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.