DTC P0203-00: Fuel Injector Circuit/Open Cylinder No. 3: Notes

DTC DETECTION DESCRIPTION

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/Snapshot data is available. DTC is stored in the PCM memory.
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 circuit in wiring harness between fuel injector relay terminal E and body ground Short to ground in wiring harness between the following terminals: Fuel injector relay terminal C-PCM terminal 1CO Fuel injector relay terminal C-PCM terminal 1CS Fuel injector relay terminal C-PCM terminal 1CW Fuel injector relay terminal C-PCM terminal 1DA Fuel injector relay terminal C-PCM terminal 1DG Fuel injector relay terminal C-PCM terminal 1DK Open circuit in wiring harness between the following terminals: Fuel injector relay terminal C-PCM terminal 1CO Fuel injector relay terminal C-PCM terminal 1CS Fuel injector relay terminal C-PCM terminal 1CW Fuel injector relay terminal C-PCM terminal 1DA Fuel injector relay terminal C-PCM terminal 1DG Fuel injector relay terminal C-PCM terminal 1DK PCM malfunction

Fig 1: PCM Circuit Diagram

Courtesy of MAZDA MOTORS CORP.