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SINOTRUK ZQGJ-LHY EOL Diagnostic Tool
Core Testing Procedures
1. ECU Configuration, Programming, and Locking: Writing the vehicle's VIN to the engine, transmission, and central gateway controllers. Pneumatic and electronic control parameters are locked to ensure seamless communication between modules across the vehicle network (CAN bus)-such as ABS, transmission TCU, and bodywork controllers.
2. Pneumatic and Electro-Hydraulic Gear Shifting Test (Critical): Since many dump trucks and sanitation vehicles are equipped with add-on pneumatic Power Take-Offs (PTOs), the EOL system issues pneumatic actuation commands to verify that pneumatic pressure switches engage and disengage smoothly at standard operating pressures and that the corresponding dashboard indicator lights illuminate correctly.
3. Static and Dynamic Sensor Calibration: Performing initial zero-point calibration for the vehicle stability system, clutch pedal travel sensor, and transmission high/low range pneumatic valve switches.
4. Diagnostic Trouble Code (DTC) Clearing: Reading and clearing-via a one-touch function-any sporadic historical DTCs generated during the final assembly process (e.g., due to power interruptions or wiring harness disconnection/reconnection), ensuring no warning lights appear on the dashboard upon delivery to the customer.
Core Inspection Checklist & Standards (EOL Stage)
| Category | Core Testing Item | Pass Standard | Component Correlation |
|---|---|---|---|
| Electronics & Communication | CAN Network Topology Scan | 0% node packet loss; no missing responses from ECUs. | Ensures seamless communication between central gateway and powertrain. |
| Pneumatic System | PTO Cylinder Actuation Voltage/Pressure | Solenoid valve driven at 24V; air pressure remains stable. | Triggers the Piston O-Ring movement; guarantees zero air leaks. |
| Signal Feedback | Upper Body Engagement Indicator Status | Instrument cluster displays 100% warning light illumination upon engagement. | Tests whether the PTO Pressure Switch has achieved electrical continuity. |
| Gearbox Status | Neutral Switch Signal Sequence | Neutral position signal must be precise to prevent starting in gear. | Correlates with the safety interlock of the HW90510C main box. |
Diagnostic Fault Matrix (EOL Station)
| EOL Error Code | Failed Test Performance | On-Site Troubleshooting Advice |
|---|---|---|
| ERR_CAN_TIMEOUT_01 | TCU (Transmission Control Module) response timeout | Check the wiring harness connector at the auxiliary box of the HW90510C gearbox for looseness or backed-out pins. |
| ERR_PNEUMATIC_LOW_02 | PTO engagement feedback timeout / Insufficient air pressure | 1. Verify that the factory workshop auxiliary air supply is ≥ 0.7 MPa. 2. Check if the PTO cylinder Piston O-Ring is leaking air. |
| ERR_SW_MISMATCH_03 | VIN or configuration word flashing failure (Configuration conflict) | Verify whether the vehicle configuration code (LHY platform) in the MES dispatch system matches the actual sensors installed on the truck. |
| ERR_FEEDBACK_OPEN_04 | Instrument cluster PTO indicator light fails to illuminate / Open circuit error | Inspect the wiring harness connected to the PTO Pressure Switch, and measure for open circuits or poor contact. |
| ERR_NEUTRAL_LOST_05 | Neutral safety interlock test failed (Engine unable to crank) | Adjust the neutral sensor shims/washers on the gearbox to ensure the main box shifter sits at the absolute zero position. |
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