How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2007 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Use the following procedures to troubleshoot the cruise control system.
*: Use the intelligent tester.

VEHICLE BROUGHT TO WORKSHOP
PROBLEM SYMPTOM CONFIRMATION

CHECK MULTIPLEX COMMUNICATION SYSTEM*

Refer to HOW TO PROCEED WITH TROUBLESHOOTING .

Check for output DTCs.

Result

RESULT TABLE

Result	Proceed to
MPX DTC is not output	A
MPX DTC is output	B

HINT:

The ECM of this system is connected to the multiplex communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the multiplex communication system.

B: PROCEED TO MULTIPLEX COMMUNICATION SYSTEM

A: Go to Next Step

CHECK CAN COMMUNICATION SYSTEM*

Refer to PRECAUTION .

Check for output DTCs.

Result

RESULT TABLE

Result	Proceed to
CAN DTC is not output	A
CAN DTC is output	B

HINT:

The ECM of this system is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system.

B: PROCEED TO CAN COMMUNICATION SYSTEM

A: Go to Next Step

DTC CHECK AND CLEAR*
Refer to DTC CHECK/CLEAR .

DTC CHECK (OTHER THAN MPX AND CAN SYSTEM DTC)*

Result

RESULT TABLE

Result	Proceed to
DTC is not output	A
DTC is output	B

A: GO TO STEP 8

B: Go to Next Step

DTC TABLE
Refer to DIAGNOSTIC TROUBLE CODE TABLE .

GO TO STEP 11

PROBLEM SYMPTOM CONFIRMATION

Result

RESULT TABLE

Result	Proceed to
Symptom occurs	A
Symptom does not occur	B

A: GO TO STEP 10

B: Go to Next Step

SYMPTOM SIMULATION
Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

Go to step 8
PROBLEM SYMPTOMS TABLE
Refer to PROBLEM SYMPTOMS TABLE .
CIRCUIT INSPECTION
TERMINALS OF ECM
Refer to TERMINALS OF ECM .
IDENTIFICATION OF PROBLEM
REPAIR OR REPLACE
CONFIRMATION TEST
NEXT: END