Toyota Corolla Quiz
Diagnostics

Inspection procedure

In this manual: Diagnostics
Introduction — 31Preparation — 32Service specifications — 19Diagnostics — 497Engine control system — 6Fuel — 13Emission control — 28Exhaust — 3Cooling — 13Lubrication — 7Ignition — 3Starting & charging — 13Front suspension — 12Rear suspension — 9Tire & wheel — 1Drive shaft / propeller shaft — 15Brake — 42Automatic transmission / trans — 47Clutch — 19Steering column — 9Power steering — 11Heater & air conditioner — 20Supplemental restraint system — 27Seat belt — 12Lighting — 18Wiper & washer — 9Audio & visual — 12Wiring — 1Communication system — 1Windshield/windowglass/mirror — 31Seat — 10Theft deterrent & door lock — 10Sliding roof/convertible — 8Engine hood/door — 12Exterior/interior trim — 20Vehicle control system — 1Cruise control — 5Maintenance — 8
15steps
~90min
4/5difficulty
Done 0 of 15
Hint

:
  • if different dtcs related to different systems that have terminal e2 as the ground terminal are output simultaneously, terminal e2 may be open.
  • Read freeze frame data using the hand-held tester or the obd ii scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air–fuel ratio was lean or rich, etc. At the time of the malfunction.
1 Read value of hand–held tester or obd ii scan tool(engine coolant temperature)
  1. Connect the hand–held tester or the obd ii scan tool to the dlc3.
  2. turn the ignition switch on and push the hand–held tester or the obd ii scan tool main switch on.
  3. select the item ”diagnosis / enhanced obd ii / data list / all / coolant temp” and read its value displayed on the hand–held tester or the obd ii scan tool.

Temperature: same value as the actual intake air temperature.

Result:

Hint:
Hint

: if there is an open circuit, the hand–held tester or the obd ii scan tool indicates –40 °C.

If there is a short circuit, the hand–held tester or the obd ii scan tool indicates 140 °C or more.
2 Read value of hand–held tester or obd ii scan tool(check for
2 Read value of hand–held tester or obd ii scan tool(check for open in wire harness)
Toyota Corolla. Read value of hand–held tester or obd ii scan tool
  1. Disconnect the e2 engine coolant temperature sensor connector.
  2. connect terminals 1 and 2 of the engine coolant temperature sensor connector on the wire harness side.
  3. turn the ignition switch on.
  4. select the item ”diagnosis / enhanced obd ii / data list / all / coolant temp” and read its value displayed on the hand–held tester or the obd ii scan tool.
Temperature value: 140 °C or more
  • reconnect the engine coolant temperature sensor connector.
    • Toyota Corolla. Read value of hand–held tester or obd ii scan tool
    3 Read value of hand–held tester or obd ii scan tool(check for
    3 Read value of hand–held tester or obd ii scan tool(check for open in ecm)
    Toyota Corolla. Read value of hand–held tester or obd ii scan tool
    1. Disconnect the e2 engine coolant temperature sensor connector.
    2. connect the terminals thw and e2 of the e3 ecm connector.
    Hint

    : before checking, do a visual and contact pressure check on the ecm connector.
  • turn the ignition switch on.
  • select the item ”diagnosis / enhanced obd ii / data list / all / coolant temp” and read its value displayed on the hand–held tester or the obd ii scan tool.
    • Temperature value: 140 °C or more
  • reconnect the engine coolant temperature sensor connector.
    • Toyota Corolla. Read value of hand–held tester or obd ii scan tool
    Confirm good connection at ecm. If ok, replace ecm
    Confirm good connection at ecm. If ok, replace ecm 4 Read value of hand–held tester or obd ii scan tool(check for short in wire harness)
    Toyota Corolla. Read value of hand–held tester or obd ii scan tool
    1. Disconnect the e2 engine coolant temperature sensor connector.
    2. turn the ignition switch on.
    3. select the item ”diagnosis / enhanced obd ii / data list / all / coolant temp” and read its value displayed on the hand–held tester or the obd ii scan tool.
    Temperature value: –40 °C
  • reconnect the engine coolant temperature sensor connector.
    • 5 Read value of hand–held tester or obd ii scan tool(check for
    5 Read value of hand–held tester or obd ii scan tool(check for short in ecm)
    Toyota Corolla. Read value of hand–held tester or obd ii scan tool
    1. Disconnect the e3 ecm connector.
    2. turn the ignition switch on.
    3. ) select the item ”diagnosis / enhanced obd ii / data list / all / coolant temp” and read its value displayed on the hand–held tester or the obd ii scan tool.
    Temperature: –40 °C
  • reconnect the ecm connector.
    • Toyota Corolla. Read value of hand–held tester or obd ii scan tool
    Replace ecm
    Replace ecm

    Test yourself

    A quick Toyota Corolla quiz: every answer comes with an explanation and a link to the manual page.