Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

CHECK OPERATION OF TACHOMETER
1. Run the engine and check if the function of the tachometer in the combination meter is normal.
  OK:
  
  Actual engine revolution speed and the revolution indicated on the tachometer are the same.
NG: GO TO COMBINATION METER SYSTEM

OK: Go to Next Step
CHECK DTC OUTPUT (MULTIPLEX NETWORK COMMUNICATION SYSTEM (BEAN))
1. Delete the DTC (See DIAGNOSIS SYSTEM ).
2. Check for the multiplex network communication system DTCs B1210, B1214 and B1215.
  HINT:
  
  If the DTCs for the multiplex network communication system malfunction are output, inspect those DTCs first (See HOW TO PROCEED WITH TROUBLESHOOTING ).
  
  OK:
  
  No DTC is output.
NG: GO TO MULTIPLEX COMMUNICATION SYSTEM

OK: Go to Next Step
CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM)
1. Delete the DTC (See DIAGNOSIS SYSTEM ).
2. Check for the CAN communication system DTC U0146.
  HINT:
  
  If the DTCs for the CAN communication system malfunction are output, inspect those DTCs first (See HOW TO PROCEED WITH TROUBLESHOOTING ).
  
  OK:
  
  No DTC is output.
NG: GO TO CAN COMMUNICATION SYSTEM

OK: Go to Next Step
CHECK CONNECTORS
1. Check that the connectors are securely connected and the terminals are not deformed or loose.
  OK:
  
  The connectors are securely connected and the terminals are not deformed or loose.
NG: REPAIR OR REPLACE CONNECTORS

OK: Go to Next Step

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND)

Disconnect the ECU connector.

Measure the resistance according to the value (s) in the table below.

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection (Symbols)	Condition	Specified Condition
J55-6 (GND2) - Body ground	Always	Below 1 Ω

Fig 1: Identifying Terminal GND2 Of J55 Power Source Control ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - ECM)

Disconnect the A6 ECM connector.

Measure the resistance according to the value (s) in the table below.

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection (Symbols)	Condition	Specified Condition
J55-2 (TACH) - A6-16 (TACH)	Always	Below 1 Ω
J55-2 (TACH) or A6-16 (TACH) - Body ground	Always	10 kΩ or higher

HINT:

If the result of the inspection for a short circuit is not as specified, there may be a short in the ECU.

Fig 2: Identifying A6 ECM And J55 Power Source Control ECU Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS, CONNECTOR OR EACH ECU

OK: Go to Next Step

READ VALUE OF TECHSTREAM

Reconnect the connectors.
Connect Techstream to the DLC3.
Turn the engine switch on (IG).

Check the DATA LIST for proper functioning of the engine running.

Body:

TESTER DISPLAY REFERENCE

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Engine Condition	Engine condition/ STOP or RUN	STOP: Engine is stopped RUN: Engine is running	-

OK:

STOP (engine is stopped) and RUN (engine is running) appear on the screen.

NG: REPLACE ECM

OK: Go to Next Step

RECHECK FOR DTC
1. Delete the DTCs (See DIAGNOSIS SYSTEM ).
2. Check for DTCs again.
  OK:
  
  DTC B2286 is not output.
NG: REPLACE POWER SOURCE CONTROL ECU

OK: CHECK INTERMITTENT PROBLEMS