Toyota Corolla Repair Manual: Check mode procedure
1. Dtc check (check mode)
Hint
: hand–held tester only: compared to the normal mode, the check mode has more sensing ability to detect malfunctions. Furthermore, the same diagnostic items which are detected in the normal mode can also be detected in the check mode.
- Procedure for check mode using the hand–held tester.
- Check the initial conditions.
Battery positive voltage 11 v or more throttle valve fully closed transaxle in the p or n position a/c switch is off
- turn the ignition switch off.
- Connect the hand–held tester to the dlc3.
- Turn the ignition switch to the on position.
- Switch the hand–held tester from the normal mode to the check mode (check that the mil flashes).
Notice
: if the hand–held tester switches the ecm from the normal mode to the check mode or vice–versa, or if the ignition switch is turned from the on position to the acc or lock position during the check mode, the dtc and freeze frame data will be erased.
- Start the engine (mil goes off after the engine starts).
- Simulate the conditions of the malfunction described by the customer.
Notice
: leave the ignition switch in the on position until you have checked the dtcs, etc.
- After simulating malfunction conditions, use the
hand–held tester diagnosis selector to check the
dtcs and freeze frame data, etc.
Hint
: be sure not to turn the ignition switch off, as turning it off switches the diagnosis system from the check mode to the normal mode, which erases all the dtcs, etc.
- After checking the dtc, inspect the applicable circuit.
2. Dtc clear
- When using the obd ii scan tool or hand–held tester: clearing the dtcs.
- Connect the obd ii scan tool or hand–held tester to the dlc3.
- Turn the ignition switch to the on position.
- When operating the obd ii scan tool (complying with sae j1978) or hand–held tester to erase the codes, the dtcs and freeze frame data will be erased. (See the obd ii scan tool’s instruction book for operating instructions.)
- when not using the obd ii scan tool or hand–held tester: clearing the dtcs.
- Disconnecting the battery terminal or remove the efi and etcs fuses from the engine room j/b for 60 seconds or more.
Dtc check/clear
1. Dtc check (normal mode)
Notice:
hand–held tester only:
when the diagnostic system is switched from the normal
mode to the check mode, all the dtcs and freeze frame
data recorded in the normal ...
Road test
1. Problem symptom confirmation
Taking into consideration the results of the customer problem analysis,
try to reproduce the symptoms
of the trouble. If the problem is that the transaxle does ...
Other materials:
Pre–check
1. Pre–check
Check that the cruise control actuator assy, acceleration wire,
accelerator auto drive cable assy, and
link assy are installed correctly and that the wire and link are securely
connected.
check that the operating movement of the acceleration pedal, cruise
control actuat ...
Symptom confirmation and diagnostic trouble code
Hint:
the diagnostic system in corolla has various functions. The first
function is the diagnostic trouble
code (dtc) check, in which a malfunction in the signal circuits to the ecu
is stored in code form in
the ecu memory. Another function is the input signal check, which checks if
...
Circuit description
The actuator motor is operated by signals from the cruise control ecu assy.
Acceleration and deceleration
signals are transmitted by changes in the duty ratio (see below).
Duty ratio:
the duty ratio is the ratio of the period of continuity in one cycle. For
example, if a is the period of co ...