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DI-834
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDS6-01
DTC P2401 Evaporative Emission System Leak Detec-
tion Pump Control Circuit Low
DTC P2402 Evaporative Emission System Leak Detec-
tion Pump Control Circuit High
CIRCUIT DESCRIPTION
Refer to EVAP Inspection Procedure (see page DI-884).
Detection Detection
DTCs Monitoring Item DTC Detection Condition Trouble Areas
Timing Logic
One of following conditions are met:
S 0.02 inch orifice low-flow
P2401 Vacuum pump stuck OFF S 0.02 inch orifice high-low
S Pump module While
S Vacuum pump ON stuck
S Connector / Wire harness ignition
S Vacuum pump OFF stuck 2 trips
(Pump module - ECM) switch
S Vent valve ON (Closed) stuck
S ECM OFF
P2402 Vacuum pump stuck ON NOTE:
P043E, P043F, P2401, P2402 and P2419
have same DTC detection conditions.
WIRING DIAGRAM
Refer to EVAP Inspection Procedure (see page DI-884).
DI-835
DIAGNOSTICS - ENGINE (2UZ-FE)
MONITOR DESCRIPTION
5 hours* after the ignition switch is turned OFF, the electric vacuum pump creates negative pressure (vacu-
um) in the EVAP (Evaporative Emission) 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.
Sequence Operations Descriptions Duration
- ECM activation Activated by soak timer, 5 hours (7 or 9.5 hours) after ignition switch turned to OFF. -
Vent valve turned OFF (vent) and EVAP system pressure measured by ECM in order to
Atmospheric pressure register atmospheric pressure.
A 10 seconds
measurement If EVAP pressure is not between 70 kPa and 110 kPa (525 mmHg and 825 mmHg), ECM
cancels EVAP system monitor.
First 0.02 inch leak In order to determine 0.02 inch leak pressure standard, vacuum pump creates negative pres-
B pressure measure- sure (vacuum) through 0.02 inch orifice and then ECM checks if vacuum pump and vent 60 seconds
ment valve operate normally.
Vent valve turned ON (closed) to shut EVAP system.
Negative pressure (vacuum) created in EVAP system, and EVAP system pressure then
EVAP system pres-
C measured. 15 minutes*
sure measurement
Write down the measured value as it will be used in the leak check.
If EVAP pressure does not stabilize within 15 minutes, ECM cancels EVAP system monitor.
Purge VSV opened and then EVAP system pressure measured by ECM.
D Purge VSV monitor 10 seconds
Large increase indicates normal.
Second 0.02 inch leak Leak check is performed after second 0.02 inch leak pressure standard is measured.
E pressure measure- If stabilized system pressure higher than second 0.02 inch leak pressure standard, ECM 60 seconds
ment determines that EVAP system leaking.
F Final check Atmospheric pressure measured and then monitoring result recorded by ECM. -
* If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.
DI-836
DIAGNOSTICS - ENGINE (2UZ-FE)
Operation A: Atmospheric Pressure Measurement Operation B: 0.02 Inch Leak Pressure Measurement
Canister
Fuel Tank
Vent Valve: OFF (vent) OFF OFF (vent)
Purge VSV: OFF
0.02 Inch Orifice
Pressure Sensor
Air Filter ON
Vacuum Pump: OFF Pump Module
Operation C: EVAP Leak Check Operation D: Purge VSV monitor
OFF ON (closed) ON ON (closed)
Atmospheric
Pressure
Negative
Pressure
ON ON
A23480
In sequence B and E, to determine the leak criterion, the vacuum pump creates negative pressure in the
canister pump module through the 0.02 inch orifice. If the pressure is out of specified range or is not satu-
rated, the ECM illuminates the MIL and sets DTCs P043E, P043F, P2401, P2402 and P2419 (2-trip detec-
tion logic).
EVAP Pressure during EVAP Monitor
Purge VSV OFF OFF ON: Open
OFF: Closed
Vent Valve OFF OFF ON: Closed
OFF: Vent
Vacuum Pump ON ON
Malfunction
Malfunction
EVAP Pressure
-1 kPa OK OK
Specified Malfunction Malfunction
Range
-4.85 kPa
Sequence A B C D E
10 60 10 60
Time sec. sec.
Within 15 minutes
sec.
sec.
A23903
DI-837
DIAGNOSTICS - ENGINE (2UZ-FE)
MONITOR STRATEGY
P2401 Vacuum pump stuck OFF
Related DTCs
R l t d DTC
P2402 Vacuum pump stuck ON
Required sensors/components Purge VSV and pump module
Frequency of operation Once per driving cycles
Duration Within 2 minutes (varies with amount of fuel in tank)
MIL operation 2 driving cycles
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever these
See page DI-437
DTCs are not present
Atmospheric pressure 70 to 110 kPa (525 to 825 mmHg)
Battery voltage 10.5 V -
Vehicle speed - 2.5 mph (4 km/h)
Ignition switch OFF
Time after key off 5 or 7 or 9.5 hours
EVAP pressure sensor malfunction
Not detected
(P0450, P0452, P0453)
EVAP canister purge valve Not operated by scan tool
EVAP canister vent valve Not operated by scan tool
EVAP leak detection pump Not operated by scan tool
Both of the following conditions 1 and 2
-
set before key off
1. Duration that vehicle has been driven 5 min. -
2. EVAP purge operation Performed
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