Toyota Tundra. Manual — part 1624

Fig. 253: Identifying D48 And D50 Or D52 And D54 AID Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Measure the resistance according to the value (s) in the table below.

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

c. Turn the ignition switch to ON.

d. Measure the voltage according to the value (s) in the table below.

Standard voltage

VOLTAGE SPECIFIED CONDITION

NG: REPAIR OR REPLACE AIR INJECTION CONTROL DRIVER POWER SOURCE
CIRCUIT

OK: Go to Next Step

9. CHECK HARNESS AND CONNECTOR (ECM - AIR INJECTION CONTROL DRIVER)

a. Disconnect the D74 ECM connector.

b. Disconnect the D50 or D54 AID connector.

Tester Connection

Condition Specified Condition

D50-1 (E) - Body ground

Always

Below 1 ohms

D54-1 (E2) - Body ground Always

Below 1 ohms

Tester Connection

Switch Condition

Specified Condition

D48-1 (BATT) - Body ground

Always

11 to 14 V (near battery voltage)

D50-5 (+B) - Body ground Ignition switch ON 11 to 14 V (near battery voltage)

D52-1 (BAT2) - Body ground

Always

11 to 14 V (near battery voltage)

D54-5 (+B2) - Body ground Ignition switch ON 11 to 14 V (near battery voltage)

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Saturday, June 19, 2010 7:34:46 PM

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Fig. 254: Identifying D74 ECM With D50 Or D54 AID Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

c. Measure the resistance according to the value (s) in the table below.

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

10. REPLACE AIR INJECTION CONTROL DRIVER

a. Replace the air injection control driver (see REMOVAL ).

11. CHECK WHETHER DTC OUTPUT RECURS (DTC P2444, P2445, P2446 AND/OR P2447)

a. Start the engine and warm it up.

b. Turn the ignition switch off.

c. Connect the Techstream to the DLC3.

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

e. Clear DTCs (if output) (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.

Tester Connection

Condition Specified Condition

D74-54 (AIRP) - D50-4 (SIP)

Always

Below 1 ohms

D74-53 (ARP2) - D54-4 (SIP2) Always

Below 1 ohms

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Saturday, June 19, 2010 7:34:46 PM

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© 2006 Mitchell Repair Information Company, LLC.

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 CHART

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.

Fig. 255: ECM - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

MONITOR DESCRIPTION

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

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

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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
stores the DTC (2 trip detection logic).

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS

INSPECTION PROCEDURE

HINT:



DTC P2610 is stored 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.

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 more

Starter

OFF

Soak timer measurement when ECM CPU clock counts 10
minutes

Less than 7 minutes, or more than 13
minutes

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Saturday, June 19, 2010 7:34:46 PM

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© 2006 Mitchell Repair Information Company, LLC.