Chapter 34 · Hardware, Harness & Electrical Management

PCB Repair & IC Pinouts

PCB silicon map, IC pinouts, and safe rework of the 30344 smart driver.

Calibration symbols

DFPM G186 J299 N112 N205 N249 V144 J17 N75 N80

ECUs covered

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10 symbols · 2 diagrams · ~803 words

PCB silicon map, IC pinouts, and safe rework of the 30344 smart driver.

When diagnosing severe physical ECU damage—such as blown injector drivers from pinched wiring harnesses, burned throttle motor H-bridges, or shorted 5.0\text{V} sensor reference supplies—calibrating software is useless without physical board repair. The Bosch ME7.5 printed circuit board utilizes a multi-layer FR-4 stackup with heavy internal copper ground planes designed to sink inductive energy.

This section provides the component-level silicon reference map, tracing the primary integrated circuits (ICs) on the ME7.5 motherboard, their functional roles, pinouts, and physical rework protocols.

┌──────────────────────────────────────────────────────────────────────────────────────────────────┐
│                   BOSCH ME7.5 PRINTED CIRCUIT BOARD (PCB) SILICON COMPONENT MAP                  │
├──────────────────────────────────────────────────────────────────────────────────────────────────┤
│                                      [ 121-Pin Wiring Header ]                                   │
│                                                  │                                               │
│       ┌───────────────────────┬──────────────────┴──────────────────┬───────────────────────┐    │
│       ▼                       ▼                                     ▼                       ▼    │
│ [ Bosch 30344 / CJ945C ] [ Bosch 30348 / CJ220 ]         [ Bosch 30345 / CJ125 ] [ TJA1050 ]    │
│ Smart Low-Side Driver    H-Bridge DC Motor Driver        Wideband O2 Controller  High-Speed CAN  │
│ Drives: Injectors 1–4,   Drives: Electronic Throttle     Interfaces: LSU 4.2     Transceiver     │
│ N75, N249, N205, N112,   Plate Motor (G186)              Pins 51, 52, 70, 71     Pins 58 & 60    │
│ N80, J17, J299, Pin 116                                                                          │
│       │                       │                                     │                       │    │
│       └───────────────────────┼─────────────────────────────────────┼───────────────────────┘    │
│                               ▼                                     ▼                            │
│                   [ Siemens / Infineon C167CR-LM ]      [ Bosch 30343 Power Management ]         │
│                   16-Bit RISC Microcontroller           Multi-rail regulator: +5.0V Sensor,      │
│                   144-Pin MQFP Package                  +3.3V Logic, Power-On Reset, K-Line      │
│                               │                                     │                            │
│                               ▼                                     ▼                            │
│                   [ AMD AM29F800BB Flash ]              [ ST 95040 / 95080 SPI EEPROM ]          │
│                   1024 KB Parallel Flash (44-Pin SOP)   512B / 1024B Non-Volatile Memory         │
└──────────────────────────────────────────────────────────────────────────────────────────────────┘

34.1. Master Silicon IC Reference & Functional Registry#

Component Marking	Industry / OEM Part No.	Package Type	Functional Role & Pin Count	Typical Failure Mode
`C167CR-LM`	SAK-C167CR-LM (Infineon)	144-Pin MQFP	Main 16-Bit Processing Unit (24 MHz)	Complete ECU no-communication / bricked
`AM29F800BB`	AM29F800BB-70SE (AMD/Spansion)	44-Pin PSOP	1024 KB External Parallel Flash Memory	Checksum failure / corrupted boot sector
`95040` / `95080`	STMicroelectronics 95040/95080	8-Pin SOIC	Serial SPI EEPROM (Adaptations & Immo)	DTC P1603 (EEPROM Error) / Immo locked
`30343`	Bosch Custom Power ASIC	36-Pin PowerSO	Voltage Regulator (5V/3.3V) & K-Line	No 5V sensor power (P0642) / No K-Line
`30344` / `CJ945C`	Bosch Smart DMOS Switch	64-Pin HiQuad	14-Channel Low-Side Power Driver	Blown injector channel / Stuck N75
`30348` / `CJ220`	Bosch Full H-Bridge	20-Pin PowerSO	Bidirectional E-Gas Motor Driver (`G186`)	Throttle limp mode (P1545 / P1559)
`30345` / `CJ125`	Bosch Wideband Interface	24-Pin SOIC	LSU 4.2 Nernst/Pump Cell Controller	O2 heater / activity DTCs (P0130/P0134)
`30397` / `CK110`	Bosch Ignition Pre-Driver	20-Pin SSOP	4-Channel 5V Logic Trigger for Coils	Dead ignition cylinder (No spark on cyl N)
`HIP9011`	Harris / Intersil HIP9011	28-Pin SOIC	Dual Knock Sensor Signal Conditioning	Knock sensor circuit DTCs (P0327/P0332)
`TJA1050`	NXP TJA1050 / PCA82C250	8-Pin SOIC	500 kbps Differential CAN Transceiver	CAN bus communication dropout (P1626)

34.2. Pinout & Channel Mapping of the Bosch `30344` Smart Low-Side Driver#

The Bosch 30344 is a 14-channel smart power DMOS array with integrated internal voltage clamping (45\text{V}) to safely absorb the inductive flyback energy generated when solenoids and fuel injector coils collapse:

Channel Output Pin	Target Wiring Terminal	Driven Actuator Subsystem
Output Channel 1	ECU Pin 88	Fuel Injector Cylinder 1 (N30)
Output Channel 2	ECU Pin 89	Fuel Injector Cylinder 2 (N31)
Output Channel 3	ECU Pin 96	Fuel Injector Cylinder 3 (N32)
Output Channel 4	ECU Pin 97	Fuel Injector Cylinder 4 (N33)
Output Channel 5	ECU Pin 104 / 105	Wastegate Frequency Solenoid (N75)
Output Channel 6	ECU Pin 64	Diverter Valve Solenoid (N249)
Output Channel 7	ECU Pin 112	Variable Cam Timing Solenoid (N205)
Output Channel 8	ECU Pin 115	Secondary Air Combivalve Solenoid (N112)
Output Channel 9	ECU Pin 15	EVAP Canister Purge Solenoid (N80)
Output Channel 10	ECU Pin 65	Fuel Pump Master Relay Trigger (J17)
Output Channel 11	ECU Pin 106	Secondary Air Pump Relay Trigger (J299)
Output Channel 12	ECU Pin 113	EVAP Leak Detection Pump Solenoid (V144)
Output Channel 13	ECU Pin 116	Spare Uncommitted PWM Driver Stage
Output Channel 14	Internal PCB	Cooling Fan Stage 1 Relay Driver

34.3. Hardware Diagnostic Measurements & Rework Protocols#

1. Diagnosing a Missing 5.0\text{V} Sensor Reference (DTC `P0642` / `P0643`)#

Connect bench power (Pins 1 & 2 Ground, Pin 21 +12\text{V}, Pin 62 +12\text{V}).
1. Inspect the small surface-mount Schottky protection diode adjacent to the 30343 regulator. A shorted engine harness (e.g. cam sensor wire grounding out on the cylinder head) frequently blows this protection diode.
2. If the diode is intact but the 30343 gets hot to the touch (> 80\text{°C}), the internal regulator pass transistor is destroyed; replace the 30343 IC.
Measure voltage on ECU Pin 108 (Sensor Reference) relative to Pin 4 (Sensor Ground).
If Voltage is 0.0\text{V}:

2. Component Rework Technique (Preventing Thermal Pad Lifting)#

Because the ME7.5 PCB incorporates massive internal ground planes, touching an iron tip directly to an IC pin will draw away heat instantly, risking ripped copper traces.

Rework Protocol:
1. Place the bare PCB on a pre-heater plate set to 140\text{°C} \dots 150\text{°C} for 5 minutes to soak the ground planes.
2. Apply tacky no-clean RMA flux generously across all pins.
3. Use a focused hot-air nozzle (340\text{°C} \dots 360\text{°C} at medium airflow) circling the perimeter of the IC until all solder joints liquefy simultaneously.
4. Lift the chip vertically using vacuum tweezers; never force or pry while solder is partially solid.
5. Clean pads with copper desoldering braid and isopropyl alcohol (99\%) before seating the replacement silicon.

Cross-referenced on shared calibration symbols, not on subject matter — these are the chapters that touch the same maps.