Toyota Celica 2005 Repair Manual page 454

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 Check operation of speedometer.
CHECK:
Drive the vehicle and check if the operation of the speedmeter in the combination meter is normal.
HINT:
The vehicle speed sensor is operating normally if the speedometer display is normal.
OK
2 Check voltage between terminal SPD of ECM connector and body ground.
ON
A09084
4.5 to 5.5V
0V
OK
Replace ECM (See page SF−78).
2005 CELICA (RM1131U)
DIAGNOSTICS
NG
PREPARATION:
(a) Remove the ECM cover.
(b) Shift the shift lever to neutral.
(c) Jack up one of the front wheels.
(d) Turn the ignition switch ON.
CHECK:
Measure voltage between terminal SPD of ECM connector and
body ground when the wheel is turned slowly.
SPD
OK:
A09092
Voltage is generated intermittently.
HINT:
The output voltage should fluctuate up and down similarly to the
diagram on the left when the wheel is turned slowly.
Turn Wheel
NG
A21424
− ENGINE (1ZZ−FE)
Check speedometer circuit. See combination
meter troubleshooting (See page BE−2).
Repair or replace harness or connector.
453
DI−255