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:
Eco Driving Indicator Light customization (except vehicles with a manual transmission)
Eco Driving Indicator Light can be activated or deactivated.
1 While the odometer is being displayed, press and hold the “DISP” switch to
display the Eco Driving Indicator Light customization screen.
2 Press the “DISP” switch to set Eco Driving Indicator Light to on or off.
3 Press and ...
Overhaul
1. Remove manual transaxle assy
2. Remove clutch release fork sub–assy
Remove the clutch release fork with clutch release bearing
from the transaxle assy.
3. Remove clutch release bearing assy
remove the clutch release bearing assy from the clutch
release fork.
4. Re ...
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 malf ...