DTC P0606-49: Control Module Processor Internal Electronic Failure [09/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.

READ OUTPUT DTC (DTC P0606-49)

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
P0606-49 and other DTCs are output	A
P0606-49 is output	B

HINT:

If any DTCs other than P0606-49 are output, troubleshoot those DTCs first.

Result:

GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2023 - ]

Result:

See step 2

READ OUTPUT VEHICLE CONTROL HISTORY

Read the Vehicle Control History.

Powertrain > Engine > Utility

Tester Display
Vehicle Control History (RoB)

Result

Result	Proceed to
Vehicle Control History is output	A
Vehicle Control History is not output	B

Result:

GO TO VEHICLE CONTROL HISTORY (RoB)

Result:

See step 3

READ FREEZE FRAME DATA (FUEL TRIM)

Using the GTS, check "Short FT B1S1 and Long FT B1S1" in the Freeze Frame Data.

Powertrain > Engine > DTC(P0606-49) > Freeze Frame Data

Tester Display
Short FT B1S1
Long FT B1S1

Result

Result	Proceed to
The sum of the value of Short FT B1S1 and Long FT B1S1 is -20 % or more, and less than 20 %	A
None of the above conditions are met	B

Result:

See step 12

Result:

See step 4

READ FREEZE FRAME DATA (THROTTLE AIR FLOW LEARN VALUE)

Using the GTS, check "Throttle Air Flow Learn Value (Area 1), Throttle Air Flow Learn Value (Area 2) and Throttle Air Flow Learn Value (Area 3)" in the Freeze Frame Data.

Powertrain > Engine > DTC(P0606-49) > Freeze Frame Data

Tester Display
Throttle Air Flow Learn Value (Area 1)
Throttle Air Flow Learn Value (Area 2)
Throttle Air Flow Learn Value (Area 3)

Result

Result	Proceed to
The value of Throttle Air Flow Learn Value (Area 1), Throttle Air Flow Learn Value (Area 2) and Throttle Air Flow Learn Value (Area 3) is 0.75 to 1.2	A
None of the above conditions are met	B

HINT:

Perform "Inspection After Repair" after cleaning the throttle body with motor assembly.

Refer to INITIALIZATION [09/2023 - ]

Result:

REMOVE FOREIGN MATTER AND CLEAN THROTTLE BODY WITH MOTOR ASSEMBLY

Result:

See step 5

CHECK INTAKE SYSTEM

Check the intake system for vacuum leaks.

Refer to ON-VEHICLE INSPECTION [09/2023 - ]

No leaks in the intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system.

Refer to INITIALIZATION [09/2023 - ]

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE INTAKE SYSTEM

Result:

See step 6

CHECK FOR EXHAUST GAS LEAK

Check for exhaust gas leaks.

No gas leaks in exhaust system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the exhaust system.

Refer to INITIALIZATION [09/2023 - ]

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE EXHAUST SYSTEM

Result:

See step 7

CLEAR DTC

Pre-procedure1

None

Clear the DTCs.

Powertrain > Engine > Clear DTCs

Result

Proceed to
NEXT

Post-procedure1

Turn the ignition switch off and wait for at least 30 seconds.

Result:

See step 8

CHECK WHETHER DTC OUTPUT RECURS (DTC P0606-49)

Pre-procedure1

Drive the vehicle in accordance with the driving pattern of the following system described in Confirmation Driving Pattern.
HINT:
- VVT system
  Refer to DTC P0011-00: Camshaft Position "A" - Timing Over-Advanced or System Performance Bank 1; DTC P0012-00: Camshaft Position "A" - Timing Over-Retarded Bank 1 [09/2023 - ]
- Turbocharger System
  Refer to DTC P0234-00: Turbocharger/Supercharger "A" Overboost Condition [09/2023 - ]

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
P0606-49 and other DTCs are output	A
P0606-49 is output	B
DTCs are not output	C

HINT:

If any DTCs other than P0606-49 are output, troubleshoot those DTCs first.

Post-procedure1

None

Result:

GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2023 - ]

Result:

See step 9

Result:

See step 9

READ OUTPUT VEHICLE CONTROL HISTORY

Read the Vehicle Control History.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
Vehicle Control History is output	A
Vehicle Control History is not output	B

Result:

GO TO VEHICLE CONTROL HISTORY (RoB)

Result:

See step 10

CLEAR DTC

Pre-procedure1

None

Clear the DTCs.

Powertrain > Engine > Clear DTCs

Result

Proceed to
NEXT

Post-procedure1

Turn the ignition switch off and wait for at least 30 seconds.

Result:

See step 11

PERFORM CONFIRMATION DRIVING PATTERN

Read the Data List when the ignition switch is ON (engine stopped).

Powertrain > Engine > Data List

Tester Display
Atmospheric Pressure
Intake Manifold Absolute Pressure
Boost Pressure Sensor

Result

Result	Proceed to
The difference between the Boost Pressure Sensor and the Atmospheric Pressure is more than 10 kPa, and the difference between the Boost Pressure Sensor and the Intake Manifold Absolute Pressure is more than 10 kPa	A
The difference between the Atmospheric Pressure and the Boost Pressure Sensor is more than 10 kPa, and the difference between the Atmospheric Pressure and the Intake Manifold Absolute Pressure is more than 10 kPa	B
None of the above conditions are met	C

Result:

REPLACE NO. 2 TURBO PRESSURE SENSOR. Refer to REMOVAL [09/2023 - ]

Result:

REPLACE ATMOSPHERIC PRESSURE SENSOR (ECM). Refer to REMOVAL [09/2023 - ]

Result:

See step 16

CHECK INTAKE SYSTEM

Check the intake system for vacuum leaks.

Refer to ON-VEHICLE INSPECTION [09/2023 - ]

No leaks in the intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system.

Refer to INITIALIZATION [09/2023 - ]

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE INTAKE SYSTEM

Result:

See step 13

INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

Inspect the mass air flow meter sub-assembly, referring to On-vehicle Inspection for Mass Air Flow Meter.
Refer to ON-VEHICLE INSPECTION [09/2023 - ]

Inspect the mass air flow meter sub-assembly, referring to Inspection for Mass Air Flow Meter.

Refer to INSPECTION [09/2023 - ]

Result

Proceed to
OK
NG

Result:

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to REMOVAL [09/2023 - ]

Result:

See step 14

PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION MODE)

Refer to PROCEDURE - Step 2

Result

Item		Proceed to
Port	Direct	Proceed to
OK	OK	A
OK	NG	B
NG	OK	C
NG	NG	D

Result:

See step 18

Result:

See step 26

Result:

See step 27

Result:

See step 15

CHECK IF VEHICLE HAS RUN OUT OF FUEL IN PAST

Refer to PROCEDURE - Step 3

Result

Result	Proceed to
YES	A
NO	B

Result:

DTC CAUSED BY RUNNING OUT OF FUEL

Result:

CHECK FOR INTERMITTENT PROBLEMS. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ]

PERFORM CONFIRMATION DRIVING PATTERN

Pre-procedure1

Push the GTS snapshot button to turn the snapshot function on.
HINT:

Using the snapshot function, data can be recorded during the Confirmation Driving Pattern.
Drive the vehicle in accordance with the driving pattern for P0606-49 described in Confirmation Driving Pattern.

Read the Data List when the Confirmation Driving Pattern is performed.

Result

Result	Proceed to
The value of Total FT Bank 1 is more than 0.2, and less than -0.2.	A
None of the above conditions are met	B

Post-procedure1

None

Result:

See step 21

Result:

See step 17

CHECK PCV VALVE AND HOSE CONNECTIONS

except Mexico Models

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

for Mexico Models

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the PCV hose connections.

Check the PCV valve.

Refer to INSPECTION [09/2023 - ]

PCV hose and PCV valve are connected correctly and are not damaged.

Result

Proceed to
OK
NG

Result:

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to REMOVAL [09/2023 - ]

Result:

REPAIR OR REPLACE PCV VALVE OR HOSE

READ VALUE USING GTS (FUEL PRESSURE (HIGH))

Refer to PROCEDURE - Step 4

Result

Result	Proceed to
The value of Fuel Pressure (High) is between 2000 and 32000 kPag	A
None of the above conditions are met	B

Result:

See step 22

Result:

See step 19

PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION MODE (DIRECT))

Refer to PROCEDURE - Step 5

Result

Item			Proceed to
Injection Mode	High Pressure Fuel Pump Duty Ratio (D4)	Total of Short FT B1S1 and Long FT B1S1	Proceed to
Direct	10% to 50%	-	A
	50% or higher	-20% or less	B
	10% or less	+20% or higher	B
	50% or higher	+20% or higher	C
	10% or less	-20% or less	D

Result:

REPLACE FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE). Refer to REMOVAL [09/2023 - ]

Result:

See step 23

Result:

REPLACE ECM. Refer to REMOVAL [09/2023 - ]

Result:

See step 20

PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION MODE (DIRECT))

Refer to PROCEDURE - Step 6

Result

Item			Proceed to
Injection Mode	High Pressure Fuel Pump Duty Ratio (D4)	Total of Short FT B1S1 and Long FT B1S1	Proceed to
Direct	10 to 50%	-25% or less	A
	10 to 50%	+25% or higher	A
	10 to 50%	-25 to +25%	B

Result:

REPLACE DIRECT FUEL INJECTOR ASSEMBLY. Refer to REMOVAL [09/2023 - ]

Result:

CHECK FOR INTERMITTENT PROBLEMS. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ]

PERFORM CONFIRMATION DRIVING PATTERN

Pre-procedure1

Perform Learning Value Reset.

Powertrain > Engine > Utility

Tester Display
Learning Value Reset

Perform Idle Learning.
HINT:

Refer to INITIALIZATION [09/2023 - ]

Read the Data List.

Powertrain > Engine > Data List

Tester Display
Throttle Air Flow Learn Value (Area 1)
Throttle Air Flow Learn Value (Area 2)
Throttle Air Flow Learn Value (Area 3)

Compare Throttle Air Flow Learn Value (Area 1), Throttle Air Flow Learn Value (Area 2) and Throttle Air Flow Learn Value (Area 3) stored in the Freeze Frame Data with Throttle Air Flow Learn Value (Area 1), Throttle Air Flow Learn Value (Area 2) and Throttle Air Flow Learn Value (Area 3) after idle learning is performed.

Result

Result	Proceed to
The difference between the Freeze Frame Data value and value after idle learning is performed is from -0.05 to 0.05	A
None of the above conditions are met	B

Post-procedure1

None

Result:

REPLACE ECM. Refer to REMOVAL [09/2023 - ]

Result:

REMOVE FOREIGN MATTER AND CLEAN THROTTLE BODY WITH MOTOR ASSEMBLY

CHECK MISFIRE COUNT OF DIRECT INJECTION

Refer to PROCEDURE - Step 7

Result

Injection Mode	Misfire Count	Proceed to
Direct	No misfire counts, or misfire counts occur randomly in all cylinders	A
Direct	Misfire counts occur in particular cylinder	B

Result:

REPLACE DIRECT FUEL INJECTOR ASSEMBLY. Refer to REMOVAL [09/2023 - ]

Result:

See step 23

REPLACE FUEL (ENGINE ROOM SIDE) PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE)
Refer to PROCEDURE - Step 8

Result

Proceed to

NEXT

Result:

NEXT

See step 24

CLEAR DTC

Pre-procedure1

None

Clear the DTCs.

Powertrain > Engine > Clear DTCs

Result

Proceed to
NEXT

Post-procedure1

Turn the ignition switch off and wait for at least 30 seconds.

Result:

See step 25

CONFIRM WHETHER DTC OUTPUT RECURS (DTC P0606-49)

Pre-procedure1

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
DTCs are not output	A
P0606-49 is output	B

Post-procedure1

None

Result:

END

Result:

REPLACE ECM. Refer to REMOVAL [09/2023 - ]

INSPECT PORT FUEL INJECTOR ASSEMBLY
Refer to PROCEDURE - Step 11

Result

Proceed to

OK

NG

Result:

OK

REPLACE ECM. Refer to REMOVAL [09/2023 - ]

Result:

NG

REPLACE PORT FUEL INJECTOR ASSEMBLY. Refer to REMOVAL [09/2023 - ]
INSPECT PURGE VSV
Refer to PROCEDURE - Step 12

Result

Proceed to

OK

NG

Result:

NG

REPLACE PURGE VSV. Refer to REMOVAL [09/2023 - ]

Result:

OK

See step 28
CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)
Refer to PROCEDURE - Step 13

Result

Proceed to

OK

NG

Result:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

OK

See step 29
CHECK PCV VALVE AND HOSE CONNECTIONS
Refer to PROCEDURE - Step 14

Result

Proceed to

OK

NG

Result:

NG

REPAIR OR REPLACE PCV VALVE OR HOSE

Result:

OK

See step 30
CHECK INTAKE SYSTEM
Refer to PROCEDURE - Step 15

Result

Proceed to

OK

NG

Result:

NG

REPAIR OR REPLACE INTAKE SYSTEM

Result:

OK

See step 31

PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

Refer to PROCEDURE - Step 16

Result

Status A/F (O2) Sensor Current B1S1	Status A/F (O2) Sensor Current B1S2	Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition	Suspected Trouble Area	Proceed to
Lean/Rich	Lean/Rich	Normal	-	A
Lean	Lean	Actual air fuel ratio lean	PCV valve and hose PCV hose connections Gas leak from exhaust system Intake system Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor
Rich	Rich	Actual air fuel ratio rich	Gas leak from exhaust system Ignition system Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor
Lean	Lean/Rich	Air fuel ratio sensor (sensor 1) malfunction	Air fuel ratio sensor (sensor 1)	B
Rich	Lean/Rich	Air fuel ratio sensor (sensor 1) malfunction	Air fuel ratio sensor (sensor 1)	B

Result:

See step 39

Result:

See step 32

READ VALUE USING GTS (COOLANT TEMPERATURE SENSOR1, COOLANT TEMPERATURE SENSOR2)

Refer to PROCEDURE - Step 17

Result

Result	Proceed to
OK	A
NG (Coolant Temperature Sensor1)	B
NG (Coolant Temperature Sensor2)	C

Result:

REPLACE ENGINE COOLANT TEMPERATURE SENSOR (FOR OUTLET SIDE). Refer to REMOVAL [09/2023 - ]

Result:

REPLACE ENGINE COOLANT TEMPERATURE SENSOR (FOR CYLINDER HEAD SIDE). Refer to REMOVAL [09/2023 - ]

Result:

See step 33

READ VALUE USING GTS (MASS AIR FLOW SENSOR)

Refer to PROCEDURE - Step 18

Result

Result	Proceed to
The value of Mass Air Flow Sensor is between 5 and 15 gm/sec	A
None of the above conditions are met	B

Result:

See step 46

Result:

See step 34

CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE)
Refer to PROCEDURE - Step 19

Result

Proceed to

OK

NG

Result:

NG

See step 38

Result:

OK

See step 35
CHECK FOR EXHAUST GAS LEAK
Refer to PROCEDURE - Step 20

Result

Proceed to

OK

NG

Result:

NG

REPAIR OR REPLACE EXHAUST SYSTEM

Result:

OK

See step 36
INSPECT SPARK PLUG
Refer to PROCEDURE - Step 21

Result

Proceed to

OK

NG

Result:

NG

REPLACE SPARK PLUG. Refer to REMOVAL [09/2023 - ]

Result:

OK

See step 37
CHECK FOR SPARK (SPARK TEST)
Refer to PROCEDURE - Step 22

Result

Proceed to

NEXT

Result:

NEXT

See step 46
CHECK FUEL LINE
Refer to PROCEDURE - Step 23

Result

Proceed to

OK

NG

Result:

OK

GO TO FUEL PUMP CONTROL CIRCUIT. Refer to Fuel Pump Control Circuit [09/2023 - ]

Result:

NG

REPAIR OR REPLACE FUEL SYSTEM
INSPECT AIR FUEL RATIO SENSOR (SENSOR 1) (HEATER RESISTANCE)
Refer to PROCEDURE - Step 24

Result

Proceed to

OK

NG

Result:

NG

REPLACE AIR FUEL RATIO SENSOR (SENSOR 1). Refer to REMOVAL [09/2023 - ]

Result:

OK

See step 40
CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR (SENSOR 1))
Refer to PROCEDURE - Step 25

Result

Proceed to

OK

NG

Result:

NG

See step 49

Result:

OK

See step 41
CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (SENSOR 1) - ECM)
Refer to PROCEDURE - Step 26

Result

Proceed to

OK

NG

Result:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

OK

See step 42
REPLACE AIR FUEL RATIO SENSOR (SENSOR 1)
Refer to PROCEDURE - Step 27

Result

Proceed to

NEXT

Result:

NEXT

See step 43

CLEAR DTC

Pre-procedure1

None

Clear the DTCs.

Powertrain > Engine > Clear DTCs

Result

Proceed to
NEXT

Post-procedure1

Turn the ignition switch off and wait for at least 30 seconds.

Result:

See step 44

CONFIRM WHETHER DTC OUTPUT RECURS (DTC P0606-49)

Pre-procedure1

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
DTCs are not output	A
P0606-49 is output	B

Post-procedure1

None

Result:

END

Result:

See step 45

READ VALUE USING GTS (MASS AIR FLOW SENSOR)
Refer to PROCEDURE - Step 30

Result

Proceed to

NEXT

Result:

NEXT

See step 46
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)
Refer to PROCEDURE - Step 31

Result

Proceed to

NEXT

Result:

NEXT

See step 47

CLEAR DTC

Pre-procedure1

None

Clear the DTCs.

Powertrain > Engine > Clear DTCs

Result

Proceed to
NEXT

Post-procedure1

Turn the ignition switch off and wait for at least 30 seconds.

Result:

See step 48

CHECK WHETHER DTC OUTPUT RECURS (DTC P0606-49)

Pre-procedure1

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
DTCs are not output	A
P0606-49 is output	B

Post-procedure1

None

Result:

END

Result:

See step 53

INSPECT EFI-MAIN NO. 3 RELAY
Refer to PROCEDURE - Step 34

Result

Proceed to

OK

NG

Result:

NG

REPLACE EFI-MAIN NO. 3 RELAY

Result:

OK

See step 50
CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 3 RELAY)
Refer to PROCEDURE - Step 35

Result

Proceed to

OK

NG

Result:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO. 3 RELAY)

Result:

OK

See step 51
CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - BODY GROUND)
Refer to PROCEDURE - Step 36

Result

Proceed to

OK

NG

Result:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

OK

See step 52
CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - AIR FUEL RATIO SENSOR (SENSOR 1))
Refer to PROCEDURE - Step 37

Result

Proceed to

OK

NG

Result:

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 3 RELAY)

Result:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)
Refer to PROCEDURE - Step 38

Result

Proceed to

OK

NG

Result:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

OK

See step 54
INSPECT MASS AIR FLOW METER SUB-ASSEMBLY
Refer to PROCEDURE - Step 39

Result

Proceed to

NEXT

Result:

NEXT

See step 55

CLEAR DTC

Pre-procedure1

None

Clear the DTCs.

Powertrain > Engine > Clear DTCs

Result

Proceed to
NEXT

Post-procedure1

Turn the ignition switch off and wait for at least 30 seconds.

Result:

See step 56

CONFIRM WHETHER DTC OUTPUT RECURS (DTC P0606-49)

Pre-procedure1

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
DTCs are not output	A
P0606-49 is output	B

Post-procedure1

None

Result:

END

Result:

REPLACE ECM. Refer to REMOVAL [09/2023 - ]