P0606

2AZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0606: ECM / PCM Processor
P0606 - ECM / PCM Processor

DESCRIPTION

The ECM continuously monitors its internal processors (CPUs) and heated oxygen (HO2) sensor transistors. This self-check ensures that the ECM is functioning properly.





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





INSPECTION PROCEDURE

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(e) Read the DTCs.

Result:





B -- CHECK FOR EXHAUST GAS LEAK
A -- Continue to next step.

2. INSPECT DTC (P0136, P0137 OR P0138)

(a) Refer to the P0136, P0137 or P0138 flowchart.

HINT
- If P0136 is output, troubleshoot for that DTC first P0136. Then proceed to "INSPECT ECM".
- If P0137 is output, troubleshoot for that DTC first P0136. Then proceed to "INSPECT ECM".
- If P0138 is output, troubleshoot for that DTC first P0136. Then proceed to "INSPECT ECM".
- If DTC P0606 and P0136, P0137 or P0138 are output, the output voltage of the HO2 sensor may remain close to 0 V or become high (around 1 V or higher).
NEXT -- INSPECT ECM

3. CHECK FOR EXHAUST GAS LEAK

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

(b) Check for exhaust gas leaks around the HO2 sensor.

If any exhaust gas leaks are present, repair them 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 HO2 sensor circuit is suspected.
- If any exhaust gas leaks are present around the HO2 sensor, noise appears in the output voltage of the HO2 sensor.
NEXT -- Continue to next step.

4. PERFORM CONFIRMATION DRIVING PATTERN





(a) Clear the DTC DTC Check / Clear.

(b) Connect the Techstream to the DLC3.

(c) Start the engine.

(d) Warm up the engine until the engine coolant temperature is 75°C (167°F) or higher.

(e) Perform the driving pattern.

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

(2) Drive the vehicle between 35 and 50 mph (56 and 80 km/h) for 5 minutes.

(f) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(g) Read the DTCs.

Result:





C -- INSPECT ECM

B -- REPLACE ECM Removal
A -- Continue to next step.

5. INSPECT DTC (P0136, P0137 OR P0138)

(a) Refer to the P0136, P0137 or P0138 flowchart.

HINT
- If P0136 is output, troubleshoot for that DTC first P0136. Then proceed to "INSPECT ECM".
- If P0137 is output, troubleshoot for that DTC first P0136. Then proceed to "INSPECT ECM".
- If P0138 is output, troubleshoot for that DTC first P0136. Then proceed to "INSPECT ECM".
- If DTC P0606 and P0136, P0137 or P0138 are output, the output voltage of the HO2 sensor may remain close to 0 V or become high (around 1 V or higher).
NEXT -- Continue to next step.

6. INSPECT ECM

(a) Clear the DTC DTC Check / Clear.

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

(c) Connect the Techstream 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: Powertrain / Engine and ECT / Trouble Codes.

(g) Check the DTCs.

Result:





B -- REPLACE ECM Removal

A -- END