P0606

1NZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0606: ECM / PCM Processor

DTC P0606 - ECM / PCM Processor

DESCRIPTION

The ECM continuously monitors its internal processors (CPUs), Heated Oxygen (HO2) sensor transistors built into the ECM. 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 standards, the ECM will illuminate the MIL and set the DTC immediately.





NOTE: First check for an exhaust gas leak around the HO2 sensor if P0606 is present. An exhaust gas leak generates noise in the HO2 sensor output. The ECM may interpret this as an HO2 sensor transistor malfunction and set P0606.

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 tester ON.
(d) Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
(e) Read the DTCs.
Result:






B -- CHECK FOR EXHAUST GAS LEAK
A -- Continue to next step.
2. CHECK DTC (P0136, P0137 OR P0138)
(a) Check the P0136, P0137 or P0138 flow chart.
HINT:
- If P0136 is output, troubleshoot for that DTC first P0136. Then proceed to step 6.
- If P0137 is output, troubleshoot for that DTC first P0136. Then proceed to step 6.
- If P0138 is output, troubleshoot for that DTC first P0136. Then proceed to step 6.
- If DTC P0606 and P0136, P0137 or P0138 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 -- 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 heated oxygen sensor.
If any exhaust gas leaks are present, repair it and proceed to step 4. If no exhaust gas leaks are present, proceed to step 4.
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 -- Continue to next step.
4. PERFORM CONFIRMATION DRIVING PATTERN
(a) Clear the DTC DTC Check / Clear.
(b) Connect the Techstream to the DLC3.
(c) Warm up the engine until the engine coolant temperature becomes 75° (167°F) or more.
(d) Perform the driving pattern.





(1) Accelerate the vehicle until 50 mph (80 km/h) and stop the vehicle.
(2) Drive the vehicle by 35 to 50 mph (60 to 80 km/h) for 5 minutes or more.
(e) Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
(f) Read the DTCs.
Result:






C -- INSPECT ECM
B -- REPLACE ECM
A -- Continue to next step.
5. CHECK DTC (P0136, P0137 OR P0138)
(a) Check the P0136, P0137 or P0138 flow chart.
HINT:
- If P0136 is output, troubleshoot for that DTC first P0136. Then proceed to step 6.
- If P0137 is output, troubleshoot for that DTC first P0136. Then proceed to step 6.
- If P0138 is output, troubleshoot for that DTC first P0136. Then proceed to step 6.
- If DTC P0606 and P0136, P0137 or P0138 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 -- 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 tester ON.
(f) Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
(g) Read the DTCs.
Result:






B -- END
A -- REPLACE ECM