DTC P0203; Pcm: Notes
WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
DETECTION CONDITION & POSSIBLE CAUSE
| DTC P0203:00 |
Fuel injector circuit/open cylinder No. 3 |
| DETECTION CONDITION |
- If the fuel injection verification signal is not input at 25 times continuously even though the PCM drives the fuel injector No. 3, the PCM determines that there is an open circuit in the fuel injector No. 3 control circuit.
MONITORING CONDITIONS
- The following conditions are met:
- Battery voltage: 10.5 V or more
- Fuel injection control: except during fuel cut
Diagnostic support note
- This is a continuous monitor (CCM).
- The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.
- FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
- DTC is stored in the PCM memory.
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| FAIL-SAFE FUNCTION |
Not applicable |
| POSSIBLE CAUSE |
- Fuel injector No. 3 connector or terminals malfunction
- PCM connector or terminals malfunction
- Short to ground in wiring harness between the following terminals:
- Fuel injector No. 3 terminal B-PCM terminal 1EB
- Fuel injector No. 3 terminal A-PCM terminal 1EA
- Short to power supply in wiring harness between fuel injector No. 3 terminal A and PCM terminal 1EA
- Open circuit in wiring harness between the following terminals:
- Fuel injector No. 3 terminal B-PCM terminal 1EB
- Fuel injector No. 3 terminal A-PCM terminal 1EA
- Fuel injector No. 3 malfunction
- Fuel injector relay malfunction
- Open or short to ground in wiring harness between fuel injector relay and PCM
- PCM malfunction
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