Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 82

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–283

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DESCRIPTION

This vehicle is equipped with a voltage inverter, which supplies power to various electrical appliances. 
When the main switch of the voltage inverter is turned ON, the inverter relay turns ON, and the inverter 
then converts the 12 V Direct Current (DC) of the battery into an 115 V Alternating Current (AC). The 
voltage inverter can output a maximum of 400 W from an outlet.
When the AC 115 V is output, a load is applied to the engine. The ECM controls the engine idling speed 
according to the vehicle speed and engine load. A speed signal is input to the inverter and an idle-up 
signal is transmitted to the ECM.

MONITOR DESCRIPTION

While the engine is idling, the ECM performs idle-up according to the power supply of the inverter to 
stabilize the engine idling speed.

DTC

P1500

AC Inverter Malfunction

DTC No.

DTC Detection Conditions

Trouble Areas

P1500

While vehicle running, idle-up signal input to ECM for 10 
seconds
(2 trip detection logic)

•

Open or short in speed signal circuit

•

Short between idle-up signal and +B circuits

•

Voltage inverter

•

ECM

Battery

AC 115 V

A/C 115 V 
Power Outlet 
Socket

From:

Park/ Neutral Position Switch

(For Automatic Transmission)

STA Fuse
(For Manual Transmission)

Ignition 
Switch

Main Switch

Voltage Inverter

Combination Meter

ECM

SPD

ELS2

Speed 
Signal

Idle-up Signal

SPD

EXCD

+B

A133425E01

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1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

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When the vehicle is stationary and the inverter input exceeds 8.3 A, the inverter sends an idle-up signal 
from the EXCD terminal of the inverter to the ELS2 terminal of the ECM.
If the idle-up signal is input into the ECM for 10 seconds while the vehicle is running, the ECM interprets 
this as a malfunction in the inverter circuit and sets the DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

WIRING DIAGRAM

Related DTCs

P1500: Voltage inverter performance

Required Sensors/Components (Main)

Voltage inverter

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

10 seconds

MIL Operation

2 driving cycles

Sequence of Operation

None

Monitor runs whenever following DTCs not present

None

Vehicle speed

3.11 mph (5 km/h) or more

Battery voltage

8 V or more

Ignition switch

ON

Starter

OFF

Electric load signal 2

ON

E13
Combination Meter

K6
Voltage Inverter

+S

SPD

ELS2

SPD

ECM

EXCD

14

9

2

12

E46

8

E46

A133426E01

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

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INSPECTION PROCEDURE

(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Select the following menu items: DIAGNOSIS / 

ENHANCED OBD II / DTC INFO / CURRENT CODES.

(d) Read DTCs.

Result

HINT:
If any DTCs other than P1500 are output, troubleshoot 
those DTCs first.

NG

OK

(a) Shift the transmission gear selector lever to the neutral 

position.

(b) Jack up the vehicle.
(c) Turn the ignition switch ON.
(d) Check the voltage between the terminals of the ECM 

connectors as the wheel is turned slowly.
Standard Voltage

HINT:
The output voltage should fluctuate up and down 
similarly to the diagram on the left when the wheel is 
turned slowly.

NG

OK

1

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1500)

Display (DTC Output)

Proceed To

P1500

A

P1500 and other DTCs

B

GO TO DTC CHART (See page 

ES-57

)

2

INSPECT VOLTAGE INVERTER ASSEMBLY (SPD SIGNAL)

ECM Connector

B3

E46

E1 (-)

SPD (+)

12 V

0 V

Turn Wheel

A116298E02

Tester Connections

Specified Conditions

SPD (E46-8) - E1 (B3-1)

Voltage generated intermittently

REPAIR OR REPLACE HARNESS OR 
CONNECTOR

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1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

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(a) Disconnect the K6 inverter connector.
(b) Start the engine.
(c) Measure the voltage between the OUT terminal of 

inverter and the body ground.
Standard Voltage

(d) Reconnect the inverter connector.

OK

NG

(a) Disconnect the K6 inverter connector.
(b) Disconnect the E46 ECM connector.
(c) Turn the ignition switch ON.
(d) Measure the voltage between the terminals of the wire 

harness side connectors and body ground.
Standard Voltage (Check for short in idling up signal 
circuit)

(e) Reconnect the inverter connector and the ECM 

connector.

NG

OK

3

INSPECT ECM

Voltage Inverter Assembly

EXCD

K6

G035001E04

Tester Connections

Specified Conditions

EXCD (K6-9) - Body ground

1 V or less

REPLACE VOLTAGE INVERTER ASSEMBLY 
(See page 

OT-17

)

4

CHECK HARNESS AND CONNECTOR (ECM - INVERTER, INVERTER - POWER SOURCE)

E46

ECM Connector

K6

ELS2

EXCD

Voltage Inverter Assembly

A116301E03

Tester Connections

Specified Conditions

EXCD (K6-9) - Body ground

1 V or less

ELS2 (E46-12) - Body ground

REPAIR OR REPLACE HARNESS OR 
CONNECTOR

REPLACE ECM (See page 

ES-446

)