressure sensor open detection

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: C054031

FR Speed Sensor Voltage Open

Front speed sensor RH voltage open detection

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: C05061F

FL Speed Sensor Voltage Open

Front speed sensor LH voltage open detection

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: C05001F

RR Speed Sensor Voltage Open

Rear speed sensor RH voltage open detection

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: C05121F

RL Speed Sensor Voltage Open

Rear speed sensor LH voltage open detection

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: C050C1F

M/C Pressure Sensor Noise

Master cylinder pressure sensor noise detection

Under intermittent or Normal

Under intermittent: Noise detected

Normal: Noise not detected

Related DTC: C05401F

Brake Pedal Switch Open

Brake pedal load sensing switch open detection

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: C004013

Yaw Rate Sensor Voltage Open

Yaw rate sensor voltage open detection

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: C14D71C

EFI Communication Invalid

ECM communication invalid detection

Under intermittent or Normal

Under intermittent: ECM communication invalid state detected

Normal: ECM communication invalid state not detected

  • Related Vehicle Control History (RoB): X2079
  • Related DTC: U010087

Master Cylinder Pressure Sensor Power Supply Open

Master cylinder pressure sensor power supply voltage status

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: C054049

Solenoid Power Supply Open

Solenoid power supply voltage status

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: C143A7F

Motor Power Supply Open

Motor power supply voltage status

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: C052F14

Stop Switch Open

Momentary interruption (open circuit) status in wire harness between skid control ECU (brake actuator assembly) and stop light switch assembly status

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

Related DTC: C13807E, C13807F, P057113

Air Bag ECU Communication Open

Airbag sensor assembly open detection

Under intermittent or Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

  • Related Vehicle Control History (RoB): X2086
  • Related DTC: U015187

(f) Select the line graph display.

(g) Using the line graph, check whether the status is "Under intermittent" or "Normal".

OK:

Normal is displayed.

HINT:

If the display changes, this indicates that there has been a momentary interruption (open circuit) in the connector and/or wire harness. In this case, repair or replace the connectors and/or wire harnesses as one of them is faulty.

(h) While observing the screen, gently jiggle the connector or wire harness between the ECU and each sensors, or between ECUs.

OK:

Normal is displayed.

HINT:

  • If a momentary interruption occurs and Under intermittent is displayed on the Techstream, Under intermittent will remain displayed on the Techstream for 1 second after the circuit returns to normal.
  • If the display changes, this indicates that there has been a momentary interruption (open circuit) in the connector and/or wire harness. In this case, repair or replace the connectors and/or wire harnesses as one of them is faulty.
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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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