The high speed activation of the high pressure fuel injector is possible through the high-voltage, rapid-recharge DC/DC converter. Using high pressure fuel, the atomized fuel's injection timing can be accurately controlled, which decreases emissions and fuel consumption. The steady ECM checks the injector driver movement. When the injector driver or inject has a malfunction, the injection control of the relevant cylinder is stopped or power to the injector relay is cut. Then the ECM illuminates the check engine warning light.

DTC No.	DTC Detection Condition	Trouble Area
P0200	NO INJF signals to ECM despite crankshaft rotating 10 times (1 trip detection logic) NO INJF signals to ECM despite crankshaft rotating 20 times during cranking (2 trip detection logic)	Open or short in Injector driver (EDU) circuit Injector driver (EDU) Fuel injector assembly ECM
P0201 P0202 P0203 P0204 P0205 P0206 P12FF	NO INJF signals of each cylinder to ECM 20 times successively (1 trip detection logic)	Open or short in Injector driver (EDU) circuit Injector driver (EDU) Fuel injector assembly ECM

WIRING DIAGRAM

Dtc P0200 Injector Circuit / Open. 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records 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 .

1.INSPECT INJECTOR DRIVER (POWER SOURCE OF EDU)

Dtc P0200 Injector Circuit / Open. 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the E58 injector driver (EDU) connector.

Turn the engine switch on (IG).

Measure the voltage of the injector driver (EDU) connector.

Standard voltage:
Tester Connection Specified Condition
+B (E58-1) - Engine ground 10 to 14 V
+B2 (E58-2) - Engine ground 10 to 14 V

Reconnect the injector driver (EDU) connector.

Go to step 6

OK

3.CHECK HARNESS AND CONNECTOR (ECM - EDU)

Disconnect the E3, E5 and E6 connectors.

Disconnect the E58 injector driver (EDU) connector.

Measure the resistance of the wire harness side connectors.

Standard resistance (Check for open):

Tester Connection	Specified Condition
#10 (E3-15) - #10 (E58-3)	Below 1 Ω
#20 (E5-17) - #20 (E58-2)	Below 1 Ω
#30 (E3-14) - #30 (E58-1)	Below 1 Ω
#40 (E5-16) - #40 (E58-12)	Below 1 Ω
#50 (E3-13) - #50 (E58-11)	Below 1 Ω
#60 (E5-15) - #60 (E58-10)	Below 1 Ω
INJF (E6-26) - INJF (E58-9)	Below 1 Ω

Standard resistance (Check for short):

Tester Connection	Specified Condition
#10 (E3-15) or #10 (E58-3) - Engine ground	10 kΩ or higher
#20 (E5-17) or #20 (E58-2) - Engine ground	10 kΩ or higher
#30 (E3-14) or #30 (E58-1) - Engine ground	10 kΩ or higher
#40 (E5-16) or #40 (E58-12) - Engine ground	10 kΩ or higher
#50 (E3-13) or #50 (E58-11) - Engine ground	10 kΩ or higher
#60 (E5-15) or #60 (E58-10) - Engine ground	10 kΩ or higher
INJF (E6-26) or INJF (E58-9) - Engine ground	10 kΩ or higher

Reconnect the ECM connector.

Reconnect the injector driver (EDU) connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.CHECK ECM (#10, #20, #30, #40, #50 AND #60 VOLTAGE)

Connect an oscilloscope to terminals #10 to #60 and E1 of the E3, E4 and E5 ECM harness side connectors.

With the engine cranking or idling, check the signal waveform.

Standard:
Signal waveform appears as shown in the illustration.

ECM Terminal Name	CH1: #10 (E3-15) - E1 (E4-7) CH1: #20 (E5-17) - E1 (E4-7) CH1: #30 (E3-14) - E1 (E4-7) CH1: #40 (E5-16) - E1 (E4-7) CH1: #50 (E3-13) - E1 (E4-7) CH1: #60 (E5-15) - E1 (E4-7)
Tester Range	20 V/DIV., 20 ms./DIV.
Condition	Idling after warming up engine

HINT:

Check the waveform before the ECM detects the DTC(s) and enters the fail-safe mode, because the ECM will no more indicate the output voltage once it enters the fail-safe mode.

REPLACE ECM

OK

5.CHECK ECM (INJF VOLTAGE)

Connect an oscilloscope to terminals INJF and E1 of the E6 and E7 ECM harness side connectors.

With the engine cranking or idling, check the signal waveform.

Standard voltage:
Signal waveform appears as shown in the illustration.

ECM Terminal Name	CH2: INJF (E6-26) - E1 (E4-7)
Tester Range	20 V/DIV., 20 ms./DIV.
Condition	Idling after warming up engine

HINT:

Check the waveform before the ECM detects the DTC(s) and enters the fail-safe mode, because the injector driver (EDU) will no more indicate the output voltage once it enters the fail-safe mode.

REPLACE INJECTOR DRIVER

CHECK FOR INTERMITTENT PROBLEMS

6.INSPECT FUEL INJECTOR (RESISTANCE)

Check the resistance of the fuel injector .

REPLACE FUEL INJECTOR

REPAIR OR REPLACE HARNESS OR CONNECTOR

LEXUS IS250, IS220d / GSE20 ALE20

4GR-FSE ENGINE CONTROL SYSTEM

Lexus IS250 IS220d GSE20 ALE20

SFI SYSTEM