Diagnostic Procedures
- If QUICK TEST was not performed, go to QUICK TEST under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed, go to next step.NOTE: Electronic ignition engine timing is entirely controlled by the PCM. Electronic ignition timing is NOT adjustable. Do not attempt to check base timing. You will receive false readings.
- Determine Which Coil Is Not Firing
Determine which coil is not firing using information from IGNITION COIL-TO-CYLINDER CORRELATION (COIL PACK) table. Record cylinder, coil and breakout box terminal from table. If cylinder number, coil driver and PCM pin numbers have been recorded, go to next step. If information has not been recorded, obtain required information. Go to next step.IGNITION COIL-TO-CYLINDER CORRELATION (COIL PACK)Application & Cylinder No. Coil Driver Breakout Box Terminal No. DTC 2.0L 1 1 26 P0351 3 2 52 P0352 4 1 26 P0351 2 2 52 P0352 3.0L 1 1 26 P0351 4 2 52 P0355 2 3 78 P0354 5 4 1 P0352 3 5 27 P0356 6 6 53 P0353 - Check IGN START/RUN Voltage To Coil Pack
Disconnect coil. Turn ignition on, engine off. Measure voltage between ground and IGN START/RUN circuit at ignition coil harness connector. Turn ignition off. If voltage reading is more than 10.0 volts, for 2.0L go to step 6. For 3.0L, go to next step. If voltage reading is not more than 10 volts, check condition of No. 19 STARTER fuse (40-amp) in under-hood battery junction box. If fuse is okay, repair open circuit. If fuse/fuse link is burned, check IGN START/RUN circuit for short to ground. See WIRING DIAGRAMS article. Repair as necessary. After repair, go to step 11. - DTC P0351, P0356: Crankshaft Position Sensor Failure
If DTC P0351 or DTC P0356 are present, go to next step. If DTC P0351 or P0356 are not present, go to step 6. - Check Resistance Of Crankshaft Position Sensor
Measure resistance of Crankshaft Position (CKP) sensor. If resistance reading is 290-390 ohms, go to next step. If resistance reading is not as specified, replace CKP sensor. After repair, go to step 13. - Check Functionality Of Suspect Coil Driver (CD) Circuit
Connect test light between IGN START/RUN and suspect CD circuit at ignition coil harness connector. See IGNITION COIL-TO-CYLINDER CORRELATION (COIL PACK) table. Disable fuel pump by disabling Inertia Fuel Shutoff (IFS) switch. Observe test light while cranking engine. If test lamp does not blink consistently, go to next step. If test lamp blinks consistently, go to step 11. - Check Suspect CD Circuit For Open In Harness
Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Measure resistance of suspect CD circuit between breakout box terminal and ignition coil harness connector. See IGNITION COIL-TO-CYLINDER CORRELATION (COIL PACK) table. See Fig 1 and Fig 2 . If resistance reading is less than 5 ohms, go to next step. If resistance reading is not as specified, repair open circuit. See WIRING DIAGRAMS article. After repair, go to step 13.Courtesy of MAZDA MOTORS CORP.
- Check Suspect CD Circuit For Short To VPWR In Harness
Turn ignition on, engine off. Measure voltage of suspect CD circuit between ground and breakout box terminal. See IGNITION COIL-TO-CYLINDER CORRELATION (COIL PACK) table. If voltage reading is less than one volt, go to next step. If voltage reading is not as specified, repair short to power. See WIRING DIAGRAMS article. After repair, go to step 13. - Check Suspect CD Circuit For Short To Ground In Harness
Disconnect scan tool. Measure resistance of suspect CD circuit between ground and breakout box terminal. See IGNITION COIL-TO-CYLINDER CORRELATION (COIL PACK) table. If resistance reading is more than 10,000 ohms, go to next step. If resistance reading is not as specified, repair short circuit. See WIRING DIAGRAMS article. After repair, go to step 13. - PERFORM INTERMITTENT TEST ON SUSPECT CD CIRCUIT HARNESS
Connect DVOM to suspect CD circuit between breakout box terminal and ignition coil harness connector. See IGNITION COIL-TO-CYLINDER CORRELATION (COIL PACK) table. Wiggle and bend CD harness from PCM 104-pin harness connector to ignition coil harness connector. See Fig 1 and Fig 2 . If resistance reading fluctuated during wiggle test, repair intermittent fault in harness. See WIRING DIAGRAMS article. After repair, go to step 13. If resistance reading did not fluctuated during wiggle test, replace PCM. After repair, go to next step to check for damaged coil. - Check Suspect Primary Coil For Open
Measure resistance of suspect coil between CD and IGN START/RUN circuits at ignition coil connector. See Fig 1 and Fig 2 . If resistance reading fluctuated during wiggle test, repair intermittent fault in harness. If resistance reading is less than 5 ohms, go to step 13. If resistance reading is not as specified, replace ignition coil. After repair, go to step 13. - Check Suspect Secondary Coil For Open
Remove both plug wires from ignition coil of suspect cylinder. Measure resistance of suspected coil driver between terminals. If resistance reading is 10,000-14,500 ohms and DTC P0350 is present, refer to DTC P0350: IGNITION COIL PRIMARY CIRCUIT - MALFUNCTION . If no additional DTCs are present, refer to INTERMITTENT testing under SYSTEM TESTS . If resistance reading is not as specified, replace ignition coil. After repair, go to step 13. - Drive Cycle
Reconnect all disconnected connectors. Clear DTCs from PCM memory using scan tool. Perform Fuel or Misfire Monitor Drive Cycle. Refer to MONITOR REPAIR VERIFICATION DRIVE CYCLES . Retrieve pending code. If same DTC is present, replace PCM. After repair, go to next step. If same DTC is not present, go to next step. - Verify Trouble Shooting Of DTCs Completed
Perform PCM Quick Test. If any DTC is present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, trouble shooting is complete.