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Mazda P1621 Immobilizer system code word does not match DETECTION CONDITION •  Cord word stored in instrument cluster and PCM does not to match. POSSIBLE CAUSE •  Immobilizer system malfunction •  PCM malfunction Diagnostic procedure STEP INSPECTION ACTION 1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED •  Has the FREEZE FRAME DATA been recorded? Yes Go to the next…

Mazda P1622 Key ID number does not match DETECTION CONDITION •  ID number stored in instrument cluster and PCM does not to match. POSSIBLE CAUSE •  Immobilizer system malfunction •  PCM malfunction Diagnostic procedure STEP INSPECTION ACTION 1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED •  Has the FREEZE FRAME DATA been recorded? Yes Go to the next step….

Mazda P1630 Internal Vref DETECTION CONDITION •  PCM internal malfunction POSSIBLE CAUSE •  PCM malfunction Diagnostic procedure STEP INSPECTION ACTION 1 – – Replace the PCM, then go to the next step. 2 VERIFY AFTER REPAIR PROCEDURE •  Perform the after repair procedure. •  Are any DTCs present? Yes Go to the applicable DTC inspection. No DTC troubleshooting completed.

Mazda P1631 PCM control relay (power hold) DETECTION CONDITION •  The PCM monitors the input voltage from the PCM control relay signal. If the voltages at PCM terminal 241 deviates from the threshold, the PCM determines that the there is a PCM control relay circuit malfunction. POSSIBLE CAUSE •  PCM control relay malfunction •  Connector or terminal malfunction…

Mazda P1632 Smart generator malfunctions sensor/circuit DETECTION CONDITION •  Generator pulse width modulation input – Signal error POSSIBLE CAUSE •  Generator malfunction •  PCM malfunction Diagnostic procedure STEP INSPECTION ACTION 1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED •  Has the FREEZE FRAME DATA been recorded? Yes Go to the next step. No Record the FREEZE FRAME DATA on…

Mazda P1635 Tire/axle out of acceptable range DETECTION CONDITION •  Vehicle identification block – Type / axle out of range POSSIBLE CAUSE •  Tire size is different. •  PCM malfunction Diagnostic procedure STEP INSPECTION ACTION 1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED •  Has the FREEZE FRAME DATA been recorded? Yes Go to the next step. No Record…

Mazda P1602 Immobilizer/PCM communication error DETECTION CONDITION •  PCM internal malfunction POSSIBLE CAUSE •  PCM malfunction Diagnostic procedure STEP INSPECTION ACTION 1 – – Replace the PCM, then go to the next step. 2 VERIFY AFTER REPAIR PROCEDURE •  Perform the after repair procedure. •  Are any DTCs present? Yes Go to the applicable DTC inspection. No DTC troubleshooting…

Mazda P1603 EEPROM malfunction DETECTION CONDITION •  PCM internal malfunction POSSIBLE CAUSE •  PCM malfunction Diagnostic procedure STEP INSPECTION ACTION 1 – – Replace the PCM, then go to the next step. 2 VERIFY AFTER REPAIR PROCEDURE •  Perform the after repair procedure. •  Are any DTCs present? Yes Go to the applicable DTC inspection. No DTC troubleshooting completed.

Mazda P1608 Mazda P1609 PCM processor DETECTION CONDITION •  PCM internal malfunction POSSIBLE CAUSE •  PCM malfunction Diagnostic procedure STEP INSPECTION ACTION 1 – – Replace the PCM, then go to the next step. 2 VERIFY AFTER REPAIR PROCEDURE •  Perform the after repair procedure. •  Are any DTCs present? Yes Go to the applicable DTC inspection. No DTC…

Mazda P1402 EGR metering orifice restricted DETECTION CONDITION •  The PCM monitors the input voltage from the EGR valve position sensor signal. If the voltages at PCM terminal 129 deviates from the threshold, the PCM determines that the there is a EGR system range/performance malfunction. POSSIBLE CAUSE •  EGR valve malfunction •  Air leakage in intake-air system •  MAP…

Mazda P1412 EGR valve frozen DETECTION CONDITION •  The PCM monitors the input voltage from the EGR valve position sensor signal. If the voltages at PCM terminal 129 deviates from the threshold, the PCM determines that the there is a EGR valve malfunction. POSSIBLE CAUSE •  EGR valve servo motor malfunction •  Contaminate on EGR valve •  EGR valve…

Mazda P1551 Fuel injector No.1 range/performance malfunction DETECTION CONDITION •  The PCM monitors the fuel injector No.1. If the voltage at PCM terminals 118 and 101 remains low, the PCM determines that there is a fuel injector No.1 circuit problem. POSSIBLE CAUSE •  Fuel injector No.1 malfunction •  Connector or terminal malfunction •  Short to ground in the wiring…

Mazda P1552 Fuel injector No.2 range/performance malfunction DETECTION CONDITION •  The PCM monitors the fuel injector No.2. If the voltage at PCM terminals 126 and 110 remains low, the PCM determines that there is a fuel injector No.2 circuit problem. POSSIBLE CAUSE •  Fuel injector No.2 malfunction •  Connector or terminal malfunction •  Short to ground in the wiring…

Mazda P1553 Fuel injector No.3 range/performance malfunction DETECTION CONDITION •  The PCM monitors the fuel injector No.3. If the voltage at PCM terminals 125 and 109 remains low, the PCM determines that there is a fuel injector No.3 circuit problem. POSSIBLE CAUSE •  Fuel injector No.3 malfunction •  Connector or terminal malfunction •  Short to ground in the wiring…

Mazda P1554 Fuel injector No.4 range/performance malfunction DETECTION CONDITION •  The PCM monitors the fuel injector No.4. If the voltage at PCM terminals 117 and 102 remains low, the PCM determines that there is a fuel injector No.4 circuit problem. POSSIBLE CAUSE •  Fuel injector No.4 malfunction •  Connector or terminal malfunction •  Short to ground in the wiring…

Mazda P1574 Mazda P1577 Accelerator pedal position (APP) sensor output disagree DETECTION CONDITION •  The PCM monitors the input voltage from the APP position sensor signal. If the voltages at instrument cluster terminal 2T deviates from the threshold, the PCM determines that the there is an APP position sensor malfunction. POSSIBLE CAUSE •  APP sensor malfunction •  PCM…

Mazda P1295 Injector multiple faults DETECTION CONDITION •  The PCM monitors the fuel injectors No.1, No.2, No.3 and/or No.4. If the voltage at PCM each terminals remains high or low, the PCM determines that there is a fuel injectors No.1, No.2, No.3 and/or No.4 circuit problem. POSSIBLE CAUSE •  Open circuit in the wiring harness between fuel…

Mazda P138A Glow plug relay system voltage DETECTION CONDITION •  The PCM monitors the input voltage from the glow plug relay signal. If the voltages at PCM terminal 210 deviates from the threshold, the PCM determines that the there is a glow plug relay range/performance malfunction. POSSIBLE CAUSE •  Glow plug relay malfunction •  PCM malfunction •  Connector or…

Mazda P138B Glow plug relay system voltage DETECTION CONDITION •  The PCM monitors the input voltage from the glow plug relay signal. If the voltages at PCM terminal 210 deviates from the threshold, the PCM determines that the there is a glow plug relay range/performance malfunction. POSSIBLE CAUSE •  Glow plug relay malfunction •  PCM malfunction •  Connector or…

Mazda P138C Air bypass valve position sensor minimum/maximum stop DETECTION CONDITION •  The PCM monitors the actual air bypass valve position using the air bypass valve position sensor while the engine running. If the air bypass valve position sensor signal response is slower than threshold, the air bypass valve position sensor stuck. POSSIBLE CAUSE •  Air bypass…