P0606

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

DTC P0606 - ECM / PCM Processor

MONITOR DESCRIPTION

The ECM continuously monitors its internal processors (CPUs), A/F sensor transistors and heated oxygen sensor (HO2S) 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.





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





INSPECTION PROCEDURE

HINT: Read freeze frame data using the Techstream. Freeze frame data record 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.

PROCEDURE

1. CHECK FOR EXHAUST GAS LEAK
(a) Allow the engine to idle.
(b) Check for exhaust gas leak around the HO2S.
OK:
No leak from the HO2S.
NG -- REPAIR LEAK
OK -- Continue to next step.
2. CHECK HEATED OXYGEN SENSOR
(a) Warm up the engine.





(b) Allow the engine to idle.
(c) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
(d) Check the O2S B1 S2 (O2S B2 S2) values when the Control the Injection Volume for A/F Sensor is -12.5% (Lean fuel-trim).
(e) Check the O2S B1 S2 (O2S B2 S2) values when the Control the Injection Volume for A/F Sensor is 25% (Rich fuel-trim).
Standard:





NG -- REPLACE HEATED OXYGEN SENSOR
OK -- Continue to next step.
3. CHECK DTC
(a) Clear DTC.
(b) Turn the ignition switch OFF.
(c) Disconnect the battery negative terminal and wait for 1 minute.
(d) Connect the battery negative terminal.
(e) Start the engine.





(f) Perform the drive pattern.
(1) Warm up the engine.
(2) Accelerate the vehicle until 80 km/h (50 mph) and stop the vehicle.
(3) Drive the vehicle by 60 to 80 km/h (35 to 50 mph) for 5 minutes or more.
(g) Check DTC.
OK:
P0606 is not present.
NG -- REPLACE ECM
OK -- CHECK FOR INTERMITTENT PROBLEMS