Monza, Kadett, and Ipanema Multec 700 GM ECU Components Pinout

Monza, Kadett, and Ipanema Multec 700 GM ECU Components Pinout

Applicable Vehicles: Monza, Kadett, and Ipanema (1991–1996 models)


More ECU PINOUT Components:

ECU Modules Repair Pinpout & Components

Main ECU Components and Pinout

  1. Injector Drive
  2. 16156085 – Fuel Pump Relay Drive
  3. 34993 – Stepper Motor Drive
  4. Delco 196 E – 16045980 – PF Relay (Injection Light, Flight Computer, V2 Fan)
  5. Processor
  6. Delco 196 E – 16045980 (V1 Fan, Heating Relay Collector, Ascending Light, A/C Relay)
  7. 34992 – 5V Regulator
  8. NTC Sensor
  9. Processor
  10. Crystal Clock
  11. EPROM, 27C128

 


Technical Specifications

Special Features:

  • Multec 700 ECUs are identical in hardware, with differences only in the calibration memory (Mencal).
  • Drive Beak: Uses IRF540 or IRFZ34N transistors.

Common Defects:

  • Fan Relay Drive Failure
  • Poor Contact at Injector Secondary Drive Terminals and Pump: This can cause ECU failure when moved. Re-soldering the terminals is recommended.

Injector Drive – 3 Pins

  • This component is an NPN transistor with a ferrite washer to minimize electromagnetic interference.
  • Trigger Voltage: 10V range.

Injector Pulse Requirement:

  • To enable injector pulsing, terminals D9 and D10 must be bridged.
  • Grounding pin D10 ensures proper injector operation.
  • All ECUs are identical; the only variation is the calibration month.

Component Details

Processor

  • Core component managing ECU operations.

Mencal (Calibration Memory)

  • Stores calibration parameters for ECU operation.

5V Regulator (34992) – 15 Pins

  • Regulates voltage supply to essential ECU components.

Delco 169 E (PF Relay and V1 Fan Control)

  • Delco 169 E – 1: Handles PF relay, injection light, computer board, and V2 fan (15 pins).
    • Input (Trigger): Negative
    • Output: Negative
  • Delco 169 E – 2: Controls V1 fan and heater relay collector.

Stepper Motor Drive (34993) – 9 Pins

  • When ignition is turned off, the ECU runs an automatic stepper motor test.
  • Diagnosis can be performed using an oscilloscope by toggling the ignition.


Pump Relay Drive and Injector Drive

  • Critical components for fuel system operation.