Last Modified: 4-30-2014 6.6 C Doc ID: RM000002I3S037X
Model Year: 2006 Model: LX470 Prod Date Range: [05/2005 -           ]
Title: 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0606; ECM / PCM Processor; 2006 MY LX470 [05/2005 -        ]

DTC

P0606

ECM / PCM Processor

DESCRIPTION

The ECM continuously monitors its internal processors (CPUs), heated oxygen sensor (HO2S) transistors. This self-check ensures that the ECM is functioning properly. This is diagnosed by internal "mirroring" of the main and sub CPUs to detect processor errors. If outputs from the processors deviate from the standard, the ECM will illuminate the MIL and set a DTC immediately.

DTC No.

DTC Detection Condition

Trouble Area

P0606
  • ECM CPUs malfunction
  • HO2S transistors malfunction
  • Exhaust gas leak
  • HO2S
  • ECM

NOTICE:

An exhaust gas leak generates noise in the HO2S output. The ECM may interpret this as an HO2S transistor malfunction and set P0606.

MONITOR STRATEGY

Related DTCs

None

Required sensors / components (Main)

ECM

Required sensors / components (Related)

APP sensor, TP sensor, Brake switch, Cruise control, HO2S

Frequency of operation

Continuous

Duration

60 seconds

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

Engine

Running

Estimated HO2S temperature

450 - 800°C (842 - 1472°F)

TYPICAL MALFUNCTION THRESHOLDS

Difference of main APP and sub APP

0.3 V or more

Difference of main TP and sub TP

0.3 V or more

Difference of main brake switch signal and sub brake switch signal

Different

HO2S transistors

Fail

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK ANY OTHER DTCS OUTPUT

(a) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.

(b) Turn the ignition switch to ON and turn the intelligent tester ON.

(c) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

(d) Read the DTCs 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: DTC CHECK / CLEAR .

Result

Result

Proceed to

P0606 and P0136, P0137, P0138, P0156, P0157 or P0158 are output

A

P0606 is output

B
B

GO TO STEP 3

A

2.

INSPECT DTC (P0136, P0137, P0138, P0156, P0157 OR P0158)

(a) Inspect the P0136, P0137, P0138, P0156, P0157 or P0158 flowchart.

HINT:

  • If P0136 or P0156 is output, troubleshoot for that DTC first 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0138,P0156-P0158; Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2) . Then proceed to "INSPECT ECM".
  • If P0137 or P0157 is output, troubleshoot for that DTC first 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0138,P0156-P0158; Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2) . Then proceed to "INSPECT ECM".
  • If P0138 or P0158 is output, troubleshoot for that DTC first 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0138,P0156-P0158; Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2) . Then proceed to "INSPECT ECM".
  • If DTC P0606 and P0136, P0137, P0138, P0156, P0157 or P0158 are output, the output voltage of the heated oxygen sensor may remain close to 0 V or become high (around 1 V or more).
NEXT

GO TO STEP 6

3.

CHECK FOR EXHAUST GAS LEAK

(a) Allow the engine to idle and rev the engine.

(b) Check for exhaust gas leaks around the heated oxygen sensor.

If any exhaust gas leaks are present, repair it and proceed to "PERFORM CONFIRMATION DRIVING PATTERN". If no exhaust gas leaks are present proceed to "PERFORM CONFIRMATION DRIVING PATTERN".

HINT:

  • If no exhaust gas leaks are present, a malfunction in the heated oxygen sensor circuit is suspected.
  • If any exhaust gas leaks are present around the heated oxygen sensor, noise appears in the output voltage of the heated oxygen sensor.
NEXT

4.

PERFORM CONFIRMATION DRIVING PATTERN

(a) Clear the DTC 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: DTC CHECK / CLEAR .

(b) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.

(c) Start the engine.

(d) Turn the intelligent tester ON.

(e) Warm up the engine until the engine coolant temperature becomes 75°C (167°F) or more.

(f) Perform the drive pattern.

(1) Accelerate the vehicle to 80 km/h (50 mph) and stop the vehicle.

(2) Drive the vehicle between 60 and 80 km/h (35 and 50 mph) for 5 minutes.

(g) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

(h) Read the DTCs.

Result

Result

Proceed to

P0606 and P0136, P0137, P0138, P0156, P0157 or P0158 are output

A

Only P0606

B

No DTC output

C
B

REPLACE ECM

C

GO TO STEP 6

A

5.

INSPECT DTC (P0136, P0137, P0138, P0156, P0157 OR P0158)

(a) Inspect the P0136, P0137, P0138, P0156, P0157 or P0158 flowchart.

HINT:

  • If P0136 or P0156 is output, troubleshoot for that DTC first 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0138,P0156-P0158; Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2) . Then proceed to "INSPECT ECM".
  • If P0137 or P0157 is output, troubleshoot for that DTC first 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0138,P0156-P0158; Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2) . Then proceed to "INSPECT ECM".
  • If P0138 or P0158 is output, troubleshoot for that DTC first 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0138,P0156-P0158; Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2) . Then proceed to "INSPECT ECM".
  • If DTC P0606 and P0136, P0137, P0138, P0156, P0157 or P0158 are output, the output voltage of the heated oxygen sensor may remain close to 0 V or become high (around 1 V or more).
NEXT

6.

INSPECT ECM

(a) Clear the DTC 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: DTC CHECK / CLEAR .

(b) Stop the engine and wait for 30 minutes.

(c) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.

(d) Start the engine and allow it to idle for 2 minutes.

(e) Turn the Techstream on.

(f) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

(g) Check the DTCs.

Result

Result

Proceed to

DTC is not output

A

P0606 is output

B
B

REPLACE ECM

A

END