Last Modified: 11-29-2007 1.6 C
Service Category: Engine/Hybrid System Section: Engine Control
Model Year: 2008 Model: Sequoia Doc ID: RM000002I3S01WX
Title: 3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 Sequoia)

DTC

P0607

Control Module Performance

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 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 standard, the ECM will illuminate the MIL and store a DTC immediately.

DTC No.

DTC Detection Condition

Trouble Area

P0607

When one of following conditions is met:

  • ECM CPUs malfunction
  • A/F sensor transistors malfunction
  • HO2S transistors malfunction
  • Exhaust gas leak
  • HO2S
  • ECM

NOTICE:

An exhaust gas leak generates noise in the HO2S output. The ECM may interpret this as an HO2S transistor malfunction and store P0607.

MONITOR STRATEGY

Related DTCs

None

Required sensors/Components (main)

ECM

Required sensors/Components (sub)

A/F sensor, HO2S

Frequency of operation

Continuous

Duration

60 seconds

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

Estimated A/F sensor temperature

450 to 800°C (842 to 1472°F)

Estimated HO2S temperature

450 to 800°C (842 to 1472°F)

TYPICAL MALFUNCTION THRESHOLDS

A/F sensor transistors

Fail

HO2S transistors

Fail

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.

OK

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 B1S2 (O2S B2S2) values when the Control the Injection Volume for A/F Sensor is -12.5% (Lean fuel-trim).

(e) Check the O2S B1S2 (O2S B2S2) values when the Control the Injection Volume for A/F Sensor is 25% (Rich fuel-trim).

Standard Voltage:

Control the Injection Volume

O2S B1S2 (O2S B2S2)

-12.5%

Less than 0.2 V

25%

More than 0.8 V
OK

3.

CHECK DTC

(a) Clear DTC 3UR-FE ENGINE CONTROL: SFI SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

(b) Turn the ignition switch off.

(c) Disconnect the cable from the negative battery terminal and wait for 1 minute.

(d) Connect the cable to the negative battery 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:

P0607 is not present.

OK