Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 41

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–119

DESCRIPTION

Refer to DTC P0115 (See page

MONITOR DESCRIPTION

ECT sensor cold start monitor
When a cold engine start is performed and then the engine is warmed up, if the ECT sensor value does
not change, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving
cycles, the MIL is illuminated and a DTC is set.
ECT sensor soak monitor
After a warmed up engine is started, if the ECT sensor value does not change when the engine is stopped
and then the next cold engine start is performed, it is determined that a malfunction has occurred. If this is
detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is set.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

ECT Sensor cold start monitor:

DTC

P0116

Engine Coolant Temperature Circuit Range /
Performance Problem

DTC No.

DTC Detection Conditions

Trouble Areas

P0116

When either of following conditions met (2 trip detection
logic):
•

When cold engine started and engine warmed up, Engine
Coolant Temperature (ECT) sensor value does not
change.

•

After warmed up engine started, if ECT sensor value
does not change when engine stopped and then next
cold engine start performed, it determined that
malfunction has occurred.

•

Thermostat

•

ECT sensor

Related DTCs

P0116: ECT sensor cold start monitor
P0116: ECT sensor soak monitor

Required Sensors/Components (Main)

ECT sensor

Required Sensors/Components (Related)

Intake Air Temperature (IAT) sensor and Mass Air Flow (MAF) meter

Frequency of Operation

Once per driving cycle

Duration

10 seconds

MIL Operation

2 driving cycles

Sequence of Operation

None

Monitor runs whenever following DTCs not present

P0100 to P0103: MAF meter
P0110 to P0113: IAT sensor

Battery voltage

10.5 V or more

Time after engine start

1 second or more

ECT at engine start

Less than 60

°C (140°F)

IAT sensor circuit

Soak time

5 hours or more

Accumulated MAF

900 g or more

Engine

Running

Fuel cut

OFF

Difference between ECT at engine start and IAT

Less than 40

°C (72°F)

ES–120

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ECT Sensor soak monitor:

TYPICAL MALFUNCTION THRESHOLDS

ECT Sensor cold start monitor:

ECT Sensor soak monitor:

COMPONENT OPERATING RANGE

INSPECTION PROCEDURE

HINT:
•

If any of DTCs P0115, P0117, P0118 or P0125 are set simultaneously with DTC P0116, the ECT
sensor may have an open or a short circuit. Troubleshoot those DTCs first.

•

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 II / DTC INFO / CURRENT CODES.

(e) Read the DTC.

Result

Monitor runs whenever following DTCs not present

P0100 to P0103: MAF meter
P0110 to P0113: IAT sensor

Battery voltage

10.5 V or more

Engine

Running

Soak time

5 hours or more

Either (a) or (b) condition met

(a) ECT

°C (140°F) or more

(b) Accumulated MAF

5,000 g or more

ECT sensor value change

Less than 5

°C (9°F)

Difference between current ECT sensor value and previous ECT
sensor value when engine stopped

Less than 5

°C (9°F)

ECT

ECT sensor value changes in accordance with actual ECT

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0116)

Display (DTC Output)

Proceed To

P0116

P0116 and other DTCs

GO TO DTC CHART (See page

ES-57

)

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–121

(a) Remove the water inlet with thermostat (See page

CO-

(b) Check the valve opening temperature of the thermostat.

Standard:

°C to 84°C (176°F to 183°F)

HINT:
In addition to the above check, confirm that the valve is
completely closed when the temperature is below the
standard.

CO-

INSPECT WATER INLET WITH THERMOSTAT

REPLACE WATER INLET WITH
THERMOSTAT (See page

CO-12

)

REPLACE ENGINE COOLANT TEMPERATURE SENSOR (See page

ES-424

)

ES–122

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

HINT:
These DTCs relate to the Throttle Position (TP) sensor.

DESCRIPTION

This ETCS (Electronic Throttle Control System) does not use a throttle cable. The Throttle Position (TP)
sensor is mounted on the throttle body, and detects the opening angle of the throttle valve. This sensor is
a non-contact type, and uses Hall-effect elements, in order to yield accurate signals, even in extreme
driving conditions, such as at high speeds as well as very low speeds.
The TP sensor has two sensor circuits which each transmits a signal, VTA1 and VTA2. VTA1 is used to
detect the throttle valve angle and VTA2 is used to detect malfunctions in VTA1. The sensor signal
voltages vary between 0 V and 5 V in proportion to the throttle valve opening angle, and are transmitted to
the VTA terminals of the ECM.
As the valve closes, the sensor output voltage decreases and as the valve opens, the sensor output
voltage increases. The ECM calculates the throttle valve opening angle according to these signals and
controls the throttle actuator in response to driver inputs. These signals are also used in calculations such
as air-fuel ratio correction, power increase correction and fuel-cut control.

DTC

P0120

Throttle / Pedal Position Sensor / Switch "A"
Circuit

DTC

P0122

Throttle / Pedal Position Sensor / Switch "A"
Circuit Low Input

DTC

P0123

Throttle / Pedal Position Sensor / Switch "A"
Circuit High Input

DTC

P0220

Throttle / Pedal Position Sensor / Switch "B"
Circuit

DTC

P0222

Throttle / Pedal Position Sensor / Switch "B"
Circuit Low Input

DTC

P0223

Throttle / Pedal Position Sensor / Switch "B"
Circuit High Input

DTC

P2135

Throttle / Pedal Position Sensor / Switch "A" /
"B" Voltage Correlation

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