Comprehensive diagnostic procedure for electric drivability issues on the 2023 Rivian EDV 500, including electrical system inspection, motor performance testing, and battery management verification.

Warnings

Tools required

Parts

• 12V auxiliary battery (if needed after testing) × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground in a well-ventilated area away from flammable materials
2. Engage parking brake and place wheel chocks at all four wheels
3. Verify customer complaint in detail and document symptoms (reduced power, regenerative braking issues, warning lights, unusual sounds, range loss, etc.)
4. Check for any open recalls or Technical Service Bulletins (TSBs) for the 2023 EDV 500
5. Verify 12V auxiliary battery voltage is at least 12.4V; charge or replace if below specification
6. Ensure diagnostic scan tool is updated with latest Rivian EDV software
7. Don high-voltage protective equipment (insulated gloves, safety glasses, face shield)
8. Perform visual inspection of vehicle exterior for accident damage or modifications

Procedure

1. 1

   Initial System Scan and Code Retrieval
   Connect diagnostic scan tool to OBD-II port located under driver-side dashboard. Power on vehicle to accessory mode without enabling drive mode. Perform full system scan including: Battery Management System (BMS), Motor Control Units (both front and rear), Vehicle Control Module (VCM), Anti-lock Braking System (ABS), Electronic Stability Control (ESC), and all ancillary systems. Record all active and stored DTCs with freeze frame data, software versions, and system parameters.
2. 2

   12V Auxiliary Battery System Test
   Test 12V auxiliary battery voltage and perform load test. Battery should maintain at least 12.4V at rest and no less than 9.6V under 200A load for 15 seconds. Inspect all 12V connections, especially ground points in battery compartment. Check DC-DC converter operation using scan tool to verify high-voltage battery is properly charging the 12V system (should show 13.8-14.4V during operation). Many drivability issues on electric vehicles stem from weak 12V systems affecting control modules.
3. 3

   High-Voltage Battery Pack Inspection
   Using scan tool, review high-voltage battery pack parameters: state of charge (SOC), state of health (SOH), individual cell voltages, cell temperature distribution, pack voltage (should be 350-420V nominal), isolation resistance (should exceed 100 ohms/volt), and current draw. Check for cell imbalance greater than 50mV between highest and lowest cells. Review battery thermal management system operation and coolant temperature (should be 60-95°F during operation). Document any anomalies in battery performance data.
4. 4

   Motor Control Unit and Drive System Analysis
   Review motor control parameters for both front and rear drive units. Monitor motor temperatures, resolver/encoder signals, phase current balance, motor speed versus vehicle speed correlation, and torque request versus torque delivery. Check for proper communication between VCM and both motor controllers. Verify motor inverter cooling system operation. Compare left versus right motor parameters if experiencing pull or vibration symptoms. Check for any error counters or communication faults between drive units.
5. 5

   Regenerative Braking System Evaluation
   Test regenerative braking functionality using scan tool monitoring. With vehicle at safe test location, accelerate to 30 mph and release accelerator pedal, monitoring brake energy regeneration current (should show negative amperage returning to battery pack). Verify blended braking operation coordinates properly between regenerative and friction braking. Check for proper pedal feel and modulation. Review brake system DTCs and hydraulic unit operation. Verify brake fluid level meets specifications and no air is present in hydraulic system.
6. 6

   Drive Unit Physical Inspection
   With vehicle safely raised and supported on lift, perform visual inspection of front and rear drive units. Check for fluid leaks from drive unit seals, damaged wiring harnesses, corroded connectors, or physical damage to motor housings. Inspect high-voltage cables for chafing, damage, or loose connections. Check differential fluid levels through fill plugs (front should have 1.5 qt, rear should have 2.0 qt of 75W-90 GL-5). Verify cooling lines to motor assemblies are intact and properly routed.
7. 7

   Thermal Imaging Inspection
   If thermal imaging equipment is available, perform thermal scan of high-voltage battery pack, both motor assemblies, DC-DC converter, and onboard charger after a test drive. Look for hot spots indicating cell imbalance (more than 20°F variation between cells), cooling system blockage, or failing power electronics. Normal operating temperatures: battery pack 60-95°F, motors up to 200°F during heavy use, power electronics 100-160°F. Any component exceeding normal range requires further investigation.
8. 8

   High-Voltage Cable and Connector Inspection
   Visually inspect all high-voltage cabling from battery pack to drive units. Check orange-jacketed cables for any signs of damage, melting, discoloration, or arc marks. Inspect all HV connectors for proper seating, corrosion, or pin damage. Use HV proximity detector to verify no unexpected voltage presence. Check manual service disconnect (MSD) plug is fully seated. Inspect fusing and contactor operation using scan tool to command HV system on/off while monitoring voltage states.
9. 9

   Coolant System Verification
   Verify EV battery/motor coolant level in reservoir (system capacity 10 quarts). Inspect coolant for proper color and condition (should be pink/red EV-specific coolant, not conventional antifreeze). Check for leaks at all cooling system connections, especially at motor heat exchangers and battery pack cooling plates. Use scan tool to command cooling pumps on and verify proper flow. Check coolant temperature sensors for accurate readings. Air in cooling system can cause thermal management issues leading to drivability problems.
10. 10

    Road Test with Data Logging
    Perform controlled road test while data logging all drive system parameters. Test acceleration from stop through 60 mph, monitoring torque delivery, power output, battery current draw, and any power limiting events. Verify smooth power delivery without hesitation, surging, or unexpected deceleration. Test regenerative braking at various speeds. Document any unusual noises, vibrations, or warning messages. Compare actual performance against expected parameters for EDV 500 (dual motor should provide strong, linear acceleration with no lag).
11. 11

    Communication Network Testing
    Using scan tool, verify CAN bus communication integrity between all modules. Check for intermittent communication faults, module timeouts, or signal quality issues. Monitor CAN bus load and verify no modules are creating excessive traffic. Test high-speed and low-speed CAN networks separately. Verify proper gateway operation between network segments. Communication issues can cause intermittent drivability problems that don't set obvious DTCs.
12. 12

    Software Version Verification and Updates
    Check all control module software versions against latest Rivian releases. Many drivability issues are resolved through software updates to BMS, motor controllers, or VCM. If updates are available and relevant to symptoms, document current versions and prepare vehicle for programming. Ensure battery SOC is above 60% and 12V system is fully charged before performing any software updates. Review update release notes for known issue fixes.
13. 13

    Diagnostic Conclusion and Repair Recommendation
    Compile all diagnostic findings including DTCs, test results, data logs, and inspection observations. Cross-reference symptoms with test data to isolate root cause. Common EDV drivability issues include: battery cell imbalance requiring BMS recalibration, motor resolver faults, DC-DC converter failure causing 12V system issues, software calibration problems, cooling system air entrapment, or high-voltage contactor wear. Provide detailed repair recommendation with supporting data. If no faults found, document baseline parameters for future reference and recommend customer drive cycle monitoring.

Reassembly

1. If any components were disconnected during diagnosis, reconnect following proper high-voltage safety procedures
2. Verify all high-voltage connectors are fully seated and secured with locking mechanisms engaged
3. Ensure all fluid levels are correct after any inspection ports were opened
4. Reinstall any removed panels or covers, ensuring proper fastener torque and clip engagement
5. Clear diagnostic trouble codes only after repairs are completed and verified
6. Reset any adaptive values or relearn procedures if components were replaced or software updated

Verification

• Perform final full system scan to verify no DTCs are present after diagnosis/repairs
• Verify high-voltage battery pack isolation resistance exceeds minimum specification (typically >100 ohms/volt)
• Confirm 12V auxiliary battery voltage is within normal range (13.8-14.4V with vehicle on)
• Test drive vehicle replicating original customer complaint to verify issue is resolved or properly documented
• Verify all drive system parameters are within normal operating ranges using scan tool during test drive
• Document all findings, test results, and recommendations in repair order with supporting data screenshots
• If drivability issue persists and cannot be isolated, escalate to Rivian Technical Assistance with full diagnostic data package
• Provide customer with detailed explanation of findings and any recommended follow-up or monitoring

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