Dtc P0203 - Mazda 6 Workshop Manual

STEP
13 INSPECT FOR OPEN CIRCUIT BETWEEN IDM
AND PCM
• Turn the engine switch off.
• Inspect the continuity between IDM terminal 2F
(wiring harness-side) and PCM terminal 43
(wiring harness-side).
• Is there continuity?
14 VERIFY TROUBLESHOOTING OF DTC P0202
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC using the WDS or equivalent.
• Start the engine.
• Is the same DTC present?
15 VERIFY AFTER REPAIR PROCEDURE
• Perform the Repair Verification Drive Mode.
(See F2–39 OBD DRIVE
• Are any DTCs present?
End Of Sie

DTC P0203

DTC P0203 Fuel injector No.3 operation identified
• 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.
DETECTION
Diagnostic support note
CONDITION
• 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.
• 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
POSSIBLE
• Fuel injector No.3 malfunction
CAUSE
• 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
ON-BOARD DIAGNOSTIC
INSPECTION
MODE.)
Yes Go to the next step.
No Repair or replace the wiring harness for an open circuit,
then go to the next step.
Yes Replace the PCM, then go to the next step.
No Go to the next step.
Yes Go to the applicable DTC troubleshooting.
(See F2–40 DTC TABLE.)
No Troubleshooting completed.
ACTION
B6E407000200104
F2–101
F2