Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 78

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

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WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:
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) Remove the EFI fuse from the engine room R/B.
(b) Check the EFI fuse resistance.

Standard Resistance:

Below 1 

Ω

(c) Reinstall the EFI fuse.

NG

OK

1

CHECK FUSE (EFI FUSE)

EFI

Battery

ECM

BATT

E1

2

1

3

E47

1

B3

A133422E01

EFI Fuse

Engine Room R/B:

A133436E01

CHECK FOR SHORT IN ALL HARNESSES 
AND CONNECTORS CONNECTED TO FUSE 
AND REPLACE FUSE

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1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

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

and E47 ECM connectors.
Standard Voltage

NG

OK

(a) Check the harness and the connector between the EFI 

fuse and ECM.
(1) Remove the EFI fuse from the engine room R/B.
(2) Disconnect the E47 ECM connector.
(3) Check the resistance.

Standard Resistance (Check for open)

Standard Resistance (Check for short)

(4) Reconnect the ECM connector.
(5) Reinstall the EFI fuse.

(b) Check the harness and the connector between the EFI 

fuse and battery.
(1) Remove the EFI fuse from the engine room R/B.
(2) Disconnect the positive battery terminal.
(3) Check the resistance.

Standard Resistance (Check for open)

Standard Resistance (Check for short)

(4) Reconnect the positive battery terminal.
(5) Reinstall the EFI fuse.

2

INSPECT ECM (BATT VOLTAGE)

B3

E47

E1 (-) BATT (+)

ECM Connector

G100798E11

Tester Connections

Specified Conditions

BATT (E47-3) - E1 (B3-1)

11 to 14 V

              Go to step 3

REPLACE ECM (See page 

ES-446

)

3

CHECK HARNESS AND CONNECTOR (ECM - EFI FUSE, EFI FUSE - BATTERY)

1

2

EFI  Fuse

Engine Room R/B:

ECM Connector

BATT

E47

A133447E01

Tester Connections

Specified Conditions

EFI fuse (2) - BATT (E47-3)

Below 1 

Ω

Tester Connections

Specified Conditions

EFI fuse (2) or BATT (E47-3) - Body ground

10 k

Ω or higher

Tester Connections

Specified Conditions

Battery positive terminal - EFI fuse (1)

Below 1 

Ω

Tester Connections

Specified Conditions

Battery positive terminal or EFI fuse (1) - Body 

ground

10 k

Ω or higher

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

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NG

OK

(a) Check that the battery is not depleted.

OK:

Battery is not depleted.

NG

OK

REPAIR OR REPLACE HARNESS OR 
CONNECTOR

4

INSPECT BATTERY

REPLACE BATTERY

CHECK AND REPLACE ENGINE ROOM RELAY BLOCK

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1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

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DESCRIPTION

The ECM continuously monitors its own internal memory status, internal circuits, and output signals 
transmitted to the throttle actuator. This self-check insures that the ECM is functioning properly. If any 
malfunction is detected, the ECM sets the appropriate DTC and illuminates the MIL.
The ECM memory status is diagnosed by internal mirroring of the main CPU and the sub CPU to detect 
Random Access Memory (RAM) errors. The two CPUs also perform continuous mutual monitoring. The 
ECM illuminates the MIL and sets a DTC if: 1) outputs from the two CPUs are different or deviate from the 
standards, 2) the signals sent to the throttle actuator deviate from the standards, 3) a malfunction is found 
in the throttle actuator supply voltage, and 4) any other ECM malfunction is found.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

ECM RAM errors (P0604):

ECM CPU range check (P0606):

DTC

P0604

Internal Control Module Random Access Mem-
ory (RAM) Error

DTC

P0606

ECM / PCM Processor

DTC

P0607

Control Module Performance

DTC

P0657

Actuator Supply Voltage Circuit / Open

DTC No.

DTC Detection Conditions

Trouble Areas

P0604
P0606
P0607
P0657

ECM internal error (1 trip detection logic)

ECM

Related DTCs

P0604: ECM RAM error
P0606: ECM range check
P0607: ECM CPU malfunction
P0657: ETCS power supply

Required Sensors/Components (Main)

ECM

Required Sensors/Components (Related)

-

Frequency of Operation

Once per driving cycle: P0657
Continuous: P0604, P0606, P0607

Duration

P0604: 6 times or more
P0606, P0607 and P0657: Within 1 second

MIL Operation

Immediate

Sequence of Operation

None

Monitor runs whenever following DTCs not present

None

RAM mirror check

fail

Either of following conditions met:

-

Difference between throttle valve position of main CPU and throttle valve position of sub CPU

0.3 V or more

Difference between accelerator pedal position of main CPU and accelerator pedal position of sub CPU

0.3 V or more