DTC P0203 [MZR-CD (RF Turbo)]


DTC P0203	Fuel injector No.3 operation identified
DETECTION CONDITION	• The PCM monitors each cylinder's injection confirmation signal from the IDM while the engine is running. If the PCM does not receive the injection confirmation signal for No.3 cylinder normally, the PCM determines that the fuel injector No.3 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 2D and PCM terminal 44 • Short to power supply in wiring harness between IDM terminal 2D and PCM terminal 44 • Open circuit in wiring harness between IDM terminal 2D and PCM terminal 44 • Fuel injector No.3 malfunction • Short to GND in wiring harness between calibration resistor No.3 terminal B and IDM terminal 1H • Short to power supply in wiring harness between calibration resistor No.3 terminal B and IDM terminal 1H • Open circuit in wiring harness between calibration resistor No.3 terminal B and IDM terminal 1H • PCM malfunction Type B • IDM malfunction • Connector or terminal malfunction • Short to GND in wiring harness between IDM terminal 2D and PCM terminal 44 • Short to power supply in wiring harness between IDM terminal 2D and PCM terminal 44 • Open circuit in wiring harness between IDM terminal 2D and PCM terminal 44 • Fuel injector No.3 malfunction • Short to GND in wiring harness between fuel injector No.3 terminal B and IDM terminal 1H • Short to power supply in wiring harness between fuel injector No.3 terminal B and IDM terminal 1H • Open circuit in wiring harness between fuel injector No.3 terminal B and IDM terminal 1H • 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	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA • Is DTC P0203 on the FREEZE FRAME DATA?	Yes	Go to the next step.
4		No	Go to the troubleshooting procedures for the DTC in the FREEZE FRAME DATA.
5	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 14.
5		No	Go to the next step.
6	INSPECT IDM FOR SHORT TO GND • Turn the engine switch off. • Inspect the continuity between the following terminals and body GND: - IDM terminal 2D (wiring harness-side) - IDM terminal 1H (wiring harness-side) • Is there continuity?	Yes	Repair or replace the wiring harness for a short to GND, then go to Step 14.
6		No	Go to the next step.
7	INSPECT IDM FOR SHORT TO POWER • Turn the engine switch to the ON position (Engine off). • Inspect the voltage between the following terminals and body GND: - IDM terminal 2D (wiring harness-side) - IDM terminal 1H (wiring harness-side) • Is voltage B+?	Yes	Repair or replace the wiring harness for a short to power supply, then go to Step 14.
7		No	Go to the next step.
8	INSPECT FUEL INJECTOR NO.3 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 14.
8		No	Go to the next step.
9	INSPECT FOR OPEN CIRCUIT BETWEEN IDM AND FUEL INJECTOR NO.3 • Turn the engine switch off. • Inspect for continuity between the following terminals: Type A - IDM terminal 1H (wiring harness-side) and calibration resistor No.3 terminal B (wiring harness-side). Type B - IDM terminal 1H (wiring harness-side) and fuel injector No.3 terminal B (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
9		No	Repair or replace the wiring harness for an open circuit, then go to Step 14.
10	INSPECT FUEL INJECTOR • Inspect the fuel injector No.3. (See FUEL INJECTOR INSPECTION [MZR-CD (RF Turbo)].) • Is there any malfunction?	Yes	Replace fuel injector No.3, then go to Step 14.
10		No	Go to the next step.
11	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 14.
11		No	Go to the next step.
12	INSPECT PCM 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 14.
12		No	Go to the next step.
13	INSPECT FOR OPEN CIRCUIT BETWEEN IDM AND PCM • Turn the engine switch off. • Inspect for continuity between IDM terminal 2D (wiring harness-side) and PCM terminal 44 (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
13		No	Repair or replace the wiring harness for an open circuit, then go to the next step.
14	VERIFY TROUBLESHOOTING OF DTC P0203 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.
14		No	Go to the next step.
15	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)].)
15		No	Troubleshooting completed.