Toyota Tundra. Manual — part 1255

To check the air pump operation, use the Air Injection Check function described in the System
Check.

NG : REPLACE AIR PUMP ASSEMBLY . (See AIR PUMP ).

Fig. 220: Identifying Air Pump Connector Terminals

OK : Go to next step.

8. INSPECT AIR INJECTION CONTROL DRIVER (AIR INJECTION CONTROL DRIVER

POWER SOURCE CIRCUIT) (See INSPECTION PROCEDURE )

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 D51 or D55 AID connector.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Tester Connection

Condition Specified Condition

D74-54 (AIRP) - D55-4 (SIP)

Always

Below 1 ohms

D74-53 (ARP2) - D51-4 (SIP2) Always

Below 1 ohms

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

Fig. 221: Identifying D74 ECM Connector & D51 Or D55 Aid Connector

OK : Go to next step.

10. REPLACE AIR INJECTION CONTROL DRIVER

a. Replace the air injection control driver. (See AIR INJECTION DRIVER ).

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

INSPECTION PROCEDURE )

NG : REPLACE ECM (See REMOVAL )

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

OK : END

DTC P2610 ECM/PCM INTERNAL ENGINE OFF TIMER PERFORMANCE

DTC SUMMARY

DTC SUMMARY 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. 222: ECM/PCM Internal Engine Off Timer Performance - Circuit 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

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 (1GR-FE) - Tundra

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

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 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.

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

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra