Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Cruise Control Input Processor (P160700)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Engine & Hybrid System / Cruise Control / Dynamic Radar Cruise Control System / Cruise Control Input Processor (P160700)

DESCRIPTION

When the ECM detects that it is not functioning normally, DTC P160700 is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

P160700

Cruise Control Input Processor

When the engine switch is on (IG) and control of vehicle speed by the dynamic radar cruise control system is prohibited by the sub-CPU, the dynamic radar cruise control system operates for 0.3 seconds or more.

ECM

Comes on

Cruise Control

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 standard, illuminate the MIL and store the DTC immediately.

MONITOR STRATEGY

Related DTCs

P1607: Internal control module performance

Required Sensors/Components (Main)

ECM

Required Sensors/Components (Related)

Cruise control

Frequency of Operation

Continuous

Duration

0.3 seconds

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

All of the following conditions are met

-

Cruise control

Forbiddance

DMA communication error

Not detected

TYPICAL MALFUNCTION THRESHOLDS

Cruise control

Operating

CONFIRMATION DRIVING PATTERN

HINT:

When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the engine switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the Techstream off.
  5. Turn the engine switch off.
  6. Disconnect the Techstream.
  7. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.
  8. Connect the cable to the negative (-) battery terminal.
  9. Connect the Techstream to the DLC3.
  10. Turn the engine switch on (IG) and turn the Techstream on.
  11. Turn the cruise control main switch on.
  12. Wait 16 seconds or more.[*1]

    HINT:

    [*1] : Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  13. Enter the following menus: Powertrain / Radar Cruise 1 / Trouble Codes.
  14. Read the DTCs.

    HINT:

    • If a DTC is output, the system is malfunctioning.
    • If a DTC is not output, perform the following procedure.
  15. If the DTCs are not output, perform a universal trip and check for permanent DTCs.

    Click here

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTCs are output, the system is normal.

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the ECM, refer to Registration.

Click here

HINT:

Read the freeze frame data using the Techstream. When a malfunction is detected, various engine control parameters are stored as freeze frame data and can be useful for troubleshooting.

PROCEDURE

1.

CHECK FOR DTCs

(a) Clear the DTCs.

Powertrain > Cruise Control > Clear DTCs

(b) Make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

(c) Check for DTCs.

Powertrain > Cruise Control > Trouble Codes

Result

Proceed to

DTC P160700 is not output

A

DTC P160700 is output

B
A

USE SIMULATION METHOD TO CHECK

B

REPLACE ECM

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