Toyota Tacoma manuals

Toyota Corolla Repair Manual: Inspection procedure

Hint

:

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 (–40°f).

If there is a short circuit, the hand–held tester or the obd ii scan tool indicates 140 °C (284°f) 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)

  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 (284°f) or more

  5.  reconnect the engine coolant temperature sensor connector.

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)

  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.

  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 (284°f) or more

  5.  reconnect the engine coolant temperature sensor connector.

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)

  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 (–40°f)

  4.  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)

  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 (–40°f)

  4.  reconnect the ecm connector.

Replace ecm

Replace ecm

Circuit description
A thermistor is built in the engine coolant temperature sensor and changes the resistance value according to the engine coolant temperature. The structure of the sensor and connection to the ecm ...

Engine coolant temp. Circuit range/performance problem
Dtc p0116 engine coolant temp. Circuit range/performance problem ...

Other materials:

Initialization
1. Reset memory Caution: perform the reset memory (at initialization) when replacing the automatic transaxle assy, engine assy or ecm. Notice: hand–held tester only Turn the ignition switch off.  connect the hand–held tester to the dlc3.  turn the ignition switch to the on ...

Circuit description
Hint: these dtcs indicate a malfunction related to the primary circuit. If dtc p0351 is displayed, check the no.1 Ignition coil with igniter circuit. If dtc p0352 is displayed, check the no.2 Ignition coil with igniter circuit. If dtc p0353 is displayed, check the no.3 Ignition coil ...

Engine assembly
Inspection 1. Inspect coolant 2. Inspect engine oil 3. Inspect battery 4. Inspect air cleaner filter element sub–assy 5. Inspect spark plug 6. Inspect fan and generator v belt Hint: you don’t need to check the belt deflection because auto tensioner is adopted. 7. Inspect ignition timing ...

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