P0606

1GR-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. This self-check ensures that the ECM functioning properly. These are diagnosed by internal "mirroring" of the main and sub CPUs to detect the processors error. If outputs from the processors deviate from the standards, the ECM will illuminate the MIL and set a DTC immediately.





NOTE: 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 a 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 ETC / Trouble Codes.
(e) Read DTCs.
Result:






B -- CHECK FOR EXHAUST GAS LEAK
A -- Continue to next step.
2. INSPECT DTC (P0136, P0137, P0138, P0156, P0157 or P0158)

- If P0136 or P0156 is out put, troubleshoot for that DTC first P0136. Then proceed to step 6.
- If P0137 or P0157 is out put, troubleshoot for that DTC first P0136. Then proceed to step 6.
- If P0138 or P0158 is out put, troubleshoot for that DTC first P0136. Then proceed to step 6.
HINT: If 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 -- Continue to next step.
3. CHECK FOR EXHAUST GAS LEAK
(a) Allow the engine to idle and rev the engine.
(b) Check for exhaust gas leak 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 DTCs DTC Check / Clear.
(b) Connect the Techstream to the DLC3.
(c) Warm up the engine until the engine coolant temperature becomes 75 °C (167 °F) or more.
(d) Perform the driving pattern.
(1) Accelerate the vehicle until 80 km/h (50 mph) and stop the vehicle.
(2) Drive the vehicle by 60 to 80 km/h (35 to 50 mph) for 5 minutes or more.
(e) Select the following menu items: Powertrain / Engine and ETC / Trouble Codes.
(f) Read DTCs.
Result:






C -- INSPECT ECM
B -- REPLACE ECM
A -- Continue to next step.
5. INSPECT DTC (P0136, P0137, P0138, P0156, P0157 or P0158)
(a) Inspect the P0136, P0137, P0138, P0156, P0157 or P0158 flow chart.
HINT:
- If P0136 or P0156 is out put, troubleshoot for that DTC first P0136. Then proceed to step 6.
- If P0137 or P0157 is out put, troubleshoot for that DTC first P0136. Then proceed to step 6.
- If P0138 or P0158 is out put, troubleshoot for that DTC first P0136. Then proceed to step 6.
- If 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 -- Continue to next step.
6. INSPECT ECM
(a) Clear DTCs 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 ETC / Trouble Codes.
(g) Read DTCs.
Result:






B -- END
A -- REPLACE ECM