Toyota Tundra 2005 Service - Repair - Maintenance page 496

TYPICAL ENABLING CONDITIONS
It Item
The monitor will run whenever these
DTCs are not present
Battery voltage
IAT
ECT
Atmospheric pressure coefficient
Idle
Engine RPM
A/F sensor
Fuel system status
Engine load
All of the following conditions are met
1. MAF
2. Front catalyst temperature (estimated)
3. Rear catalyst temperature (estimated)
Rear HO2S monitor
Shift position
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria
Oxygen storage capacity (OSC) of catalyst
MONITOR RESULT
Refer to page DI−26
The test value and test limit information are described as shown in the following table. Check the monitor
result and test values after performing the monitor drive pattern (see page DI−27).
S
TID (Test Identification Data) is assigned to each emissions−related component.
S
TLT (Test Limit Type):
If TLT is 0, the component is malfunctioning when the test value is higher than the test limit.
If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
S
CID (Component Identification Data) is assigned to each test value.
S
Unit Conversion is used to calculate the test value indicated on generic OBD ll scan tools.
TID $01: Catalyst (Active A/F control method)
TLT CID
Multiply by 0.0078
1 $01
(no dimension)
Multiply by 0.0078
1 $02
(no dimension)
DIAGNOSTICS
for detailed information.
Unit Conversion
Oxygen storage capacity (bank 1):
Calculated by HO2S 2 output
Oxygen storage capacity (bank 2):
Calculated by HO2S 2 output
− ENGINE (1GR−FE)
Specification
Minimum
See page
11 V
−10_C (14_F)
75°C (167°F)
0.75
−
Activated
Closed loop
10 to 70 %
Condition 1, 2 and 3
5 to 70 g/sec
650 to 840_C (1,202 to 1,544_F)
100 to 900_C (212 to 1,652_F)
Completed
4th
Description of Test Data
Maximum
DI−18
−
−
−
−
OFF
3,200 rpm
−
Threshold
Less than 0.04
Description of Test Limit
Malfunction criteria for catalyst deterioration
Malfunction criteria for catalyst deterioration
DI−229