Toyota Celica 2005 Repair Manual page 273

DI−74
INSPECTION PROCEDURE
HINT:
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, freeze frame data can help deter-
mine if the vehicle was running or stopped, if the engine was warmed up or not, if the air−fuel ratio was lean
or rich, as well as other data from the time when a malfunction occurred.
1 Connect OBD II scan tool or hand−held tester, and read value of mass air flow
rate.
PREPARATION:
(a) Connect the OBD II scan tool or hand−held tester to the DLC3.
(b) Turn ignition switch ON and push the OBD II scan tool or hand−held tester main switch ON.
(c) Start the engine.
(d) When using hand−held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA
LIST/ALL/MAF.
CHECK:
Read mass air flow rate on the OBD II scan tool or hand−held tester.
RESULT:
Between 1.0 and 270.0 (*1)
*1: The value must be changed when the throttle valve is opened or closed.
A
2005 CELICA (RM1131U)
DIAGNOSTICS
Air Flow Rate (gm/s)
0.0
271.0 or more
− ENGINE (1ZZ−FE)
B Go to step 6.
C Check for intermittent problems (See page
DI−3).
272
Proceed to
A
B
C