DTC P2146 [MZR-CD (RF Turbo)]


DTC P2146	Fuel injector No.1/No.4 circuit malfunction
DETECTION CONDITION	• The PCM monitors each cylinder injection confirmation signal from the IDM while the engine is running. If the PCM does not receive the injection confirmation signal for No.1 and No.4 cylinder normally, the PCM determines that the fuel injector No.1 and No.4 operation is not verified. Diagnostic support note • The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle. • FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	For the "Type A" and "Type B" specifications explained in the following, refer to "Specification Identification" to identify the service specification. (See SPECIFICATION IDENTIFICATION.) Type A • IDM malfunction • Connector or terminal malfunction • Short to GND in wiring harness between IDM terminal 1D and calibration resistor No.1 terminal D • Short to power supply in wiring harness between IDM terminal 1D and calibration resistor No.1 terminal D • Open circuit in wiring harness between IDM terminal 1D and calibration resistor No.1 terminal D • Short to GND in wiring harness between calibration resistor No.4 terminal D and IDM terminal 1D • Short to power supply in wiring harness between calibration resistor No.4 terminal D and IDM terminal 1D • Open circuit in wiring harness between calibration resistor No.4 terminal D and IDM terminal 1D • PCM malfunction Type B • IDM malfunction • Connector or terminal malfunction • Short to GND in wiring harness between IDM terminal 1D and fuel injector No.1 terminal A • Short to power supply in wiring harness between IDM terminal 1D and fuel injector No.1 terminal A • Open circuit in wiring harness between IDM terminal 1D and fuel injector No.1 terminal A • Short to GND in wiring harness between fuel injector No.4 terminal A and IDM terminal 1D • Short to power supply in wiring harness between fuel injector No.4 terminal A and IDM terminal 1D • Open circuit in wiring harness between fuel injector No.4 terminal A and IDM terminal 1D • PCM malfunction


STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Bulletins and/or on-line repair information availability. • Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT? • Connect the WDS or equivalent to the DLC-2. • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine. • Is the same DTC present?	Yes	Go to the next step.
3		No	Intermittent concern exists. Perform the "INTERMITTENT CONCERN TROUBLESHOOTING". (See INTERMITTENT CONCERN TROUBLESHOOTING [MZR-CD (RF Turbo)].)
4	INSPECT IDM CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • Inspect for poor connection (such as damaged/pulled-out terminals, corrosion). • Is there any malfunction?	Yes	Repair or replace the suspected terminal, then go to Step 9.
4		No	Go to the next step.
5	INSPECT IDM FOR SHORT TO GND • Turn the for engine switch off. • Inspect for continuity between IDM terminal 1D and body GND. • Is there continuity?	Yes	Repair or replace the wiring harness for a short to GND, then go to Step 9.
5		No	Go to the next step.
6	INSPECT IDM FOR SHORT TO POWER • Turn the engine switch off. • Inspect the voltage between IDM terminal 1D and body GND. • Is the voltage B+?	Yes	Repair or replace the wiring harness for a short to power supply, then go to Step 9.
6		No	Go to the next step.
7	INSPECT FOR OPEN CIRCUIT BETWEEN IDM AND FUEL INJECTOR NO.1/NO.4 • Turn the engine switch off. • Inspect for continuity between the following wiring harnesses: Type A - IDM terminal 1D and calibration resistor No.1 terminal D - IDM terminal 1D and calibration resistor No.4 terminal D Type B - IDM terminal 1D and fuel injector No.1 terminal A - IDM terminal 1D and fuel injector No.4 terminal A • Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness for an open circuit, then go to Step 9.
8	INSPECT IDM • Inspect the IDM. (See INJECTOR DRIVER MODULE (IDM) INSPECTION [MZR-CD (RF Turbo)].) • Is there any malfunction?	Yes	Replace the IDM, then go to step 9.
8		No	Go to the next step.
9	VERIFY TROUBLESHOOTING OF DTC P2146 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC using the WDS or equivalent. • Start the engine. • Is the same DTC present?	Yes	Replace the PCM, then go to the next step.
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the Repair Verification Drive Mode. (See OBD DRIVE MODE [MZR-CD (RF Turbo)].) • Are any DTCs present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE [MZR-CD (RF Turbo)].)
10		No	Troubleshooting completed.