Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 75

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–255

ES

NG

(a) Disconnect the A3 stop light switch connector.
(b) Disconnect the E47 ECM connector.
(c) Check the resistance.

Standard Resistance (Check for open)

Standard Resistance (Check for short)

(d) Reconnect the stop light switch connector.
(e) Reconnect the ECM connector.

NG

OK

4

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM)

A3

Front View

ECM Connector

Wire Harness Side:

Stop Light Switch Connector

E47

ST1-

STP

A116299E03

Tester Connections

Specified Conditions

Stop light switch (A3-1) - STP (E47-15)

Below 1 

Ω

Stop light switch (A3-4) - ST1- (E47-16)

Tester Connections

Specified Conditions

Stop light switch (A3-1) or STP (E47-15) - Body 

ground

10 k

Ω or higher

Stop light switch (A3-4) or ST1- (E47-16) - Body 

ground

REPAIR OR REPLACE HARNESS OR 
CONNECTOR

REPLACE ECM (See page 

ES-446

)

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1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

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 Position (TP) sensor, which detects the opening angle of the throttle valve; 4) the Accelerator 
Pedal Position (APP) sensor, which detects the accelerator pedal position; and 5) the ECM, which 
controls the ETCS. Based on the target idling speed, the ECM controls the throttle actuator to provide the 
proper throttle valve opening angle.

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 apply:
•

The learned idling air flow volume remains at the maximum or minimum volume 5 times or more during 
a drive cycle.

•

While driving at 6.25 mph (10 km/h) or more, the actual engine idling speed varies from the target idling 
speed by between 100 rpm and 200 rpm, 5 times or more during a drive cycle.

Example:

If the actual idling speed varies from the target idling speed by more than 200 rpm

*

 5 times during a drive 

cycle, the ECM illuminates the MIL and sets the DTC.

*

: Threshold idling speed varies with engine load.

DTC

P0505

Idle Control System Malfunction

DTC No.

DTC Detection Conditions

Trouble Areas

P0505

Idling speed continues to vary greatly from target idling speed 
(2 trip detection logic)

•

ETCS

•

Air induction system

•

PCV hose connection

•

ECM

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

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ES

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

Functional check:

TYPICAL MALFUNCTION THRESHOLDS

Functional check:

Related DTCs

P0505: ISC Function

Required Sensors/Components (Main)

ETCS

Required Sensors/Components (Related)

Crankshaft position sensor, Engine coolant temperature sensor, and Vehicle speed sensor

Frequency of Operation

Continuous

Duration

10 minutes

MIL Operation

2 driving cycles

Sequence of Operation

None

Monitor runs whenever following DTCs not present

None

Engine

Running

Either of following conditions 1 or 2 met

-

1. Frequency that following conditions (a) and (b) met

5 times or more

(a) Engine RPM - target engine RPM (A/C OFF and NSW OFF)

Below -100 rpm, or 150 rpm or more

(b) Vehicle condition

Stop after vehicle was driven by 6.25 mph (10 km/h) or more

2. Frequency that following conditions (c) and (d) met

Once

(c) Engine RPM - target engine RPM (A/C OFF and NSW OFF)

Below -100 rpm, or 150 rpm or more

(d) ISC airflow rate (learning value)

1.3 L/sec. or less, or 8.5 L/sec. or more

Time

Time

Small

Minimum

Maximum

0

Large

Idle Speed Learned Valve

Example

Idle Speed

Target RPM

Actual Idle RPM

A121611E01

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1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

INSPECTION PROCEDURE

HINT:
•

The following conditions may also cause DTC P0505 to be set:

(1) The floor carpet overlapping slightly onto the accelerator pedal, causing the accelerator pedal to 
be slightly depressed and therefore the throttle valve position to be slightly open.
(2) The accelerator pedal being not fully released.

•

Read freeze frame data using an intelligent tester. Freeze frame data record 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.

(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the tester ON.
(d) Select the following menu items: DIAGNOSIS / 

ENHANCED OBD II / DTC INFO / CURRENT CODES.

(e) Read DTCs.

Result

HINT:
If any DTCs other than P0505 are output, troubleshoot 
those DTCs first.

B

A

OK:

PCV hose is connected correctly and is not damaged.

NG

OK

(a) Check the air induction system for vacuum leakage.

OK:

No leakage from air induction system.

NG

OK

1

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505)

Display (DTC Output)

Proceed To

P0505

A

P0505 and other DTCs

B

GO TO DTC CHART (See page 

ES-57

)

2

CHECK PCV HOSE CONNECTIONS

REPAIR OR REPLACE PCV HOSE

3

CHECK AIR INDUCTION SYSTEM

REPAIR OR REPLACE AIR INDUCTION 
SYSTEM