Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 54

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–171

ES

WIRING DIAGRAM

M

Battery

AM2

EFI

AM2

IG2

IGN

Ignition Switch

EFI

ECM

MREL

C/OPN

Fuel Pump Resistor

FC

FPR

Fuel Pump

FUEL PUMP

1

3

2

5

1

3

2

5

3

1

5

2

4

1

2

4

5

L5

A13

30
B3

10

E47

8

E47

A1

6

7

2

1

2

1

A133414E02

ES–172

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES

INSPECTION PROCEDURE

HINT:
•

This DTC chart is on the premise that the engine is started normally. If the engine is difficult to start,
proceed to the problem symptoms table (See page

ES-28

).

•

Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition 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.

(a) Measure the voltage between the terminals of the B3

ECM connector.
Standard Voltage

NG

OK

(a) Remove the fuel pump relay from the engine room R/B.
(b) Check the fuel pump relay resistance.

Standard Resistance

(c) Reinstall the fuel pump relay.

NG

OK

1

CHECK ECM (FPR VOLTAGE)

E1 (-)

FPR (+)

ECM Connector

B3

A115970E09

Tester Connections

Conditions

Specified Conditions

FPR (B3-30) - E1 (B3-1)

STA signal ON

11 to 14 V

STA signal OFF

0 to 3 V

REPLACE ECM (See page

ES-446

)

2

INSPECT FUEL PUMP RELAY ASSEMBLY

A030519E02

Tester Connections

Specified Conditions

3 - 4

Below 1

Ω

3 - 5

10 k

Ω or higher

3 - 4

10 k

Ω or higher

(when battery voltage applied to terminals 1 and 2)

3 - 5

Below 1

Ω

(when battery voltage applied to terminals 1 and 2)

REPLACE FUEL PUMP RELAY ASSEMBLY

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–173

ES

(a) Remove the fuel pump relay from the engine room R/B.
(b) Disconnect the B3 ECM connector.
(c) Check the resistance.

Standard Resistance (Check for open)

Standard Resistance (Check for short)

(d) Reinstall the fuel pump relay.
(e) Reconnect the ECM connector.

NG

OK

3

CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - ECM)

1

4
2

5

3

B3

Fuel Pump Relay

Engine Room R/B:

ECM Connector

FPR

A133446E01

Tester Connections

Specified Conditions

Fuel pump relay (1) - FPR (B3-30)

Below 1

Ω

Tester Connections

Specified Conditions

Fuel pump relay (1) or FPR (B3-30) - Body ground

10 k

Ω or higher

REPAIR OR REPLACE HARNESS OR
CONNECTOR

REPLACE ECM (See page

ES-446

)

ES–174

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

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DESCRIPTION

When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely
high HC concentration levels can cause increase in exhaust emission levels. High concentrations of HC
can also cause increases in the Three-Way Catalytic Converter (TWC) temperature, which may cause
damage to the TWC. To prevent this increase in emissions and to limit the possibility of thermal damage,
the ECM monitors the misfire rate. When the temperature of the TWC reaches the point of thermal
degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the Camshaft Position
(CMP) sensor and the Crankshaft Position (CKP) sensor. The CMP sensor is used to identify any
misfiring cylinders and the CKP sensor is used to measure variations in the crankshaft rotation speed.
Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds.
If the misfire exceeds the threshold levels, and could cause emission deterioration, the ECM illuminates
the MIL and sets a DTC.

HINT:
When DTCs for misfiring cylinders are randomly set, but DTC P0300 is not set, it indicates that misfires
have been detected in different cylinders at different times. DTC P0300 is only set when several misfiring
cylinders are detected at the same time.
Reference: Inspection using an oscilloscope.
With the engine idling, check the waveform between terminals #10 to #60 and E1 of the ECM connectors.

DTC

P0300

Random / Multiple Cylinder Misfire Detected

DTC

P0301

Cylinder 1 Misfire Detected

DTC

P0302

Cylinder 2 Misfire Detected

DTC

P0303

Cylinder 3 Misfire Detected

DTC

P0304

Cylinder 4 Misfire Detected

DTC

P0305

Cylinder 5 Misfire Detected

DTC

P0306

Cylinder 6 Misfire Detected

DTC No.

DTC Detection Conditions

Trouble Areas

P0300

Simultaneous misfiring of several cylinders detected (2 trip
detection logic)

•

Open or short in engine wire harness

•

Connector connection

•

Vacuum hose connections

•

Ignition system

•

Injector

•

Fuel pressure

•

Mass Air Flow (MAF) meter

•

Engine Coolant Temperature (ECT) sensor

•

Compression pressure

•

Valve clearance

•

Valve timing

•

PCV valve and hose

•

PCV hose connections

•

Air induction system

•

ECM

P0301
P0302
P0303
P0304
P0305
P0306

Misfiring of specific cylinder detected (2 trip detection logic)

Items

Contents

Terminals

#10 to #60 - E01

Equipment Settings

20 V/Division,

100 or 1 msec./Division