Toyota FJ Cruiser (GSJ 10, 15 series). Manual — part 45
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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HINT:
This DTC relates to the thermostat.
DESCRIPTION
This DTC is set when the Engine Coolant Temperature (ECT) does not reach 75
°C (167°F) despite
sufficient engine warm-up time.
MONITOR DESCRIPTION
The ECM estimates the ECT based on the starting temperature, engine loads, and engine speeds. The
ECM then compares the estimated temperature with the actual ECT. When the estimated ECT reaches
75
°C (167°F), the ECM checks the actual ECT. If the actual ECT is less than 75°C (167°F), the ECM
interprets this as a malfunction in the thermostat or the engine cooling system and sets the DTC.
DTC
P0128
Coolant Thermostat (Coolant Temperature
Below Thermostat Regulating Temperature)
DTC No.
DTC Detection Conditions
Trouble Areas
P0128
Conditions (a), (b) and (c) are met for 5 seconds (2 rip detection logic)
(a) Cold start
(b) Engine warmed up
(c) ECT less than 75
°C (167°F)
•
Thermostat
•
Cooling system
•
ECT sensor
•
ECM
Threshold
(75°C (167°F))
ECT
Time
DTC set (after 2 driving cycles)
Indicated ECT reading
Estimated ECT
5 seconds
A115933E01
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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
INSPECTION PROCEDURE
HINT:
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.
Related DTCs
P0128: Coolant Thermostat
Required Sensors/Components (Main)
Engine Coolant Temperature (ECT) sensor, Thermostat
Required Sensors/Components (Related)
Intake Air Temperature (IAT) sensor, Vehicle speed sensor
Frequency of Operation
Once per driving cycle
Duration
900 seconds
MIL Operation
2 driving cycles
Sequence of Operation
None
Monitor runs whenever following DTCs not present
P0010, P0020 (OCV Bank 1, 2)
P0011 (VVT System 1 - Advance)
P0012 (VVT System 1 - Retard)
P0021 (VVT System 2 - Advance)
P0022 (VVT System 2 - Retard)
P0031, P0032, P0051, P0052 (A/F sensor heater - Sensor 1)
P0100 - P0103 (MAF meter)
P0110 - P0113 (IAT sensor)
P0115 - P0118 (ECT sensor)
P0125 (Insufficient ECT for closed loop)
P0171, P0172, P0174, P0175 (Fuel system)
P0300 - P0306 (Misfire)
P0335 (CKP sensor)
P0340 (CMP sensor)
P0351 - P0356 (igniter)
P0500 (VSS)
P2196, P2198 (A/F sensor - rationality)
P2A00, P2A03 (A/F sensor - slow response)
Battery voltage
11 V or more
Either of following conditions 1 or 2 met:
-
1. All of following conditions met:
-
(a) ECT at engine start - IAT at engine start
-15
° to 7°C (-27° to 12.6°F)
(b) ECT at engine start
-10
° to 56°C (14° to 133°F)
(c) IAT at engine start
-10
° to 56°C (14° to 133°F)
2. All of following conditions met:
-
(a) ECT at engine start - IAT at engine start
More than 7
°C (12.6°F)
(b) ECT at engine start
56
°C (133°F) or less
(c) IAT at engine start
-10
°C (14°F) or more
Accumulated time with 80 mph (128 km/h) or more of vehicle speed
Less than 20 seconds
Duration that following conditions A and B met
5 seconds or more
A. Simulated ECT
75
°C (167°F) or more
B. ECT sensor output
Less than 75
°C (167°F)
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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(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 the DTC.
Result
HINT:
If any DTCs other than P0128 are output, troubleshoot
those DTCs first.
B
A
(a) Check for defects in the cooling system that might cause
the system to be too cold, such as abnormal radiator fan
operation or any modifications.
NG
OK
(a) Remove the water inlet with thermostat (See page
(b) Check the valve opening temperature of the thermostat.
Standard:
80
° to 84°C (176° to 183°F)
HINT:
In addition to the above check, confirm that the valve is
completely closed when the temperature is below the
standard.
(c) Reinstall the water inlet with thermostat (See page
NG
OK
1
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0128)
Display (DTC Output)
Proceed to
P0128
A
P0128 and other DTCs
B
GO TO DTC CHART (See page
)
2
CHECK COOLING SYSTEM
REPAIR OR REPLACE COOLING SYSTEM
3
INSPECT WATER INLET WITH THERMOSTAT (THERMOSTAT)
REPLACE WATER INLET WITH
THERMOSTAT (See page
REPLACE ECM (See page
)
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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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HINT:
Sensor 2 refers to the sensor mounted behind the Three-Way Catalytic Converter (TWC) and located far
from the engine assembly.
DESCRIPTION
In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen
oxide (NOx) components in the exhaust gas, a TWC (Three-Way Catalytic Converter) is used. For the
most efficient use of the TWC, the air-fuel ratio must be precisely controlled so that it is always close to
the stoichiometric air-fuel level. For the purpose of helping the ECM to deliver accurate air-fuel ratio
control, a Heated Oxygen (HO2) sensor is used.
The HO2 sensor is located behind the TWC, and detects the oxygen concentration in the exhaust gas.
Since the sensor is integrated with the heater that heats the sensing portion, it is possible to detect the
oxygen concentration even when the intake air volume is low (the exhaust gas temperature is low).
When the air-fuel ratio becomes lean, the oxygen concentration in the exhaust gas is rich. The HO2
sensor informs the ECM that the post-TWC air-fuel ratio is lean (low voltage, i.e. less than 0.45 V).
Conversely, when the air-fuel ratio is richer than the stoichiometric air-fuel level, the oxygen concentration
in the exhaust gas becomes lean. The HO2 sensor informs the ECM that the post-TWC air-fuel ratio is
rich (high voltage, i.e. more than 0.45 V). The HO2 sensor has the property of changing its output voltage
drastically when the air-fuel ratio is close to the stoichiometric level.
The ECM uses the supplementary information from the HO2 sensor to determine whether the air-fuel ratio
after the TWC is rich or lean, and adjusts the fuel injection time accordingly. Thus, if the HO2 sensor is
working improperly due to internal malfunctions, the ECM is unable to compensate for deviations in the
primary air-fuel ratio control.
DTC
P0136
Oxygen Sensor Circuit Malfunction (Bank 1
Sensor 2)
DTC
P0137
Oxygen Sensor Circuit Low Voltage (Bank 1
Sensor 2)
DTC
P0138
Oxygen Sensor Circuit High Voltage (Bank 1
Sensor 2)
DTC
P0156
Oxygen Sensor Circuit Malfunction (Bank 2
Sensor 2)
DTC
P0157
Oxygen Sensor Circuit Low Voltage (Bank 2
Sensor 2)
DTC
P0158
Oxygen Sensor Circuit High Voltage (Bank 2
Sensor 2)
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