P0606

4GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0606: ECM / PCM Processor

DTC P0606 - ECM / PCM Processor

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.





NOTE: First check for an exhaust gas leak around the HO2S if P0606 is present. An exhaust gas leak generates noise in the HO2S output. The ECM may interpret this an HO2S transistor malfunction and set P0606.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





INSPECTION PROCEDURE

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 DTC Check / Clear.
(b) Turn the engine 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 50 mph (80 km/h) and stop the vehicle.
(3) Drive the vehicle by 35 to 50 mph (60 to 80 km/h) for 5 minutes or more.
(g) Check DTC.
OK:
P0606 is not present.
NG -- REPLACE ECM
OK -- CHECK FOR INTERMITTENT PROBLEMS