Inspection Procedure
WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
HINT.
If "+B of GND short malfunction of communication bus" DTCs (B1266 and B1267) are detected at the same time as "communication stop" DTC B1205, repair the "+B or GND short malfunction of communication bus" DTCs first (See DTC B1266 SHORT TO B+ IN INSTRUMENT PANEL SYSTEM COMMUNICATION BUS MALFUNCTION; DTC B1267 SHORT TO GND IN INSTRUMENT PANEL SYSTEM COMMUNICATION BUS MALFUNCTION ).
- INSPECT FUSE (H-LP LVL)
- Remove the H-LP LVL fuse from the main body ECU LH (cowl side junction block LH)
- Measure the resistance according to the value(s) in the table below
Standard Resistance
RESISTANCE REFERENCETester Connection Condition Specified Condition H-LP LVL fuse Always Below 1 Ω
NG: REPLACE FUSE (H-LP LVL)
OK: Go to Next Step
- CHECK HARNESS AND CONNECTOR (AFS ECU - BATTERY AND BODY GROUND)
- Disconnect the A27 connector.
- Turn the engine switch on (IG)
- Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage
VOLTAGE SPECIFICATIONTester Connection Condition Specified Condition A27-2 (IG) - Body ground Engine switch on (IG) 11 to 14 V Standard Resistance
RESISTANCE REFERENCETester Connection Condition Specified Condition A27-1 (E1) - Body ground Always Below 1 Ω
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (AFS ECU - BATTERY AND BODY GROUND)
OK: Go to Next Step
- CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)
- Disconnect the A27, J58 and J34 connectors.
- Measure the resistance according to the value(s) in the table below
Standard Resistance
RESISTANCE REFERENCETester Connection Condition Specified Condition A27-5 (MPX1) - J58-31 (MPX-) Always Below 1 Ω A27-6 (MPX2) - J34-6 (MPX+) Always Below 1 Ω
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AFS ECU (See AFS ECU )