Lexus IS250 · Service Manual ENGINE

P0200

Diagnostic trouble codes

DESCRIPTION

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

WIRING DIAGRAM

A117878E02
A117879E01

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 (Click here).


1. INSPECT INJECTOR DRIVER (POWER SOURCE OF EDU)

  1. A117843E02
    Disconnect the E58 injector driver (EDU) connector.

  1. Turn the engine switch on (IG).

  1. 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

  1. Reconnect the injector driver (EDU) connector.



 NG
CHECK EDU (POWER SOURCE CIRCUIT)
OK


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

  1. A108925E07
    Disconnect the N1 and I1 connectors.

  1. Measure the resistance of the injector driver (EDU) connector.

    Standard resistance:
    Tester Connection
    		 Condition
    		 Specified Condition
    IJ1+ (H1-2) - IJ1- (H1-5)
    		 20°C (68°F)
    		 2.01 to 2.31 Ω
    IJ2+ (I1-3) - IJ2- (I1-6)
    		 20°C (68°F)
    		 2.01 to 2.31 Ω
    IJ3+ (H1-3) - IJ3- (H1-6)
    		 20°C (68°F)
    		 2.01 to 2.31 Ω
    IJ4+ (I1-1) - IJ4- (I1-4)
    		 20°C (68°F)
    		 2.01 to 2.31 Ω
    IJ5+ (H1-1) - IJ5- (H1-4)
    		 20°C (68°F)
    		 2.01 to 2.31 Ω
    IJ6+ (I1-2) - IJ6- (I1-5)
    		 20°C (68°F)
    		 2.01 to 2.31 Ω

  1. Reconnect the injector driver (EDU) connector.



 NG
Go to step 6
OK


3. CHECK HARNESS AND CONNECTOR (ECM - EDU)

  1. A108926E09
    Disconnect the E3, E5 and E6 connectors.

  1. Disconnect the E58 injector driver (EDU) connector.

  1. 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

  1. Reconnect the ECM connector.

  1. Reconnect the injector driver (EDU) connector.



 NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. A122766E05
    Connect an oscilloscope to terminals #10 to #60 and E1 of the E3, E4 and E5 ECM harness side connectors.

  1. 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.



 NG
REPLACE ECM
OK


5. CHECK ECM (INJF VOLTAGE)

  1. A122766E04
    Connect an oscilloscope to terminals INJF and E1 of the E6 and E7 ECM harness side connectors.

  1. 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.



 NG
REPLACE INJECTOR DRIVER
OK

CHECK FOR INTERMITTENT PROBLEMS

6. INSPECT FUEL INJECTOR (RESISTANCE)

  1. Check the resistance of the fuel injector (Click here).



NG
REPLACE FUEL INJECTOR
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR


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