Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 37
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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TYPICAL MALFUNCTION THRESHOLDS
WIRING DIAGRAM
Refer to DTC P0100 (See page
CONFIRMATION DRIVING PATTERN
HINT:
Performing this confirmation pattern will activate the mass air flow performance monitor.
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the tester ON.
4. Clear DTCs (See page
5. Start the engine, and warm it up until the engine coolant temperature reaches 70
°C (158°F) or higher.
6. Drive the vehicle at approximately 62 mph (100 km/h) for 20 seconds or more.
7. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO /
PENDING CODES and check if any DTCs (any pending DTCs) are set.
Engine coolant temperature
70
°C (158°F) or more
IAT sensor circuit
OK
ECT sensor circuit
OK
CKP sensor circuit
OK
TP sensor circuit
OK
Canister pressure sensor circuit
OK
EVAP leak detection pump
OK
EVAP vent valve
OK
Both of following conditions 1 and 2 met
-
1. Averaged engine load value ratio
Less than 0.85, or more than 1.17 (varies with estimated engine load)
2. Averaged air-fuel ratio
Less than -20 %, or more than 20 %
Vehicle Speed
Approximately 62 mph
(100 km/h)
Idling
Warming Up
20 seconds or more
Time
A112632E01
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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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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.
(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch to 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 P0101 are output, troubleshoot those
DTCs first.
B
A
(a) Check the air induction system for vacuum leakage.
OK:
No leakage from air induction system.
NG
OK
OK:
PCV hose is connected correctly and is not damaged.
NG
OK
1
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0101)
Display (DTC Output)
Proceed To
P0101
A
P0101 and other DTCs
B
GO TO DTC CHART
2
CHECK AIR INDUCTION SYSTEM
REPAIR OR REPLACE AIR INDUCTION
SYSTEM
3
CHECK PCV HOSE CONNECTIONS
REPAIR OR REPLACE PCV HOSE
REPLACE MASS AIR FLOW METER (See page
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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DESCRIPTION
The Intake Air Temperature (IAT) sensor, mounted on the Mass Air Flow (MAF) meter, monitors the IAT.
The IAT sensor has a built in thermistor with a resistance that varies according to the temperature of the
intake air. When the IAT is low, the resistance of the thermistor increases. When the temperature is high,
the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes (see
Fig. 1).
The IAT sensor is powered by a 5 V supply from the THA terminal of the ECM, via resistor R.
Resistor R and the IAT sensor are connected in series. When the resistance value of the IAT sensor
changes, according to changes in the IAT, the voltage at terminal THA also varies.
Based on this signal, the ECM increases the fuel injection volume when the engine is cold to improve
driveability.
HINT:
When any of DTCs P0110, P0112 and P0113 are set, the ECM enters fail-safe mode. During fail-safe
mode, the IAT is estimated to be 20
°C (68°F) by the ECM. Fail-safe mode continues until a pass condition
is detected.
DTC
P0110
Intake Air Temperature Circuit
DTC
P0112
Intake Air Temperature Circuit Low Input
DTC
P0113
Intake Air Temperature Circuit High Input
DTC No.
Proceed To
DTC Detection Conditions
Trouble Areas
P0110
Step 1
Open or short in Intake Air Temperature
(IAT) sensor circuit for 0.5 seconds (1 trip
detection logic)
•
Open or short in IAT sensor circuit
•
IAT sensor (built into MAF meter)
•
ECM
P0112
Step 4
Short in Intake Air Temperature (IAT)
sensor circuit for 0.5 seconds (1 trip
detection logic)
•
Short in IAT sensor circuit
•
IAT sensor (built into MAF meter)
•
ECM
P0113
Step 2
Open in Intake Air Temperature (IAT)
sensor circuit for 0.5 seconds (1 trip
detection logic)
•
Open in IAT sensor circuit
•
IAT sensor (built into MAF meter)
•
ECM
kΩ
Acceptable
°C (°F)
(Figure 1)
A056276E08
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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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HINT:
When any of these DTCs are set, check the IAT by selecting the following menu items on an intelligent
tester: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR.
MONITOR DESCRIPTION
The ECM monitors the sensor voltage and uses this value to calculate the Intake Air Temperature (IAT).
When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a
malfunction in the IAT sensor and sets a DTC.
Example:
If the sensor voltage output is more than 4.91 V for 0.5 seconds or more, the ECM determines that there
is an open in the IAT sensor circuit, and sets DTC P0113. Conversely, if the voltage output is less than
0.18 V for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit, and sets
DTC P0112.
If the malfunction is not repaired successfully, a DTC is set 0.5 seconds after the engine is next started.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
P0110:
P0112:
P0113:
COMPONENT OPERATING RANGE
Temperature Displayed
Malfunctions
-40
°C (-40°F)
Open circuit
140
°C (284°F) or higher
Short circuit
Related DTCs
P0110: Intake air temperature sensor open/short (Fluctuating)
P0112: Intake air temperature sensor short (Low voltage)
P0113: Intake air temperature sensor open (High voltage)
Required Sensors/Components (Main)
Intake Air Temperature (IAT) sensor
Required sensors/Components (Related)
-
Frequency of Operation
Continuous
Duration
0.5 seconds
MIL Operation
Immediate
Sequence of Operation
None
Monitor runs whenever following DTCs not present
None
Intake air temperature sensor voltage
Less than 0.18 V, or more than 4.91 V
Intake air temperature sensor voltage
Less than 0.18 V
Intake air temperature sensor voltage
More than 4.91 V
Intake air temperature sensor voltage
0.18 V to 4.91 V
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