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Home >> Mazda >> 2006 >> Tribute s, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting - Engine (3 Of 5) >> Fuel Injector Malfunction

Fuel Injector Malfunction

DTC P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277 DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277 FUEL INJECTOR MALFUNCTION
DETECTION CONDITION
  • P0201-P0206 indicates the fuel injector does not operate electrically even though the harness assembly and fuel injectors test satisfactorily.
  • P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, and P0277 indicate a concern is detected in the fuel injector interface module in the primary (forward) fuel injector circuit.
POSSIBLE CAUSE
  • Faulty fuel injector driver within the PCM.
HINT Fuel Injector Description 
  • Solenoid-operated valve that meters fuel flow to the engine.
    • Opens and closes a constant number of times per crankshaft revolution.
    • The amount of fuel is controlled by the length of time it is held open.
  • Normally closed and is operated by 12 V VPWR from the electronic engine control power relay with the ground controlled by the PCM.
G04318969Courtesy of MAZDA MOTORS CORP.
DTC P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277 DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 PCM QUICK TEST
  • Was PCM Quick Test performed? 
 Yes Go to next step.
No Perform PCM Quick Test. See PCM QUICK TEST .
2 CHECK INJECTOR FAULT PIDS
  • Access INJ1F-INJ6F PIDs using WDS or equivalent tester.
  • Is an injector(s) fault present? 
 Yes Go to next step.
No Go to step 6.
3 CHECK FUEL INJECTOR(S) AND HARNESS RESISTANCE
NOTE:
  • This erases Continuous Memory DTCs.

  • Disconnect PCM.
  • Disconnect PCM Power Relay.
  • Install Breakout Box, leave PCM disconnected.
    NOTE:
    • Use the injector fault PID to determine the fuel injector circuit(s) requiring testing.
  • Measure resistance of fuel injector between suspect INJ circuit PCM test pin and PCM power relay pin 87 (R).
  • Is the resistance between 11.0-18.0 ohms? 
 Yes Replace PCM.
POWERTRAIN CONTROL MODULE (PCM) .
Go to step 6.
No Go to next step.
4 CHECK FUEL INJECTOR HARNESS RESISTANCE
  • Disconnect fuel injector harness connector at the suspect fuel injector.
  • Measure resistance of circuit between PCM power relay pin 87 and the fuel injector harness connector.
  • Measure resistance of INJ circuit between appropriate PCM test pin and the fuel injector harness connector.
  • Is each resistance less than 5.0 ohms? 
 Yes Go to next step.
No Repair open harness circuit.
Go to step 6.
5 CHECK FUEL INJECTOR HARNESS CIRCUIT FOR SHORT TO POWER AND GROUND
  • Measure resistance between suspect INJ circuit PCM test pin and PCM power relay pin 87 (R).
  • Measure resistance between suspect INJ circuit PCM test pin and PCM test pin C48 (PWR GND).
  • Is each resistance greater than 10K ohms? 
 Yes Replace PCM.
POWERTRAIN CONTROL MODULE (PCM) .
Repeat PCM Quick Test. See PCM QUICK TEST .
Go to next step.
No Repair short circuit.
Go to next step.
6 VERIFY TROUBLESHOOTING OF DTCs COMPLETED
  • Make sure to reconnect all disconnected connectors.
  • Clear DTCs from PCM memory using WDS or equivalent tester generic OBD II function.
  • Perform PCM Quick Test. See PCM QUICK TEST .
  • Is same DTC present? 
 Yes Replace PCM.
POWERTRAIN CONTROL MODULE (PCM) .
Repeat PCM Quick Test. See PCM QUICK TEST .
No If any other DTC is present, go to applicable DTC inspection.
If no DTC is present, troubleshooting complete.
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