Toyota Tundra. Manual — part 1435

b. Turn the ignition switch off.

c. Connect the or Techstream to the DLC3.

d. Turn the ignition switch to ON and turn the Techstream ON.

e. Clear DTCs (if set). (See DTC CHECK/CLEAR ).

f. Enter the following menus: Powertrain/Engine and ECT/Utility/Air injection check/Automatic

Mode.

g. Start the engine after the Techstream initialization is finished.

h. Perform the System Check operation by pressing Next.

i. After operating the AIR system, perform the following to confirm the AIR system pending codes:

Press the Exit button.

j. Check pending DTCs.

k. Turn the ignition switch off.

OK: No pending DTC is output.

NG : REPLACE ECM (See REMOVAL )

OK : END

DTC P2610 ECM/PCM INTERNAL ENGINE OFF TIMER PERFORMANCE

DTC SUMMARY

DTC SUMMARY

DESCRIPTION

To ensure the accuracy of the EVAP (Evaporative Emission) monitor values, the soak timer, which is built into
the ECM, measures 5 hours (+/-15 minutes) from when the ignition switch is turned off, before the monitor is
run. This allows the fuel to cool down, which stabilizes the EVAP pressure. When 5 hours have elapsed, the
ECM turns on.

NOTE:



When performing the Air Injection Check operation after the
battery cable has been reconnected, wait for 7 minutes with the
ignition switch turned to ON or the engine running.



Turn the ignition switch off when the Air Injection Check
operation finishes.

DTC

Monitoring Item

Malfunction Detection

Condition

Trouble

Area

Detection

Timing

Detection

Logic

P2610

Soak timer (built into
ECM)

ECM internal malfunction

ECM

Engine running

2 trip

2008 Toyota Tundra

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

Fig. 241: ECM/PCM Internal Engine Off Timer Performance - System Diagram

MONITOR DESCRIPTION

5 hours after the ignition switch is turned off, the soak timer activates the ECM to begin the EVAP system
monitor. While the engine is running, the ECM monitors the synchronization of the soak timer and the CPU
clock. If these two are not synchronized, the ECM interprets this as a malfunction, illuminates the MIL and sets
the DTC (2 trip detection logic).

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

Required Sensors/Components

ECM

Frequency of Operation

Once per driving cycle

Duration

10 minutes

MIL Operation

2 driving cycles

Sequence of Operation

None

Monitor runs whenever following DTC not present

None

Ignition switch

ON

Engine

Running

Battery voltage

8 V or higher

2008 Toyota Tundra

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

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

INSPECTION PROCEDURE

HINT:



DTC P2610 is set if an internal ECM problem is detected. Diagnostic procedures are not required. ECM
replacement is necessary.



Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other
data from the time the malfunction occurred.

1. REPLACE ECM

a. Replace the ECM. (See REMOVAL ).

2. CHECK WHETHER DTC OUTPUT RECURS

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream ON.

d. Clear DTCs. (See DTC CHECK/CLEAR ).

e. Start the engine and wait for 10 minutes or more.

f. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes/Pending.

g. If no pending DTC is displayed, the repair has been successfully completed.

NEXT : END

DTC P2A00 A/F SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 1); DTC P2A03 A/F
SENSOR CIRCUIT SLOW RESPONSE (BANK 2 SENSOR 1)

DESCRIPTION

Refer to DTC P2195 .

DTC DETECTION CONDITION AND TROUBLE AREA

Starter

OFF

Soak timer measurement when ECM CPU clock counts 10
minutes

Less than 7 minutes, or more than 13
minutes

DTC

Code

DTC Detection Condition

Trouble Area



Open or short in A/F
sensor circuit (for bank

2008 Toyota Tundra

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

MONITOR DESCRIPTION

After the engine is warmed up, the ECM performs air-fuel ratio feedback control to maintain the air-fuel ratio at
the stoichiometric level. In addition, active A/F control is performed for approximately 10 seconds after the
preconditions are met in order to measure the A/F sensor response rate. During active A/F control, the ECM
forcibly increases and decreases the injection volume a certain amount, based on the stoichiometric air-fuel ratio
learned during normal air-fuel ratio control, and measures the A/F sensor response rate. The ECM receives a
signal from the A/F sensor while performing active A/F control and uses it to calculate the A/F sensor response
rate deterioration level.

If the A/F sensor response rate deterioration level is less than the threshold, the ECM interprets this as a
malfunction and sets the DTC.

Fig. 242: Air-Fuel Ratio Sensor Output Graph

CONFIRMATION DRIVING PATTERN

HINT:

Performing this confirmation pattern will activate the A/F sensor response monitor.

P2A00

Calculated value of air-fuel ratio (A/F) sensor response rate
deterioration level less than threshold (2 trip detection logic)

1)



A/F sensor (for bank 1)



ECM

P2A03

Calculated value of air-fuel ratio (A/F) sensor response rate
deterioration level less than threshold (2 trip detection logic)



Open or short in A/F
sensor circuit (for bank
2)



A/F sensor (for bank 2)



ECM

2008 Toyota Tundra

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