Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 55

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–175

ES

HINT:
The correct waveform is as shown.

MONITOR DESCRIPTION

The ECM illuminates the MIL and sets a DTC when either one of the following conditions, which could 
cause emission deterioration, is detected (2 trip detection logic).
•

Within the first 1,000 crankshaft revolutions of the engine starting, an excessive misfiring rate 
(approximately 20 to 50 misfires per 1,000 crankshaft revolutions) occurs once.

Conditions

Idling

Items

Contents

GND

GND

100 msec./DIV. (Idling)

1 msec./DIV. (Idling)

Injection Duration

20 V/DIV.

20 V/DIV.

Injector Signal Waveform

Magnification

A121608E01

ECM

Camshaft position sensor

Crankshaft position sensor

(36-2 teeth)

A121609E01

ES–176

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

•

After the first 1,000 crankshaft revolutions, an excessive misfiring rate (approximately 20 to 50 misfires 
per 1,000 crankshaft revolutions) occurs 4 times in sequential crankshaft revolutions.

The ECM flashes the MIL and sets a DTC when either one of the following conditions, which could cause 
the Three-Way Catalytic Converter (TWC) damage, is detected (2 trip detection logic).
•

In every 200 crankshaft revolutions at a high engine rpm, the threshold misfiring percentage is 
recorded once.

•

In every 200 crankshaft revolutions at a normal engine rpm, the threshold misfiring percentage is 
recorded 3 times.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

Misfire:

Monitor period of emission-related-misfire:

Monitor period of catalyst-damaged-misfire (MIL blinks):

Related DTCs

P0300: Multiple cylinder misfire
P0301: Cylinder 1 misfire
P0302: Cylinder 2 misfire
P0303: Cylinder 3 misfire
P0304: Cylinder 4 misfire
P0305: Cylinder 5 misfire
P0306: Cylinder 6 misfire

Required Sensors/Components (Main)

Crankshaft position sensor and Camshaft position sensor

Required Sensors/Components (Related)

Engine coolant temperature and Intake air temperature sensors and 
Mass air flow meter

Frequency of Operation

Continuous

Duration

1,000 to 4,000 crankshaft revolutions: Emission related misfire
200 to 600 crankshaft revolutions: Catalyst damaged misfire

MIL Operation

2 driving cycles: Emission related misfire
MIL flashes immediately: Catalyst damaged misfire

Sequence of Operation

None

Monitor runs whenever following DTCs not present

P0100 - P0103 (MAF meter)
P0110 - P0113 (IAT sensor)
P0115 - P0118 (ECT sensor)
P0120 - P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for closed loop)
P0327 - P0333 (knock sensor)
P0335 (CKP sensor)
P0340 (CMP sensor)
P0500 (VSS)

Battery voltage

8 V or more

VVT system

Not operated by scan tool

Engine RPM

Manual Transmission: 450 to 5,400 rpm
Automatic Transmission: 400 to 5,400 rpm

Either of following conditions (a) or (b) met

-

(a) ECT at engine start

More than -7

°C (19°F)

(b) ECT

More than 20

°C (68°F)

Fuel cut

OFF

First 1,000 revolutions after engine start, or check mode

Crankshaft 1,000 revolutions

Except above

Crankshaft 1,000 revolutions x 4

All of following conditions 1, 2 and 3 met

Crankshaft 200 revolutions x 3

1. Driving cycles

1st

2. Check mode

OFF

3. Engine RPM

Less than 2,800 rpm

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–177

ES

TYPICAL MALFUNCTION THRESHOLDS

Monitor period of emission-related-misfire:

Monitor period of catalyst-damage-misfire (MIL blinks):

MONITOR RESULT

Refer to CHECKING MONITOR STATUS (See page 

ES-20

).

WIRING DIAGRAM

CONFIRMATION DRIVING PATTERN

(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the tester ON.

Except above

Crankshaft 200 revolutions

Misfire rate

2.9 % or more (Manual transmission)
2 % or more (Automatic transmission)

Number of misfires per 200 revolutions

77 or more (varies with intake air amount and RPM)

Paired cylinders misfire (MIL blinks immediately)

Detected

Battery

AM2

IG2

AM2

No. 1 Injector

No. 2 Injector

No. 3 Injector

No. 4 Injector

No. 5 Injector

No. 6 Injector

#10

#20

#30

#40

#50

#60

Ignition Switch

ECM

1

2

7

6

A1

B18

B9

B21

B10

B25

B11

2

2

1

2

1

2

1

2

1

2

1

2

1

B3

3

B3

4

B3

5

B3

6

B3

7

B3

A133415E02

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1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

(d) Record the DTC(s) and freeze frame data.
(e) Using the tester, switch the ECM from normal mode to check mode (See page 

ES-42

).

(f) Read the misfire counts of each cylinder (CYL #1 to #6) with the engine in an idling condition. If any 
misfire count is displayed, skip the following confirmation driving pattern.
(g) Drive the vehicle several times with the conditions, such as engine rpm and engine load, shown in 
MISFIRE RPM and MISFIRE LOAD in the DATA LIST.
HINT:
In order to store misfire DTCs, it is necessary to drive the vehicle for the period of time shown in the table 
below, with the MISFIRE RPM and MISFIRE LOAD in the DATA LIST.

(h) Check whether misfires have occurred by checking DTCs and freeze frame data.
HINT:
Do not turn the ignition switch OFF until the stored DTC(s) and freeze frame data have been recorded. 
When the ECM returns to normal mode (default), the stored DTC(s), freeze frame data and other data will 
be erased.
(i) Record the DTC(s), freeze frame data and misfire counts.
(j) Turn the ignition switch OFF and wait for at least 5 seconds.

INSPECTION PROCEDURE

HINT:
•

If any DTCs other than the misfire DTCs are output, troubleshoot those DTCs first.

•

Read freeze frame data using an intelligent tester. Freeze frame data record the engine conditions 
when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the 
vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or 
rich, and other data, from the time the malfunction occurred.

•

If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions 
stored in the freeze frame data.

•

The misfire still cannot be reproduced even though the conditions stored in the freeze frame data have 
been duplicated, one of the following factors is considered to be a possible cause of the problem:

(1) The fuel tank is low full.
(2) Improper fuel is used.
(3) The spark plugs have been contaminated.
(4) The problem is complex due to multiple factors.

•

After finishing repairs, check the misfire counts of the cylinders (CYL #1, #2, #3, #4, #5 and #6).

•

Be sure to confirm that no misfiring cylinder DTCs are set again by conducting the confirmation driving 
pattern, after repairs.

•

For 6 and 8 cylinder engines, the ECM intentionally does not set the specific misfiring cylinder DTCs at 
high engine RPM. If misfires occur only in high engine RPM areas, only DTC P0300 is set.
In the event of DTC P0300 being present, perform the following operations:

(1) Clear DTCs (See page 

ES-38

).

(2) Start the engine and conduct the confirmation driving pattern.
(3) Read the misfiring rates of each cylinder or DTC(s) using the tester.
(4) Repair the cylinder(s) that has a high misfiring rate or is indicated by the DTC.
(5) After finishing repairs, conduct the confirmation driving pattern again, in order to verify that DTC 
P0300 is not set.

•

When one of SHORT FT #1, LONG FT #1, SHORT FT #2 or LONG FT #2 in the freeze frame data is 
outside the range of +-20 %, the air-fuel ratio may be rich (-20 % or less) or lean (+20 % or more).

•

When the COOLANT TEMP in the freeze frame data is less than 75

°C (167°F), the misfires have 

occurred only while warming up the engine.

Engine RPM

Duration

Idling

3.5 minutes or more

1,000

3 minutes or more

2,000

1.5 minutes or more

3,000

1 minute or more