P12FF
4GR-FSE ENGINE CONTROL: SFI SYSTEM: P0200-P0206, P12FF: Injector Circuit / Open
P12FF - Electric Driver Unit
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 injector 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 MIL and sets a DTC.
MONITOR DESCRIPTION
The injector driver sends the injector injection confirmation signal (INJF) to the engine control module (ECM). Using this signal, the ECM monitors the fuel injector operation. If the ECM receives no INJF signal in 20 consecutive crankshaft rotations, the ECM illuminates the MIL and sets a DTC immediately. Then, the ECM aborts the fuel injection of the appropriate cylinder, or turns off the injector relay to shut the injector driver power source.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) Reading and Clearing Diagnostic Trouble Codes.
4. Turn the engine switch off and wait for at least 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine.
7. Idle the engine for 15 seconds or more [B].
8. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
9. Enter the following menus: Powertrain / Engine / Trouble Codes [C].
10. Read Pending DTCs.
HINT
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
11. Input the DTC: P0200, P0201, P0202, P0203, P0204, P0205, P0206 or P12FF.
12. Check the DTC judgment result.
HINT
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] and [C] again.
13. If no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.
HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT
Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.
PROCEDURE
1. CLEAR DTC
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn the Techstream on.
(c) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
NEXT -- Continue to next step.
2. INSPECT INJECTOR DRIVER (POWER SOURCE OF EDU)
(a) Disconnect the injector driver (EDU) connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
(d) Reconnect the injector driver (EDU) connector.
NG -- INSPECT INTEGRATION RELAY (INJ RELAY)
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (INJECTOR DRIVER - FUEL INJECTOR)
(a) Disconnect the injector driver (EDU) connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) Reconnect the injector driver (EDU) connectors.
NG -- CHECK FUEL INJECTOR ASSEMBLY (RESISTANCE)
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (ECM - INJECTOR DRIVER)
(a) Disconnect the ECM connectors.
(b) Disconnect the injector driver (EDU) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
Standard Resistance (Check for Short):
(d) Reconnect the ECM connectors.
(e) Reconnect the injector driver (EDU) connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. CHECK ECM (#10, #20, #30, #40, #50 AND #60 VOLTAGE)
(a) Connect an oscilloscope to terminals #10 to #60 and E1 of the E5, E4 and E3 ECM harness side connectors.
(b) With the engine cranking or idling, check the signal waveform.
Standard:
Signal waveform appears as shown in the illustration.
HINT
Check the waveform before the ECM detects the DTC(s) and enters the fail-safe mode, because the ECM will not indicate the output voltage any more once it enters the fail-safe mode.
NG -- REPLACE ECM Removal
OK -- Continue to next step.
6. CHECK ECM (INJF VOLTAGE)
(a) Connect an oscilloscope to terminals INJF and E1 of the E4 and E6 ECM harness side connectors.
(b) With the engine cranking or idling, check the signal waveform.
Standard:
Signal waveform appears as shown in the illustration.
HINT
Check the waveform before the ECM detects the DTC(s) and enters the fail-safe mode, because the injector driver (EDU) will not indicate the output voltage any more once it enters the fail-safe mode.
NG -- REPLACE INJECTOR DRIVER Removal
OK -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems
7. CHECK FUEL INJECTOR ASSEMBLY (RESISTANCE)
(a) Check the resistance of the fuel injector Testing and Inspection.
NG -- REPLACE FUEL INJECTOR Removal
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (INJECTOR DRIVER - FUEL INJECTOR)
8. INSPECT INTEGRATION RELAY (INJ RELAY)
(a) Inspect the INJ relay Integration Relay.
NG -- REPLACE INTEGRATION RELAY (INJ RELAY) Removal
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (INJ RELAY - INJECTOR DRIVER)
(a) Disconnect the integration relay connector.
(b) Disconnect the injector driver (EDU) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
Standard Resistance (Check for Short):
(d) Reconnect the integration relay connector.
(e) Reconnect the injector driver (EDU) connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (INJ RELAY - ECM)
(a) Disconnect the integration relay connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
Standard Resistance (Check for Short):
(d) Reconnect the integration relay connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM Removal