Toyota Tundra. Manual — part 1397

TYPICAL MALFUNCTION THRESHOLDS

P0550:

TYPICAL MALFUNCTION THRESHOLDS - P0550

P0552:

TYPICAL MALFUNCTION THRESHOLDS - P0552

P0553:

TYPICAL MALFUNCTION THRESHOLDS - P0553

INSPECTION PROCEDURE

HINT:



If other DTCs relating to different systems that have terminal E2 as the ground terminal are output
simultaneously, terminal E2 may have an open circuit.



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. CHECK HARNESS AND CONNECTOR (ECM - POWER STEERING OIL PRESSURE

SENSOR)

a. Disconnect the D74 ECM connector.

b. Disconnect the D46 power steering oil pressure sensor connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Power steering pressure sensor voltage

Less than 0.28 V, or higher than 4.9 V

Power steering pressure sensor voltage

Less than 0.28 V

Power steering pressure sensor voltage

Higher than 4.9 V

Tester Connection

Condition Specified Condition

D46-2 (PSP) - D74-72 (PSP)

Always

Below 1 ohms

D46-1 (VC) - D74-66 (VC)

Always

Below 1 ohms

D46-3 (E2) - D74-97 (ETHW)

Always

Below 1 ohms

D46-2 (PSP) or D74-72 (PSP) - Body ground Always

10 kohms or higher

D46-1 (VC) or D74-66 (VC) - Body ground

Always

10 kohms or higher

2008 Toyota Tundra

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

Fig. 184: Identifying D74 ECM & D46 Power Steering Oil Pressure Sensor Connector

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : Go To Next Step

2. REPLACE POWER STEERING OIL PRESSURE SENSOR

a. Replace the power steering oil pressure sensor.

3. CONFIRM WHETHER DTC OUTPUT RECURS

a. Connect the Techstream to the DLC3.

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

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

d. Read the DTCs.

Result

RESULT REFERENCE

Result

Proceed To

P0550, P0552 and/or P0553 are output

A

No DTC is output

B

2008 Toyota Tundra

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

B : END

A : REPLACE ECM (See REMOVAL )

DTC P0560 SYSTEM VOLTAGE

DESCRIPTION

The battery supplies electricity to the ECM even when the ignition switch is in the OFF position. This power
allows the ECM to store data such as DTC history, freeze frame data and fuel trim values. If the battery voltage
falls below a minimum level, the memory is cleared and the ECM determines that there is a malfunction in the
power supply circuit. When the engine is next started, the ECM illuminates the MIL and sets the DTC.

DTC DETECTION CONDITION AND TROUBLE AREA

HINT:

If DTC P0560 is set, the ECM does not store other DTCs or the data stored in the ECM is partly erased.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

DTC

Code

DTC Detection Condition

Trouble Area

P0560

Open in ECM back up power source circuit (1 trip
detection logic)



Open in back up power source
circuit Battery



Battery



terminals



EFI MAIN fuse



ECM

Related DTCs

P0560: ECM system voltage

Required Sensors/Components (Main)

ECM

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

3 seconds

MIL Operation

Immediate (MIL illuminated after next engine start)

Sequence of Operation

None

Monitor runs whenever following DTCs not present

None

2008 Toyota Tundra

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

TYPICAL MALFUNCTION THRESHOLDS

WIRING DIAGRAM

Fig. 185: System Voltage - Wiring Diagram

INSPECTION PROCEDURE

HINT:

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. INSPECT FUSE (EFI NO. 1)

a. Remove the EFI NO. 1 fuse from the engine room relay block.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

ECM power source

Less than 3.5 V

Tester Connection Condition Specified Condition

EFI NO. 1 fuse

Always

Below 1 ohms

2008 Toyota Tundra

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