Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 65
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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MONITOR DESCRIPTION
The ECM uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to
monitor its efficiency.
The first sensor, the Air-Fuel Ratio (A/F) sensor, sends pre-catalyst information to the ECM. The second
sensor, the Heated Oxygen (HO2) sensor, sends post-catalyst information to the ECM.
In order to detect any deterioration in the TWC, the ECM calculates the Oxygen Storage Capacity (OSC)
of the TWC. This calculation is based on the voltage output of the HO2 sensor while performing active air-
fuel ratio control, rather than the conventional detecting method, which uses the locus ratio.
The OSC value is an indication of the oxygen storage capacity of the TWC. When the vehicle is being
driven with a warm engine, active air-fuel ratio control is performed for approximately 15 to 20 seconds.
When it is performed, the ECM deliberately sets the air-fuel ratio to lean or rich levels. If a rich-lean cycle
of the HO2 sensor is long, the OSC becomes greater. There is a direct correlation between the OSCs of
the HO2 sensor and the TWC.
The ECM uses the OSC value to determine the state of the TWC. If any deterioration has occurred, it
illuminates the MIL and sets a DTC.
HINT:
•
Bank 1 refers to the bank that includes cylinder No. 1.
•
Bank 2 refers to the bank that does not include cylinder No. 1.
•
Sensor 1 refers to the sensor closest to the engine assembly.
•
Sensor 2 refers to the sensor farthest away from the engine assembly.
MONITOR STRATEGY
DTC
P0420
Catalyst System Efficiency Below Threshold
(Bank 1)
DTC
P0430
Catalyst System Efficiency Below Threshold
(Bank 2)
DTC No.
DTC Detection Conditions
Trouble Areas
P0420
OSC value smaller than standard value under active air-fuel
ratio control (2 trip detection logic)
•
Gas leakage from exhaust system
•
A/F sensor (bank 1 sensor 1)
•
HO2 sensor (bank 1 sensor 2)
•
Exhaust manifold (TWC)
P0430
OSC value smaller than standard value under active air-fuel
ratio control (2 trip detection logic)
•
Gas leakage from exhaust system
•
A/F sensor (bank 2 sensor 1)
•
HO2 sensor (bank 2 sensor 2)
•
Exhaust manifold (TWC)
Related DTCs
P0420: Catalyst Deterioration
P0430: Catalyst Deterioration
Required Sensors/Components (Main)
A/F sensor and heated oxygen sensor
Required Sensors/Components (Related)
Intake air temperature sensor, mass air flow meter, crankshaft position sensor and
engine coolant temperature sensor
Frequency of Operation
Once per driving cycle
Duration
About 30 seconds
MIL Operation
2 driving cycles
Sequence of Operation
None
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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
MONITOR RESULT
Refer to CHECKING MONITOR STATUS (See page
).
CONFIRMATION DRIVING PATTERN
HINT:
Performing this confirmation pattern will activate the catalyst monitor. This is very useful for verifying the
completion of a repair.
Monitor runs whenever following DTCs not present
P0011 (VVT System 1 - Advance)
P0012 (VVT System 1 - Retard)
P0021 (VVT System 2 - Advance)
P0022 (VVT System 2 - Retard)
P0031, P0032, P0051, P0052 (A/F sensor heater - Sensor 1)
P0037, P0038, P0057, P0058 (HO2 sensor Heater - Sensor 2)
P0100 - P0103 (MAF meter)
P0115 - P0118 (ECT sensor)
P0120 - P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for closed loop)
P0136, P0156 (HO2 Sensor - Sensor 2)
P0171, P0172, P0174, P0175 (Fuel system)
P0300 - P0306 (Misfire)
P0335 (CKP sensor)
P0340 (CMP sensor)
P0351 - P0356 (Ignitor)
P0500 (VSS)
P2196, P2198 (A/F sensor - rationality)
P2A00, P2A03 (A/F sensor - slow response)
Battery voltage
11 V or more
IAT
-10
°C (14°F) or more
Engine coolant temperature sensor
75
°C (167°F) or more
Atmospheric pressure coefficient
76 kPa (570 mmHg) or more
Idling
OFF
Engine RPM
Less than 3,200 rpm
A/F sensor status
Activated
Fuel system status
Closed loop
Engine load
10 to 70 %
All of the following conditions are met
Condition 1, 2 and 3
1. Mass air flow rate
5 to 70 g/sec
2. Front catalyst temperature (estimated)
650 to 840
°C (1,202 to 1,544°F)
3. Rear catalyst temperature (estimated)
100 to 900
°C (212 to 1,652°F)
Rear HO2 sensor monitor
Completed
Shift position
4th or higher
Oxygen Storage Capacity (OSC) of Three-Way Catalytic Converter (TWC)
Less than 0.04 g
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the tester ON.
(d) Clear DTCs (where set) (See page
).
(e) Select the following menu items: DIAGNOSIS / CARB OBD II / READINESS TESTS.
(f) Check that CAT EVAL is INCMPL (incomplete).
(g) Start the engine and warm it up.
(h) Drive the vehicle at between 40 mph and 70 mph (64 km/h and 113 km/h) for at least 10 minutes.
(i) Note the state of the Readiness Tests items. Those items will change to COMPL (complete) as CAT
EVAL monitor operates.
(j) On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO /
PENDING CODES and check if any DTCs (any pending DTCs) are set.
HINT:
If CAT EVAL does not change to COMPL, and any pending DTCs fail to set, extend the driving time.
CONDITIONING FOR SENSOR TESTING
HINT:
Perform the operation with the engine speeds and time durations described below prior to checking the
waveforms of the A/F and HO2 sensors. This is in order to activate the sensors sufficiently to obtain the
appropriate inspection results.
Vehicle Speed
Ignition Switch OFF
Time
Idling
40 mph and 70 mph
Between
(64 km/h and 113 km/h)
(g)
(h)
Warm up
10 minutes
(Note: Even if vehicle stops during driving pattern, test can be resumed)
NOTICE:
This test will not be completed
if the vehicle is driven at
absolutely constant speed
such as with cruise control
activated.
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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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(a) Connect an intelligent tester to the DLC3.
(b) Start the engine and warm it up with all the accessories switched OFF, until the engine coolant
temperature stabilizes.
(c) Run the engine at an engine speed of between 2,500 rpm and 3,000 rpm for at least 3 minutes.
(d) While running the engine at 3,000 rpm for 2 seconds and 2,000 rpm for 2 seconds, check the
waveforms of the A/F and HO2 sensors using the tester.
HINT:
•
If either of the voltage outputs of the Air-Fuel Ratio (A/F) or Heated Oxygen (HO2) sensor does not
fluctuate, or either of the sensors makes a noise, the sensor may be malfunctioning.
•
If the voltage outputs of both the sensors remain lean or rich, the air-fuel ratio may be extremely lean or
rich. In such cases, perform the following A/F CONTROL using an intelligent tester.
•
If the Three-Way Catalytic Converter (TWC) has deteriorated, the HO2 sensor (located behind the
TWC) voltage output fluctuates up and down frequently, even under normal driving conditions (active
air-fuel ratio control is not performed).
(c)
Engine Speed
3,000 rpm
2,000 rpm
Idling
Ignition Switch OFF
(a)
(b)
(d)
(d)
Warming up
At least 3 minutes
2 seconds
Check
Time
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