1.CHECK OPERATION OF METER BUZZER
1. Select BUZZER of BCM(BUZZER) on CONSULT.
2. Perform LIGHT WARN ALM of Active Test.
Does meter buzzer beep?
YES >> Inspection End.
NO >> GO TO 2.
2.CHECK COMBINATION METER INPUT SIGNAL
Select the DATA MONITOR for the METER/MA and check the BUZZER monitor value.
BUZZER
Under the condition of buzzer input : On
Except above : Off
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI "Removal and Installation" (Type A) or MWI "Removal and Installation" (Type B).
NO >> Replace BCM. Refer to BCS "Removal and Installation" (with Intelligent Key) or BCS "Removal and Installation" (without Intelligent Key).
Regarding Wiring Diagram information, refer to WCS "Wiring Diagram".
1.CHECK POWER SUPPLY OF COMBINATION METER
Check power supply of combination meter. Refer to MWI "COMBINATION METER : Diagnosis Procedure" or MWI "COMBINATION METER : Diagnosis Procedure".
NOTE: To identify combination meter type, refer to MWI "Information".
Is the inspection result normal?
YES >> Inspection End.
NO >> Repair power supply circuit of combination meter.
Electric ignition system
ELECTRIC IGNITION SYSTEM : System Diagram
ELECTRIC IGNITION SYSTEM : System Description
INPUT/OUTPUT SIGNAL CHART
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Engine speed*3
Piston position
Ignition timing control
Igni ...
U0073 Communication bus a off
DTC Logic
DTC
Trouble diagnosis name
DTC detecting condition
Possible causes
U0073
Control Module Communication
Bus "A" Off
When the ignition switch is ON,
TCM detects a bus-off error
continuously for 2 seconds or
more.
Harness or connector
(CA ...