Toyota Tundra (2015 year). Manual — part 1944

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.
STP signal conditions can be checked using the Techstream.

Connect the Techstream to the DLC3.

a.

Turn the ignition switch to ON.

b.

Turn the Techstream on.

c.

Enter the following menus: Powertrain / Engine and ECT / All Data / Stop Light Switch.

d.

Check the STP signal when the brake pedal is depressed and released.

e.

BRAKE PEDAL OPERATION

SPECIFIED CONDITION

Depressed

STP signal ON

Released

STP signal OFF

PROCEDURE

1.

CHECK STOP LIGHT SWITCH ASSEMBLY (B+ VOLTAGE)

3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0504; Brake...

OK

OK

(a) Disconnect the A4 stop light switch connector.

(b) Measure the voltage according to the value(s) in the

table below.

Standard voltage:

TESTER

CONNECTION

SWITCH

CONDITION

SPECIFIED

CONDITION

A4-2 - Body ground

Always

11 to 14 V

A4-4 - Body ground

Ignition switch ON

11 to 14 V

NG

GO TO STEP 4

2.

INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Remove the stop light switch

.

(b) Measure the resistance according to the value(s) in the

table below.

Standard resistance:

TESTER

CONNECTION

SWITCH

CONDITION

SPECIFIED

CONDITION

1 - 2

Pin not pushed

Below 1 Ω

Pin pushed

10 kΩ or higher

3 - 4

Pin not pushed

10 kΩ or higher

Pin pushed

Below 1 Ω

NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

3.

CHECK ECM (STP AND ST1 - VOLTAGE)

3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0504; Brake...

(a) Disconnect the A24 ECM connector.

(b) Turn the ignition switch to ON.

(c) Measure the voltage according to the value(s) in the

table below.

Standard voltage:

TESTER CONNECTION

CONDITION

SPECIFIED

CONDITION

A24-35 (ST1-) - Body

ground

Brake pedal

released

11 to 14 V

Brake pedal

depressed

0 to 3 V

A24-36 (STP) - Body

ground

Brake pedal

released

0 to 3 V

Brake pedal

depressed

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

REPLACE ECM

4.

INSPECT FUSE (STOP AND IGN)

(a) Remove the STOP and IGN fuses from the engine room

relay block.

(b) Measure the resistance according to the value(s) in the

table below.

Standard resistance:

TESTER CONNECTION

CONDITION

SPECIFIED CONDITION

STOP fuse

Always

Below 1 Ω

IGN fuse

Always

Below 1 Ω

NG

CHECK FOR SHORTS IN ALL HARNESSES AND

CONNECTORS CONNECTED TO FUSE AND

REPLACE FUSE

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR

(ECM - STOP LIGHT SWITCH)

3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0504; Brake...

Last Modified: 9-16-2014

6.6 C

Doc ID: RM000000T8M0T2X

Model Year: 2015

Model: Tundra

Prod Date Range: [08/2014 - ]

Title: 3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0505; Idle Control System Malfunction; 2015 MY

Tundra [08/2014 - ]

DTC

P0505

Idle Control System Malfunction

DESCRIPTION

The idling speed is controlled by the ETCS (Electronic Throttle Control System). The ETCS is comprised of: 1)

the one valve type throttle body; 2) the throttle actuator, which operates the throttle valve; 3) the Throttle

the target idling speed, the ECM controls the throttle actuator to provide the proper throttle valve opening

angle.

DTC

CODE

DTC DETECTION CONDITION

TROUBLE AREA

P0505

Idling speed continues to vary greatly from target idling speed (2

trip detection logic)

ETCS

Air induction

system

PCV hose

connections

ECM

MONITOR DESCRIPTION

The ECM monitors the idling speed and idling air flow volume to conduct Idle Speed Control (ISC). The ECM

determines that the ISC system is malfunctioning if the following conditions are met:

The difference between the target engine idling speed and actual engine idling speed exceeds the

threshold and the IAC flow rate learned value is stuck at the upper or lower limit for 5 seconds or

more.

then the system determines that the IAC flow rate learned value is stuck at the upper or lower

limit, or that the IAC flow rate learned value has been changed by an amount that exceeds the

threshold.

3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0505; Idle Co...