W/Harness Inspection

Monitor Scantool Data

1. Ignition "ON" & Engine "OFF"
2. Disconnect IATS connector
3. Connect Scantool and monitor the "INT.AIR TEMP. SENSOR (V)" parameter on the Scantool data list.
4. Jumper the terminals 1 and 5 of the sensor harness connector together.
A. pacification : Approx. 0V




5. Is IAT data within the specification ?
YES
1) Possibility of sensor malfunction. Go to "Component Inspection" procedure.
NO
1) Go to next step as below.
6. Jumper the terminal 5 of the IATS harness connector to chassis ground.
7. Read "INT.AIR TEMP. SENSOR (V)" parameter on the Scantool.
A. Specification : Approx. 0V
8. Is IAT data within the specification ?
YES
1) Possibility of open in IAT ground circuit Go to "Ground Circuit Inspection" procedure.
NO
1) Possibility of open or short to battery in IAT signal circuit. Go to "Signal Circuit Inspection" procedure.

Monitor DTC Status

1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode
2. Press F5 (INFO) to select DTC information from the DTCs menu
3. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions
4. Read "DTC Status" parameter




5. Is parameter displayed "History (Not Present) fault" ?

CAUTION:
- History (Not Present) fault : DTC occurred but has been cleared.
- Present fault : DTC is occurring at present time.

YES
1) Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
1) Go to "Monitor Scantool Data" procedure

Ground Circuit inspection

1. Ignition "OFF"
2. Disconnect ECM connector
3. Measure resistance between terminals 1 of the sensor harness connector and 9 of the ECM harness connector
A. Specification : Approx. 0 ohms




4. Is resistance within the specification ?
YES
1) Go to "Terminal and Connector Inspection" procedure
NO
1) Repair open circuit and go to "Verification of Vehicle Repair" procedure

Signal Circuit Inspection

Check for Open in Signal Circuit
1. Measure resistance between terminals 5 of the sensor harness connector and 18 of the ECM harness connector
A. Specification : Approx. 0 ohms




2. Is resistance within the specification ?
YES
1) Go to next step as below
NO
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for Short to Battery in Signal Circuit
1. Ignition "ON" & Engine "OFF"
2. With IATS and ECM connector still disconnected, measure voltage between terminals 5 of sensor harness connector and 18 of the ECM harness connector
A. Specification : Approx. 0V




3. Is voltage within the specification ?
YES
1) Go to "Terminal and Connector Inspection" procedure.
NO
1) Repair open circuit and go to "Verification of Vehicle Repair" procedure

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found ?
YES
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
1) Go to "Component Inspection" procedure