Dtc summary
Description
The description can be found in the evap (evaporative emission) system (see page es-335).
Inspection procedure
Refer to the evap system (see page es-340).
Monitor description
The two monitors, key-off and purge flow, are used to detect malfunctions relating to dtc p0441. The key-off monitor is initiated by the ecm internal timer, known as the soak timer, 5 hours* after the ignition switch is turned off. The purge flow monitor runs while the engine is running.
5 Hours* after the ignition switch is turned off, the leak detection pump creates negative pressure (vacuum) in the evap system. The ecm monitors for leaks and actuator malfunctions based on the evap pressure.
Hint:
*: If the engine coolant temperature is not below 35°c (95°f) 5 hours after the ignition switch is turned off, the monitor check starts 2 hours later. If it is still not below 35°c (95°f) 7 hours after the ignition switch is turned off, the monitor check starts 2.5 Hours later.
*: If only a small amount of fuel is in the fuel tank, it takes longer for the evap pressure to stabilize.
In operation c, the leak detection pump creates negative pressure (vacuum) in the evap system.
The evap system pressure is then measured by the ecm using the canister pressure sensor. If the stabilized system pressure is higher than [second reference pressure x 0.2], The ecm interprets this as the purge vsv (vacuum switching valve) being stuck open. The ecm illuminates the mil and sets the dtc (2 trip detection logic).
In operation d, the canister pressure sensor measures the evap system pressure. The pressure measurement for purge vsv monitor is begun when the purge vsv is turned on (open) after the evap leak check. When the measured pressure indicates an increase of 0.3 Kpa-g (2.25 Mmhg-g) or more, the purge vsv is functioning normally. If the pressure does not increase, the ecm interprets this as the purge vsv being stuck closed. The ecm illuminates the mil and sets the dtc (2 trip detection logic).
The purge flow monitor consists of the two step monitors. The 1st monitor is conducted every time and the 2nd monitor is activated if necessary.
While the engine is running and the purge vsv is on (open), the ecm monitors the purge flow by measuring the evap pressure change. If negative pressure is not created, the ecm begins the 2nd monitor.
The vent valve is turned on (closed) and the evap pressure is then measured. If the variation in the pressure is less than 0.5 Kpa-g (3.75 Mmhg-g), the ecm interprets this as the purge vsv being stuck closed, and illuminates the mil and sets dtc p0441 (2 trip detection logic).
Atmospheric pressure check: in order to ensure reliable malfunction detection, the variation between the atmospheric pressures, before and after conduction of the purge flow monitor, is measured by the ecm.
Obd ii monitor specifications
Obd ii monitor specifications
Monitor result
Refer to checking monitor status (see page es-17).
Data list / active test
Read data list
Hint:
Using the intelligent tester's data list allows switch,
sensor, actuator and other item values to be read without
removing any parts. Reading the data list early in
troubleshooting is one way to save time.
Connect the intelligent tester (with can vim) to the
dlc3 ...
Air mix control servo motor (for automatic air conditioning system)
Components
Removal
Remove air conditioning unit
Remove the air conditioning radiator (see page ac-
185).
Remove air mix control servo motor (see
page ac-191)
Inspection
Inspect air mix control servo motor
Inspect the servo motor operation.
Connect ...
Tire pressure warning light circuit
Description
If the tire pressure warning ecu detects trouble, the tire pressure warning
light turns on and tire pressure
monitor is canceled at the same time. At this time, the ecu records a dtc in
memory.
Connect terminals tc and cg of the dlc3 to make the tire pressure warning light
bli ...