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:
Circuit description
The side airbag sensor assy (rh) circuit consists of the diagnosis circuit
and lateral deceleration sensor, etc.
It receives signals from the lateral deceleration sensor, judges whether or not
the srs must be activated,
and detects diagnosis system malfunction.
Dtc b1140/32 is recorded wh ...
On–vehicle inspection
1. Check battery electrolyte level
Check the electrolyte quantity of each cell (maintenance–free battery).
If under the lower level, replace the battery (or add distilled
water if possible) and check the charging
system.
check the electrolyte quantity of each cell ...
Circuit description
Refer to dtc p0115
Dtc no.
Dtc detection condition
Trouble area
P0125
If the engine coolant temperature (ect) was less than –6.6 °C
(20 °F) when starting the engine, and 20 minutes after the engine
start, the ect sensor still indicates below 20 °C (68 ...