Toyota Corolla (E120) 2002–2008 Repair Manual / Diagnostics / Sfi system / Engine coolant temperature circuit / Inspection procedure
Toyota Corolla (E120): Inspection procedure
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)
- Connect the hand–held tester or the obd ii scan tool to the dlc3.
- turn the ignition switch on and push the hand–held tester or the obd ii scan tool main 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: same value as the actual intake air temperature.
Result:
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 open in wire harness)
- Disconnect the e2 engine coolant temperature sensor connector.
- connect terminals 1 and 2 of the engine coolant temperature sensor connector on the wire harness side.
- 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 (284°f) or more
- reconnect the engine coolant temperature sensor connector.
3 Read value of hand–held tester or obd ii scan tool(check for open in ecm)
- Disconnect the e2 engine coolant temperature sensor connector.
- 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 (284°f) or more
- reconnect the engine coolant temperature sensor connector.
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)
- Disconnect the e2 engine coolant temperature sensor 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: –40 °C (–40°f)
- reconnect the engine coolant temperature sensor connector.
5 Read value of hand–held tester or obd ii scan tool(check for short in ecm)
- Disconnect the e3 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: –40 °C (–40°f)
- reconnect the ecm connector.
Replace ecm
Other materials:
Engine (ignition) switch (vehicles
without a smart key system)
Starting the engine
1. Check that the parking brake
is set.
2. Check that the shift lever is in
P.
3. Firmly depress the brake
pedal.
4. Turn the engine switch to
START to start the engine.
■If the engine does not start
The engine immobilizer system may
not have been deactivated.
Contact your Toy ...
Odometer and trip meter
display
■ Changing the display
Press the display change button
until the desired item is displayed.
■ Display items
Odometer
Displays the total distance the vehicle
has been driven.
Trip meter A/Trip meter B
Displays the distance the vehicle
has been driven since the meter
was last reset. Trip me ...
Replacement
Hint: components:
1. Precaution
2. Disconnect battery negative terminal
3. Remove horn button assy
Place the front wheels facing straight ahead.
using a torx socket wrench (t30), loosen the 2 torx
screws until the groove along the screw circumference
catches on the screw ca ...