Toyota Corolla (E120) 2002–2008 Repair Manual / Diagnostics / Cruise control system / Diagnosis circuit / Inspection procedure
Toyota Corolla (E120): Inspection procedure
1 Inspect dlc3 terminal voltage
- Turn the ignition switch to on.
- measure voltage between terminals 13 (tc) and 4 (cg) of
dlc3.
Ok: voltage: 10 – 16 v
2 Check harness and connector(between cruise control ecu assy and dlc3)
- Check for open and short circuit in harness and connector between cruise control ecu assy and dlc3
Check and replace cruise control ecu assy
Other materials:
Inspection procedure
Hint:
if dtc p0441 (purge flow), p0446 (vsv for ccv or vsv for pressure
switching valve), p0451, p0452
or p0453 is output with dtc p0442 or p0456 , first troubleshoot
dtc p0441, p0446, p0451, p0452 or p0453. If no malfunction is detected,
troubleshoot dtc
p0442 or p0456 next.
...
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 ...
Inspection procedure
Hint:
hand–held tester only:
narrowing down the trouble area is possible by performing ”a/f control” active
test (heated oxygen
sensor or other trouble areas can be distinguished).
perform active test using hand–held tester (a/f control).
Hint:
”a/f control” is the act ...