P0606

3MZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0606: ECM / PCM Processor

DTC P0606 - ECM / PCM Processor

DESCRIPTION

The ECM (HV control ECU) continuously monitors its internal processors (CPUs), A/F sensor transistors and heated oxygen sensor (HO2S) transistors. This self-check ensures that the ECM is functioning properly. These are diagnosed by internal "mirroring" of the main and sub CPUs to detect 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 (Included in HV control ECU) may interpret this as an HO2S transistor malfunction.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FOR EXHAUST GAS LEAK
(a) Allow the engine to idle.
(b) Check for exhaust gas leaks around the heated oxygen sensor.
OK:
No leak from the heated oxygen sensor.
NG -- REPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT
OK -- Continue to next step.
2. CHECK HEATED OXYGEN SENSOR





(a) Connect Techstream to the DLC3.
(b) Put the engine in inspection mode.
(c) Start the engine and turn the tester on.
(d) Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
(e) Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
(f) Perform the Control the Injection Volume for A/F Sensor operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
(g) Monitor the voltage outputs of the HO2 sensors (O2S B1S2) displayed on the tester.
HINT:
- The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
- Each sensor reacts in accordance with increases in the fuel injection volume.

Standard voltage:






NG -- REPLACE HEATED OXYGEN SENSOR
OK -- Continue to next step.
3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0606)





(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position and turn the tester on.
(c) Clear the DTCs DTC Check / Clear.
(d) Turn the ignition switch off and turn the tester off.
(e) Disconnect the battery negative terminal and wait for 1 minute.
(f) Connect the battery negative terminal.
(g) Start the engine.
(h) Perform the drive pattern.
(1) Warm up the engine.
(2) Accelerate the vehicle to 50 mph (80 km/h) and stop the vehicle.
(3) Drive the vehicle at 35 to 50 mph (60 to 80 km/h) for 5 minutes or more.
(i) Turn the tester on.
(j) Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
(k) Read the DTCs.
Result:






B -- CHECK FOR INTERMITTENT PROBLEMS
A -- REPLACE HV CONTROL ECU