P1AD698 - P1AD698 Charging Port Temperature Generally High 3 (EU Standard 7kW)

P1AD698 Fault Code Technical Description Document

### P1AD698 Charging Port Temperature Generally Overly High 3 (Euro Standard 7kW) In-depth Definition and System Logic Analysis

Fault Deep Definition DTC (Diagnosis Trouble Code) P1AD698 is a key monitoring identifier for charging interface thermal safety in EV energy management control systems. This fault code specifically applies to vehicle platforms compliant with Euro Standard 7kW charging protocol, its core function being real-time monitoring of temperature status in the AC/DC charging port area. At the system integration level, this diagnostic item belongs to a part of the high-voltage safety protection circuit, aiming to prevent insulation failure or connector physical damage caused by over-heating of the charging interface. When the integrated intelligent front-drive controller receives feedback signals from the charging port temperature sensor, the system will evaluate based on preset safety logic to ensure compliance with thermal management regulatory requirements in European automobile manufacturing standards (E-mark).

### Common Fault Symptoms

Driver perceptible abnormal experiences and system feedback When P1AD698 fault triggers, vehicle control system enters protection mode, cutting off high-voltage circuit to ensure safety. Owners/users may observe following phenomena during driving/charging:

• Vehicle cannot accept AC or DC charging commands (i.e., cannot charge).
• High-voltage system inside vehicle cannot release energy externally or perform energy recovery management (i.e., cannot discharge).
• High-voltage safety warning light on dashboard lights up or BMS (Battery Management System) fault indicator flashes.
• On-board information entertainment system displays "Unable to charge" or related over-temperature warning prompts.

### Core Fault Cause Analysis

Multidimensional attribution of fault source According to technical diagnosis logic, triggering of this fault code stems from failure possibility in three core dimensions, need strictly analyze according to following categories:

1. Hardware Component Level (AC/DC Charging Port itself)

   • Fault Description: Refers to internal high-temp sensor damage, thermistor drift or poor physical contact inside AC/DC charging port.
   • Technical Mechanism: Temperature sensing element performance degradation under extreme thermal environment of charging interface, unable to accurately reflect interface real-time temperature.

2. Line & Physical Connection Level (Signal Transmission Link)

   • Fault Description: Involves integrity damage or electrical connection interruption of AC/DC charging port temperature sampling harness.
   • Technical Mechanism: Includes internal harness wire break, pin contact resistance too large or shielding layer damaged, causing sensor signal attenuation or distortion when transmitting to controller (such as appearing high-resistance state or short signal).

3. Controller Logic Level (Integrated Intelligent Front-Drive Controller)

   • Fault Description: Points to internal logic computation unit anomaly in vehicle domain control or BMS Integrated Intelligent Front-Drive Controller.
   • Technical Mechanism: Controller's analog-to-digital conversion (ADC) module sampling error on sensor voltage signal, or firmware threshold judgment logic deviation when processing temperature data, leading to false fault code reporting under normal temperature.

### Technical Monitoring & Trigger Logic

System determination conditions and numerical monitoring strategy Controller internal algorithm strictly follows specific input conditions and output actions, its monitoring logic analysis as follows:

• Monitoring Target Signal

  • For AC/DC charging port temperature analog or digital pulse signal. This signal used to feedback physical location and rotation speed (correction used here: used to feedback thermal state of charging interface in real-time). System continuously acquires instantaneous temperature data $T_{current}$.

• Numerical Range & Threshold Determination

  • According to original fault definition, core of trigger determination lies in whether meeting following inequality relationship: $$ T_{port} > T_{threshold} $$
  • Where, $T_{port}$ represents real-time monitored charging port temperature, $T_{threshold}$ represents protection regulation valve threshold written inside controller. Although specific $T_{threshold}$ value not disclosed in open original data, logic clearly requires temperature must exceed regulation valve to generate fault code.

• Specific Condition & Trigger Timing

  • Set Fault Condition: Only valid when vehicle is in charging mode or high-voltage activation state allowed for discharge. When AC/DC charging port temperature continuously exceeds system set protection regulation valve, control unit (ECU) enters preset fault timing window.
  • Trigger Fault Condition: If above limit exceeded status confirmed within diagnostic cycle and no automatic reset condition met, system will generate and output fault code P1AD698. At this time, vehicle controller will lock charging interface relay to execute hardware protection strategy.