3Gr-Fse Engine Control System. Dtc P0200 Injector Circuit / Open

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 (EDU) movement. When the injector driver (EDU) or inject has a malfunction, the injection control of the relevant cylinder is stopped or power to the INJ relay is cut. Then the ECM illuminates the MIL. 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 (EDU) movement. When the injector driver (EDU) or inject has a malfunction, the injection control of the relevant cylinder is stopped or power to the INJ relay is cut. Then the ECM illuminates the MIL.

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 EDU circuit EDU (Injector driver) 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 EDU circuit EDU (Injector driver) Fuel injector assembly ECM

WIRING DIAGRAM

Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System.
Dtc
P0200 Injector Circuit / Open

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)

Disconnect the E52 EDU connector.

Turn the engine switch on (IG).

Measure the voltage between the specified terminals of the EDU connector.
Standard voltage:
Tester Connection
Specified Condition
+B (E52-1) - Body ground
9 to 14 V
+B2 (E52-2) - Body ground
9 to 14 V

Reconnect the EDU connector.

CHECK EDU POWER SOURCE CIRCUIT

OK

2.CHECK HARNESS AND CONNECTOR (EDU - FUEL INJECTOR)

Disconnect the I1 and J1 connectors.

Measure the resistance between the specified terminals of the EDU connector.

Standard resistance:

Tester Connection	Specified Condition
IJ1+ (I1-2) - IJ1- (I1-5)	2.01 to 2.31 Ω at 20°C (68°F)
IJ2+ (J1-3) - IJ2- (J1-6)	2.01 to 2.31 Ω at 20°C (68°F)
IJ3+ (I1-3) - IJ3- (I1-6)	2.01 to 2.31 Ω at 20°C (68°F)
IJ4+ (J1-1) - IJ4- (J1-4)	2.01 to 2.31 Ω at 20°C (68°F)
IJ5+ (I1-1) - IJ5- (I1-4)	2.01 to 2.31 Ω at 20°C (68°F)
IJ6+ (J1-2) - IJ6- (J1-5)	2.01 to 2.31 Ω at 20°C (68°F)

Reconnect the EDU connector.

Go to step 6

OK

3.CHECK HARNESS AND CONNECTOR (ECM - EDU)

Disconnect the E6, E8 and E45 ECM connectors.

Disconnect the E51 EDU connector.

Measure the resistance between the wire harness side connectors.

Standard resistance (Check for open):

Tester Connection	Specified Condition
#10 (E8-15) - #10 (E51-3)	Below 1 Ω
#20 (E6-17) - #20 (E51-2)	Below 1 Ω
#30 (E8-14) - #30 (E51-1)	Below 1 Ω
#40 (E6-16) - #40 (E51-12)	Below 1 Ω
#50 (E8-13) - #50 (E51-11)	Below 1 Ω
#60 (E6-15) - #60 (E51-10)	Below 1 Ω
INJF (E45-26) - INJF (E51-9)	Below 1 Ω

Standard resistance (Check for short):

Tester Connection	Specified Condition
#10 (E8-15) or #10 (E51-3) - Body ground	10 kΩ or higher
#20 (E6-17) or #20 (E51-2) - Body ground	10 kΩ or higher
#30 (E8-14) or #30 (E51-1) - Body ground	10 kΩ or higher
#40 (E6-16) or #40 (E51-12) - Body ground	10 kΩ or higher
#50 (E8-13) or #50 (E51-11) - Body ground	10 kΩ or higher
#60 (E6-15) or #60 (E51-10) - Body ground	10 kΩ or higher
INJF (E45-26) or INJF (E51-9) - Body ground	10 kΩ or higher

Reconnect the ECM connector.

Reconnect the 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 E6, E7 and E8 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	CH1: #10 (E8-15) - E1 (E7-7) CH1: #20 (E6-17) - E1 (E7-7) CH1: #30 (E8-14) - E1 (E7-7) CH1: #40 (E6-16) - E1 (E7-7) CH1: #50 (E8-13) - E1 (E7-7) CH1: #60 (E6-15) - E1 (E7-7)
Tester Range	20 V/DIV., 20 msec./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 E7 and E45 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 (E45-26) - E1 (E7-7)
Tester Range
20 V/DIV., 20 msec./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 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 ASSEMBLY

REPLACE FUEL INJECTOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Tester Connection	Specified Condition
+B (E52-1) - Body ground	9 to 14 V
+B2 (E52-2) - Body ground	9 to 14 V

ECM Terminal Name	CH2: INJF (E45-26) - E1 (E7-7)
Tester Range	20 V/DIV., 20 msec./DIV.
Condition	Idling after warming up engine