Diagnostic Trouble Code Clearance - Toyota 1 MZ–FE Manual

EG2–403
1MZ–FE ENGINE – DIAGNOSIS SYSTEM
DIAGNOSTIC TROUBLE CODE CHECK
1. Initial conditions.
(a) Battery positive voltage 11 V or more.
(b) Throttle valve fully closed.
(c) Transmission in park or neutral position.
(d) Air conditioning switched OFF.
2. Turn ignition switch OFF.
3. Prepare the TOYOTA hand–held tester.
4. Connect the TOYOTA hand–held tester to data link con–
nector 3 in the fuse box at the lower left of the instrument
panel.
5. Turn the ignition switch ON and switch the TOYOTA
hand–held tester ON.
6. Switch the TOYOTA hand–held tester normal mode to
check mode. (Check that the MIL flashes.)
7. Start the engine. (The MIL goes out after the engine
start.)
8. Simulate the conditions of the malfunction described by
the customer.
NOTICE: Leave the ignition switch ON until you have
checked the diagnostic trouble codes, etc.
9. After simulating the malfunction conditions, use the
TOYOTA hand–held tester diagnosis selector to check
the diagnostic trouble codes and freezed frame data, etc.
HINT: Take care not to turn the ignition switch OFF.
Turning the ignition switch OFF switches the diagnosis
system from check mode to normal mode, so all diagnos–
tic codes, etc. are erased.
10. After checking the diagnostic trouble code, inspect the
applicable circuit.

DIAGNOSTIC TROUBLE CODE CLEARANCE

The following actions will erase the diagnostic trouble codes
and freezed frame data.
1. Operating the OBDII scan tool (complying with SAE
J1978) or TOYOTA hand–held tester to erase the codes.
(See the OBDII scan tool's instruction book for operat–
ing instructions.)
2. Disconnecting the battery terminals or EFI fuse.
NOTICE: If the TOYOTA hand–held tester switches the
ECM from normal mode to check mode or vice–versa, or if
the ignition switch is turned from ON to ACC or OFF during
check mode, the diagnostic trouble codes and freezed
frame data will be erased.