Toyota Tundra. Manual — part 1399

The ECM continuously monitors its main and sub CPUs. This self-check ensures that the ECM is functioning
properly. If outputs from the CPUs are different and deviate from the standard, the ECM will illuminate the
MIL and set a DTC immediately.

DTC DETECTION CONDITION AND TROUBLE AREA

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

INSPECTION PROCEDURE

1. CHECK DTC

a. Clear DTC. (See DTC CHECK/CLEAR ).

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. Turn the ignition switch to ON.

f. Check DTC.

OK: P0606 is not present.

DTC Code

DTC Detection Condition

Trouble Area

P0606

When either condition below is met:



ECM main CPU error



ECM sub CPU error

ECM

Related DTC

P0606: ECM range check

Required sensors/Components (main)

ECM

Required sensors/Components (sub)

-

Frequency of Operation

Continuous

Duration

16 seconds

MIL Operation

Immediate

Sequence of Operation

None

Monitor runs whenever the following DTCs are not present

None

CPU reset

Occurred

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

NG : REPLACE ECM (See REMOVAL )

OK : CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT
PROBLEMS )

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 set a DTC immediately.

DTC DETECTION CONDITION AND TROUBLE AREA

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

DTC Code

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

NOTE:

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

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

Estimated A/F sensor temperature

450 to 800°C (842 to 1472°F)

Estimated HO2S temperature

450 to 800°C (842 to 1472°F)

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

INSPECTION 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 : Go to Next Step

2. CHECK HEATED OXYGEN SENSOR

Fig. 188: Fuel Trim Rear HO2S Voltage Graph

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

A/F sensor transistors

Fail

HO2S transistors

Fail

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

FUEL-TRIM REFERENCE

NG : REPLACE HEATED OXYGEN SENSOR (See REMOVAL )

OK : Go to Next Step

3. CHECK DTC

a. Clear DTC. (See DTC CHECK/CLEAR ).

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.

Fig. 189: Engine Coolant Temperature Graph

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.

NG : REPLACE ECM (See REMOVAL )

OK : CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT
PROBLEMS )

DTC P060A INTERNAL CONTROL MODULE MONITORING PROCESSOR PERFORMANCE

A/F CONTROL O2S B1S2 (O2S B2S2)

-12.5%

Less than 0.2 V

25%

More than 0.8 V

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra