Skip to content

1.4.1 PMU Overview

ECUMaster PMU24 DL

Type: Programmable Power Management Unit with Data Logging

Model: ECUMaster PMU24 DL

Manufacturer: ECUMaster

Product Page: ECUMaster PMU24 DL

Installation Manual: PMU User Manual v101.1.5 (PDF)

Pinout Diagram: PMU-24 Pinout v1.1 (PDF)

Wiring Diagram: See Installation Manual (pinout diagrams for PMU24)

Specifications

Outputs:

  • 24 programmable high-side outputs (10×25A, 6×15A, 8×7A)
  • Total capacity: 170A continuous (power supply limited, not sum of outputs)
  • Constraint: Only same-rated outputs can be combined (e.g., 25A + 25A ✓, 25A + 15A ✗)
  • Out 17-24: Dual-purpose - configurable as 7A outputs OR 0-20V analog inputs

Key Features:

  • Dedicated 12V switched input (Pin 7), up to 16 analog inputs, 9 digital inputs
  • 256MB data logger (500 Hz), real-time clock, IMU, inertia switch
  • 2× CAN 2.0 A/B (J1939 compatible), 24× tricolor LED indicators
  • PC config via USB (USB to CAN adapter required)

Physical: 131×112×33mm, 385g, -40°C to +125°C operating range

Grounding Note: PMU is high-side switching only - it switches the positive wire to loads. Each load must have its own ground path back to the battery/chassis. The PMU's ground connection (14 AWG) is only for internal electronics reference, not load current return. This is why PMU doesn't require a heavy ground wire matching the 2/0 AWG power feed.

Configuration Software: PMU Setup v101.2.1 | Full Specs: PMU Manual

Capacity Analysis

Outputs Rating Total Used Available
1-10 25A each 10 5 5
11-16 15A each 6 2 4
17-24 7A each 8 6 2
Total - 24 13 11

Utilization: 13 of 24 outputs used (54%) — 7 freed by relocating the radiator fan, iBooster, and TCU; OUT15 freed when the winch trigger was reallocated to BODY PDU CB43 (2026-05-30)

Primary loads: HVAC (OUT5: ~20A load), GMRS radio (OUT6: ~15A load), aux cooling fans (OUT7+8: 2×15A), Dakota Digital (OUT9: ~25A), wipers (OUT11: 15A), CT4 (OUT13: ~9A), A/C clutch (OUT17: 7A), horn (OUT18: 7A), intercom (OUT20: 7A), brake lights (OUT21: 7A), reverse lights (OUT22: 7A), DRL/parking (OUT23: 7A). Radiator fan (was OUT2+3+4), iBooster main + enable (was OUT1+10, OUT19), and Turbolamik TCU (was OUT16) relocated to the START+ Forward Distribution Bus; the winch contactor trigger (was OUT15) reallocated to BODY PDU CB43 — OUT1–4, 10, 15, 16, 19 now free.

Load: With the radiator fan, iBooster, and TCU relocated to the START+ Forward Bus, PMU peak drops to ~145A theoretical (all radios transmitting), ~85-115A typical continuous — comfortably within the 170A continuous PMU capacity. 7 outputs were freed by the fan/iBooster/TCU relocation and OUT15 by the winch-trigger reallocation; counting the always-spare outputs, 11 of 24 outputs are now unassigned.

Mounting: Engine bay, accessible for LED diagnostics and USB configuration