How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Use these procedures to troubleshoot the dynamic radar cruise control system.
The intelligent tester should be used at steps 3, 4, 5, and 9.

VEHICLE BROUGHT TO WORKSHOP
NEXT
INSPECT BATTERY VOLTAGE
Standard:

11 to 14 V

If the voltage is below 11 V, replace or recharge the battery before proceeding.

NEXT

CHECK COMMUNICATION FUNCTION OF MULTIPLEX COMMUNICATION SYSTEM (BEAN)

Use the intelligent tester to check if the Multiplex Communication System (MPX) is functioning normally.

Result

DTC RESULT REFERENCE

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

B : Go to MULTIPLEX COMMUNICATION

A : GO TO NEXT STEP

CHECK COMMUNICATION FUNCTION OF CONTROLLER AREA NETWORK (CAN)

Use the intelligent tester to check for normal function of CAN communication system.

Perform bus check (communication malfunction DTC).
Perform bus check (communication bus check).

Result

DTC RESULT REFERENCE

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

B : Go TO CAN COMMUNICATION SYSTEM

A : GO TO NEXT STEP

CHECK FOR DTC

Refer to DTC CHECK / CLEAR .

Check for DTC and note any codes that are output.
Delete the DTC.

Recheck for DTC. Try to prompt the DTC by simulating the original activity that the DTC suggests.

Result

DTC RESULT REFERENCE

Result	Proceed to
DTC does not reoccur	A
DTC reoccur	B

B : Go to step 8

A : GO TO NEXT STEP

PROBLEM SYMPTOMS TABLE

Refer to PROBLEM SYMPTOMS TABLE .

Result

DTC RESULT REFERENCE

Result	Proceed to
Fault is not listed in problem symptoms table	A
Fault is listed in problem symptoms table	B

B : Go to step 8

A : GO TO NEXT STEP

OVERALL ANALYSIS AND TROUBLESHOOTING
1. TERMINALS OF ECU
2. DATA LIST / ACTIVE TEST
NEXT
REPAIR OR REPLACE
NEXT
CONFIRMATION TEST
NEXT : END