Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Rough Idling (P160500)

HINT:

• DTC P160500
  • In contrast to conventional DTCs for components, circuits and systems, DTC P160500 is used to estimate the malfunctioning area from problem symptoms and freeze frame data in response to symptoms such as "rough idling", "strong engine vibrations", etc.

    Such problem symptoms can occur even in the following conditions:

    • Driving with long-stored fuel (fuel that has remained in the tank for long periods of time)
    • Using fuel not acclimated to the climate during a change of seasons
    • Temporarily using low-quality fuel (fuel that contains water or has poor fuel properties)
  • As DTCs may be stored when an Active Test or learning is performed, make sure to clear the DTCs before returning the vehicle to the customer.
  • If any other DTCs are output, perform troubleshooting for those DTCs first.
• FREEZE FRAME DATA
  • Read freeze frame data using the Techstream. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.
  • When confirming the freeze frame data, be sure to check all multi freeze frame data.

    Click here

  • When confirming the freeze frame data, if there are multiple items related to the cause of the malfunction, perform troubleshooting for all related items.
  • Try to operate the vehicle under the conditions recorded in the freeze frame data which were present when the malfunction occurred. Confirm the data at this time and the data when the engine is idling (engine warmed up, no load, and shift lever in D or N) and compare this data with the freeze frame data.
• PRECAUTIONS
  • Inspections take into account the fact that the malfunction may not have recurred and place emphasis on checking the vehicle conditions present at the time when the malfunction occurred.
  • When performing inspections, jiggle the relevant wire harnesses and connectors in an attempt to reproduce malfunctions that do not always occur.

HINT:

• If any DTCs other than P160500 are output, troubleshoot those DTCs first.
• Using freeze frame data, confirm the conditions the moment the DTC was stored and after the DTC was stored. This information can be useful when troubleshooting.

HINT:

• At first, the Techstream displays extremely high cylinder engine speed values. After approximately 10 seconds of engine cranking, each cylinder engine speed measurement will change to the actual engine speed.
• If the cylinder engine speed values (Engine Speed Cylinder #1 to #6) displayed in the Data List do not change from an extremely high value, return to the Active Test menu screen, change "Check the Cylinder Compression" to "Start" and crank the engine again within 1 second.

NOTICE:

• Do not crank the engine continuously for 20 seconds or more.
• If it is necessary to crank the engine again after Check the Cylinder Compression has been changed to "Start" and the engine has been cranked once, press Exit to return to the Active Test menu screen. Then change Check the Cylinder Compression to "Start" and crank the engine.
• Use a fully-charged battery.

NOTICE:

• If the Active Test is changed to "Stop" while the engine is being cranked, the engine will start.
• When performing the Active Test, DTC P160400 (Startability Malfunction) may be stored.
• After performing the Active Test, make sure to check and clear DTCs.

HINT:

• If the value of Data List item "Engine Speed Cylinder #1 to #6" of a cylinder is higher than other cylinders, the cylinder may be malfunctioning.
• If the value of Data List item "Engine Speed Cylinder #1 to #6" is high for only one cylinder, compression loss is suspected.

Startability Malfunction (P160400)

DESCRIPTION This DTC is stored when the engine does not start even though the STA signal is input or when the engine takes a long time to start, and when the engine speed is low or the engine stalls j ...

Cruise Control Input Processor (P160700)

MONITOR DESCRIPTION The ECM continuously monitors its main and sub CPUs. This self-check ensures that the ECM is functioning properly. If outputs from the CPUs are different and deviate from the stand ...

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