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), Air-Fuel Ratio (A/F) sensor transistors and 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 FOR EXHAUST GAS LEAK
(a) Allow the engine to idle.
(b) Check for an exhaust gas leak around the HO2 sensor.
OK:
No exhaust gas leak from the HO2 sensor.
NG -- REPAIR EXHAUST GAS LEAK POINT
OK -- Continue to next step.
2. INSPECT HEATED OXYGEN SENSOR





(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester ON.
(d) Start the engine and warm it up.
(e) Allow the engine to idle.
(f) Select the following menu items: Powertrain / Engine and ECT Active Test / Control the Injection Volume for A/F Sensor.
(g) Check the O2S B1S2 values when the Control the Injection Volume for A/F Sensor is -12.5% Lean fuel trim.
(h) Check the O2S B1S2 values when the Control the Injection Volume for A/F Sensor is 25% Rich fuel trim.
Standard voltage:






NG -- REPLACE HEATED OXYGEN SENSOR
OK -- Continue to next step.
3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0606)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester ON.
(d) Clear DTC DTC Check / Clear.
(e) Turn the ignition switch to OFF and turn the tester OFF.
(f) Disconnect the tester.
(g) Disconnect the cable from the battery negative (-) terminal and wait for 1 minute.
(h) Connect the cable to the battery negative (-) terminal.
(i) Connect the tester to the DLC3.
(j) Turn the ignition switch to ON.
(k) Turn the tester ON.
(l) Start the engine.





(m) 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 at 35 to 50 mph (60 to 80 km/h) for 5 minutes or more.
(n) Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
(o) Read DTCs.
Result:






B -- REPLACE ECM
A -- CHECK FOR INTERMITTENT PROBLEMS