Stefan Lohmaier
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Phase 2 of the English translation: Word documents (filled, EPB-specific): - 8 plans (PID, PM, QA, SWE, Test, Project Manual, CM, RM) - 6 safety docs (HARA, Safety Case, FMEDA, MISRA Compliance, Verification Report, Tool Qualification Cppcheck) - 2 manuals (User, Service) - 3 audit artefacts (Review minutes, NC-001, MISRA-REC-001) - All regenerated via pandoc from English markdown sources Code, tests, headers: - All file headers, struct comments, function docstrings in English - All test names (TEST_BEGIN strings) translated - Inline comments translated - 46 tests still green after translation CI workflows: - All step names in English - Step descriptions, comments, release notes template in English README.md fully rewritten in English with proper guided tour. Phase 3 (still pending): dev-process repo templates + toolstack/setup docs.
139 lines
5.2 KiB
Markdown
139 lines
5.2 KiB
Markdown
---
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doc-id: SLM-EPB-SVC-001
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version: 1.0
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status: Released
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date: 2026-05-12
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---
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# Service Manual — Electric Parking Brake (EPB)
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| Field | Value |
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|---------------|----------------------------------------|
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| Product | demo-epb EPB ECU |
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| Version | 1.0 |
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| Date | 2026-05-12 |
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| Audience | Workshop technicians |
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---
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## 1. Tools
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- OBD-II diagnostic tester with UDS support (ISO 14229)
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- Torque wrench 60 Nm
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- Sliding tool 28×40 mm (for brake-pad replacement)
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## 2. UDS diagnostics
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### 2.1 Identification
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| Parameter | Value |
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|-------------------|-------------|
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| Tester address | 0x712 |
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| ECU response | 0x71A |
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| CAN baud rate | 500 kbit/s |
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### 2.2 Service IDs
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| SID | Service | Notes |
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|------|-------------------------------|--------------------------------|
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| 0x10 | DiagnosticSessionControl | 0x03 = Extended Session |
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| 0x11 | ECUReset | 0x01 = Hard Reset |
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| 0x14 | ClearDiagnosticInformation | Clears all DTCs |
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| 0x19 | ReadDTCInformation | Sub 0x02 = reportDTCByStatusMask |
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| 0x22 | ReadDataByIdentifier | See DID list |
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| 0x27 | SecurityAccess | Not implemented in demo |
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| 0x31 | RoutineControl | 0x0301 = Service mode |
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### 2.3 DIDs (Data Identifiers)
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| DID | Description | Type |
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|--------|--------------------------------------|----------------|
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| 0xF187 | SW version | ASCII 16 byte |
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| 0xF18B | ECU hardware version | ASCII 16 byte |
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| 0x0301 | Clamping force left | uint16 (N) |
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| 0x0302 | Clamping force right | uint16 (N) |
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| 0x0303 | Motor current left | uint16 (mA) |
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| 0x0304 | Motor current right | uint16 (mA) |
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| 0x0305 | Inclinometer (filtered) | int16 (m°) |
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## 3. DTC list
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| DTC | Meaning | Action |
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|----------|---------------------------------------------------|----------------------------------------|
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| P0571 | EPB switch plausibility | Check switch |
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| P0572 | EPB switch permanently actuated | Switch jammed? Clean |
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| P0808 | Actuator current left too high (overcurrent) | Check motor + wiring |
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| P0809 | Actuator current right too high (overcurrent) | Check motor + wiring |
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| P080A | Clamping force left not reached (apply timeout) | Check actuator / mechanism |
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| P080B | Clamping force right not reached | Check actuator / mechanism |
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| P080C | Wheel-speed sensor plausibility | Check sensors / wiring |
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| P080D | Inclinometer plausibility | Check sensor / mounting |
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| P080E | Apply controller watchdog trip | Software reset; if recurring replace ECU |
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| U0123 | CAN bus communication lost | Check CAN wiring + BCM status |
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## 4. Service mode (brake-pad replacement)
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### 4.1 Activation
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Preconditions:
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- Ignition on, engine off
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- Vehicle on lift or with chocked wheels
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- Driver door closed (or door signal bypassed)
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Steps:
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1. Connect diagnostic tester, Extended Session (0x10 0x03)
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2. Send RoutineControl `0x31 01 03 01` — start routine
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3. ECU acknowledges, EPB LED starts blinking at 2 Hz
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4. Actuators move to maintenance position (fully released)
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### 4.2 Deactivation
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1. Send RoutineControl `0x31 02 03 01` — stop routine
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2. EPB LED stops blinking
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3. Apply function available again
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### 4.3 Brake-pad replacement procedure
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1. Activate service mode (see above)
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2. Remove brake calliper
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3. Replace pads, grease guides
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4. Tighten calliper to 60 Nm
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5. Deactivate service mode
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6. Perform three apply/release cycles (bedding-in)
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7. Clear DTC memory (service 0x14)
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## 5. Sensor check
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### 5.1 Wheel-speed sensors
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- Resistance: 800-1500 Ω at 20 °C
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- Voltage at 50 km/h: 2-5 V peak-to-peak (Hall)
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### 5.2 Inclinometer
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- SPI bus 1 MHz
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- Expected value on level road: 0 ± 0.5°
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- Drift check: ECU + tester, monitor > 5 min
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## 6. Actuator check
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| Parameter | Target value |
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|-----------------------|------------------------|
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| Resistance per motor | 0.8 – 1.2 Ω |
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| Nominal current | 3 – 5 A |
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| Peak current (apply) | 15 – 25 A |
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| Cutoff threshold | 8 A for 100 ms |
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## 7. Software update
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1. UDS Extended Session (0x10 0x03)
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2. Programming Session (0x10 0x02)
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3. Flashloader sequence per OEM specification
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4. Verify new SW version via DID 0xF187
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## 8. Revision history
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| Version | Date | Change | Author |
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|---------|-------------|---------------------|------------|
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| 1.0 | 2026-05-12 | First release | S. Lohmaier|
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