Archives: DTC Codes

What Does Code P1683 Mean? DTC P1683 signifies a malfunction within the Metering Oil Pump (MOP) Temperature Sensor Circuit. This code is predominantly found in vehicles equipped with rotary engines, such as the Mazda RX-8, where a precise oil injection system is critical for internal lubrication and apex seal cooling. The Engine Control Module (ECM), […]

What Does Code P1684 Mean? DTC P1684, indicating a “Metering Oil Pump Position Sensor Circuit Malfunction,” signifies that the Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), has detected an electrical fault or an implausible signal within the circuit dedicated to the Metering Oil Pump (MOP) position sensor. The […]

What Does Code P1686 Mean? The diagnostic trouble code P1686 indicates a malfunction within the electrical circuit of the Metering Oil Pump (MOP) stepping motor. This code is generated by the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), when it detects an electrical anomaly in the MOP’s control circuit. The […]

What Does Code P1688 Mean? DTC P1688 signifies a detected malfunction within the Metering Oil Pump (MOP) Stepping Motor circuit. This code is typically encountered in vehicles equipped with a separate, electronically controlled oil injection system, most notably in Mazda’s rotary engines (e.g., Renesis in the RX-8) or certain direct injection gasoline engines where precise, […]

What Does Code P1689 Mean? DTC P1689 signifies an electrical circuit malfunction detected by the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), related to the Oil Pressure Control Solenoid. This solenoid is a critical component in modern engines that utilize variable oil pump displacement or multi-stage oil pressure regulation systems. […]

What Does Code P1691 Mean? DTC P1691 signifies an electrical malfunction within the circuit controlling the Turbocharger Pressure Control Solenoid. This code is generated by the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), when it detects that the electrical parameters of the turbocharger boost control solenoid circuit are outside the […]

What Does Code P1693 Mean? DTC P1693 signifies a detected malfunction within the turbocharger/supercharger control circuit. This code is generally manufacturer-specific, with the “16” indicating an auxiliary emission controls system (which includes turbocharger management) and the “93” often pointing to a specific circuit or component within that system related to control or feedback. The Engine […]

What Does Code P1694 Mean? The OBD-II diagnostic trouble code P1694 signifies a malfunction within the electrical circuit controlling the turbocharger/supercharger charge air relief valve. This circuit is critical for managing boost pressure, primarily to prevent compressor surge and protect the turbocharger and intercooler system when the throttle abruptly closes. The Engine Control Module (ECM), […]

What Does Code P1702 Mean? DTC P1702 indicates an intermittent malfunction within the Transmission Range Sensor (TRS) circuit. The Transmission Range Sensor, often referred to as the Manual Lever Position Sensor (MLPS) or Neutral Safety Switch, is a critical component that communicates the current shifter position (Park, Reverse, Neutral, Drive, and lower gears) to the […]

What Does Code P1704 Mean? DTC P1704 indicates that the Powertrain Control Module (PCM) or Engine Control Module (ECM) has detected an anomaly in the state transitions of the Digital Transmission Range Sensor (TRS) during its self-diagnostic tests, specifically conducted in Key On, Engine Off (KOEO) or Key On, Engine Running (KOER) modes. The Transmission […]