Inspection Procedure

HINT:

Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1. CHECK ANY OTHER DTCS OUTPUT 
   1. Connect the Techstream to the DLC3.
   2. Turn the engine switch to ON.
   3. Turn the Techstream on.
   4. Enter the following menu: Powertrain/Engine and ECT/Trouble Codes.
   5. Read the DTC (See DTC CHECK/CLEAR ).

   Result 

   RESULT REFERENCE
   
   

   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: Go to Next Step 

2. INSPECT DTC (P0136, P0137, P0138, P0156, P0157 OR P0158) 
   1. Inspect the P0136, P0137, P0138, P0156, P0157 or P0158 flowchart.

      HINT: 

      • If P0136 or P0156 is output, troubleshoot for that DTC first (See DTC P0136 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2); DTC P0137 OXYGEN SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2); DTC P0138 OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2); DTC P0156 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 2 SENSOR 2); DTC P0157 OXYGEN SENSOR CIRCUIT LOW VOLTAGE (BANK 2 SENSOR 2); DTC P0158 OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 2 SENSOR 2) ). Then proceed to "INSPECT ECM".
      • If P0137 or P0157 is output, troubleshoot for that DTC first (See DTC P0136 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2); DTC P0137 OXYGEN SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2); DTC P0138 OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2); DTC P0156 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 2 SENSOR 2); DTC P0157 OXYGEN SENSOR CIRCUIT LOW VOLTAGE (BANK 2 SENSOR 2); DTC P0158 OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 2 SENSOR 2) ). Then proceed to "INSPECT ECM".
      • If P0138 or P0158 is output, troubleshoot for that DTC first (See DTC P0136 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2); DTC P0137 OXYGEN SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2); DTC P0138 OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2); DTC P0156 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 2 SENSOR 2); DTC P0157 OXYGEN SENSOR CIRCUIT LOW VOLTAGE (BANK 2 SENSOR 2); DTC P0158 OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 2 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 
   1. Allow the engine to idle and rev the engine.
   2. Check for exhaust gas leaks around the heated oxygen sensor.

      If any exhaust gas leaks are present, repair it and proceed to  4"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.
4. PERFORM CONFIRMATION DRIVING PATTERN 
   Fig 1: Confirmation Driving Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Clear DTC (See DTC CHECK/CLEAR ).
   2. Connect the Techstream to the DLC3.
   3. Start the engine.
   4. Warm up the engine until the engine coolant temperature becomes 75°C (167°F) or more.
   5. 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.
   6. Enter the following menu: Powertrain/Engine and ECT/Trouble Codes.
   7. Read the DTCs.

   Result 

   RESULT REFERENCE
   
   

   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  (See REMOVAL )

   C:  Go to step  6

   A: Go to Next Step 

5. INSPECT DTC (P0136, P0137, P0138, P0156, P0157 OR P0158) 
   1. Inspect the P0136, P0137, P0138, P0156, P0157 or P0158 flowchart.

   HINT: 

   • If P0136 or P0156 is output, troubleshoot for that DTC first (See DTC P0136 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2); DTC P0137 OXYGEN SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2); DTC P0138 OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2); DTC P0156 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 2 SENSOR 2); DTC P0157 OXYGEN SENSOR CIRCUIT LOW VOLTAGE (BANK 2 SENSOR 2); DTC P0158 OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 2 SENSOR 2) ). Then proceed to  6 "INSPECT ECM".
   • If P0137 or P0157 is output, troubleshoot for that DTC first (See DTC P0136 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2); DTC P0137 OXYGEN SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2); DTC P0138 OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2); DTC P0156 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 2 SENSOR 2); DTC P0157 OXYGEN SENSOR CIRCUIT LOW VOLTAGE (BANK 2 SENSOR 2); DTC P0158 OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 2 SENSOR 2) ). Then proceed to  6 "INSPECT ECM".
   • If P0138 or P0158 is output, troubleshoot for that DTC first (See DTC P0136 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2); DTC P0137 OXYGEN SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2); DTC P0138 OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2); DTC P0156 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 2 SENSOR 2); DTC P0157 OXYGEN SENSOR CIRCUIT LOW VOLTAGE (BANK 2 SENSOR 2); DTC P0158 OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 2 SENSOR 2) ). Then proceed to  6 "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).
6. INSPECT ECM 
   1. Clear DTC (See DTC CHECK/CLEAR ).
   2. Stop the engine and wait for 30 minutes.
   3. Connect the Techstream to the DLC3.
   4. Start the engine and allow it to idle for 2 minutes.
   5. Turn the Techstream on.
   6. Enter the following menu: Powertrain/Engine and ECT/Trouble Codes.
   7. Check the DTCs.

Result 

B: REPLACE ECM  (See REMOVAL )

A: END