Sfi System - P0113

Brand:

Toyota

Model Name:

4Runner GRN210 215 UZN210 215

Manual:

Repair Manual

Section:

2Uz-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Monitor description

  3. Monitor strategy

  4. Typical enabling conditions

  5. Typical malfunction thresholds

  6. Component operating range

  7. Wiring diagram

  8. Inspection procedure

  9. Read value of intelligent tester (intake air temperature)

  10. Read value of intelligent tester (check for open in wire harness)

  11. Read value of intelligent tester (check for open in ecm)

  12. Read value of intelligent tester (check for short in wire harness)

  13. Read value of intelligent tester (check for short in ecm)

DTC P0110 Intake Air Temperature Circuit

DTC P0112 Intake Air Temperature Circuit Low Input

DTC P0113 Intake Air Temperature Circuit High Input


​

DESCRIPTION

  1. Open or short in Intake Air Temperature (IAT) sensor circuit 4Runner
    The Intake Air Temperature (IAT) sensor, built into the Mass Air Flow (MAF) meter, monitors the intake air temperature. The IAT sensor has a thermistor that varies its resistance depending on the intake air temperature. When the intake air temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. The variations in resistance are reflected as voltage changes to the ECM terminal (see Fig. 1).
    The IAT sensor is connected to the ECM. The 5 V power source voltage in the ECM is applied to the IAT sensor from terminal THA via resistor R.
    The resistor R and the IAT sensor are connected in series. When the resistance value of the IAT sensor changes in accordance with changes in the intake air temperature, the voltage at terminal THA (THAR) also changes. Based on this signal, the ECM increases the fuel injection volume to improve driveability during cold engine operation.

DTC No.
Proceed to
DTC Detection Condition
Trouble Area
P0110
Step 1
Open or short in IAT sensor circuit for 0.5 seconds
  1. Open or short in Intake Air Temperature (IAT) sensor circuit
  2. Intake Air Temperature (IAT) sensor (built into Mass Air Flow [MAF] meter)
  3. ECM
P0112
Step 4
Short in IAT sensor circuit for 0.5 seconds
  1. Short in IAT sensor circuit
  2. IAT sensor (built into MAF meter)
  3. ECM
P0113
Step 2
Open in IAT sensor circuit for 0.5 seconds
  1. Open in IAT sensor circuit
  2. IAT sensor (built into MAF meter)
  3. ECM
HINT:
After confirming DTC "P0110, P0112 or P0113", use the intelligent tester to confirm the intake air temperature in the "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL".

Temperature Displayed
Malfunction
-40°C (-40°F)
Open circuit
140°C (284°F)
Short circuit

MONITOR DESCRIPTION

The ECM monitors the sensor voltage and uses this value to calculate the intake air temperature. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a fault in the IAT sensor and sets a DTC.
Example:
When the sensor voltage output is -40°C (-40°F) or more than 140°C (284°F).

MONITOR STRATEGY


Related DTCs
P0110: IAT sensor range check (fluttering)
P0112: IAT sensor range check (low resistance)
P0113: IAT sensor range check (high resistance)
Required Sensors/Components (Main)
IAT sensor
Required Sensors/Components (Related)
-
Frequency of Operation
Continuous
Duration
0.5 seconds
MIL Operation
Immediate
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


Monitor will run whenever these DTCs are not present
None
The typical enabling condition is not available
-

TYPICAL MALFUNCTION THRESHOLDS


P0110:
IAT sensor voltage [Intake air temperature]
Less than 0.18 V, or more than 4.91 V (More than 140°C (284°F), or less than -40°C (-40°F))

P0112:
IAT sensor voltage [Intake air temperature]
Less than 0.18 V (More than 140°C (284°F))

P0113:
IAT sensor voltage [Intake air temperature]
More than 4.91 V (Less than -40°C (-40°F))

COMPONENT OPERATING RANGE


IAT sensor resistance [IAT]
0.18 V (140°C (284°F)) to 4.91 V (-40°C (-40°F))

WIRING DIAGRAM


If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit. 4Runner


INSPECTION PROCEDURE

HINT:
  1. If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
  2. Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
1.READ VALUE OF INTELLIGENT TESTER (INTAKE AIR TEMPERATURE)

  1. Connect the intelligent tester to the DLC3 with CAN VIM.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

  1. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR.

  1. Read the values.

    Standard:
    Same value as actual Intake Air Temperature (IAT).

    Result:

    Intake Air Temperature
    		Proceed to
    -40°C (-40°F)
    		A
    140°C (284°F) or more
    		B
    OK (same as present temperature)
    		C
    HINT:
    1. If there is an open circuit, the intelligent tester indicates -40°C (-40°F).
    2. If there is a short circuit, the intelligent tester indicates 140°C (284°F) or more.


Bnext
Go to step 4

Cnext
CHECK FOR INTERMITTENT PROBLEMS
A
next down

2.READ VALUE OF INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)
  1. Disconnect the M1 Mass Air Flow (MAF) meter connector. 4Runner

  2. Disconnect the M1 Mass Air Flow (MAF) meter connector.

  1. Connect terminals THA and E2 of the MAF meter wire harness side connector.

  1. Connect the intelligent tester to the DLC3 with CAN VIM.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

  1. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR.

  1. Read the value.

    Standard:
    140°C (284°F)

  1. Reconnect the MAF meter connector.



OKnext
CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER
NG
next down

3.READ VALUE OF INTELLIGENT TESTER (CHECK FOR OPEN IN ECM)
  1. Disconnect the M1 MAF meter connector. 4Runner

  2. Disconnect the M1 MAF meter connector.

  1. Connect terminals THA and E2 of the E4 ECM connector.

    HINT:
    Before checking, do a visual and contact pressure check for the ECM connector.

  1. Connect the intelligent tester to the DLC3 with CAN VIM.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

  1. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR.

  1. Read the value.

    Standard:
    140°C (284°F)

  1. Reconnect the MAF meter connector.



NGnext
CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM
OK
next down
REPAIR OR REPLACE HARNESS OR CONNECTOR

4.READ VALUE OF INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)
  1. Disconnect the M1 MAF meter connector. 4Runner

  2. Disconnect the M1 MAF meter connector.

  1. Connect the intelligent tester to the DLC3 with CAN VIM.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

  1. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR.

  1. Read the value.

    Standard:
    -40°C (-40°F)

  1. Reconnect the MAF meter connector.



OKnext
REPLACE MASS AIR FLOW METER
NG
next down

5.READ VALUE OF INTELLIGENT TESTER (CHECK FOR SHORT IN ECM)
  1. Disconnect the M1 MAF meter connector. 4Runner

  2. Disconnect the M1 MAF meter connector.

  1. Disconnect the E4 ECM connector.

  1. Connect the intelligent tester to the DLC3 with CAN VIM.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

  1. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR.

  1. Read the value.

    Standard:
    -40°C (-40°F)

  1. Reconnect the ECM connector.

  1. Reconnect the MAF meter connector.



NGnext
REPLACE ECM
OK
next down
REPAIR OR REPLACE HARNESS OR CONNECTOR