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Fuel Injector Malfunction
NOTE:
The following test procedures are for DTCs P0201, P0202, P0203, P0204, P0205 and P0206.
Courtesy of MAZDA MOTORS CORP. FUEL INJECTOR MALFUNCTION INSPECTION/ACTION CHART
| 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. |