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HOMESERVICE MANUALSMAZDA1991626 L4-2184CC 2.2L SOHC F2REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULETESTING AND INSPECTIONWITH MANUAL TRANSAXLE (MTX)
1991 Mazda 626 L4-2184cc 2.2L SOHC F2

With Manual Transaxle (MTX)

1991 Mazda 626 L4-2184cc 2.2L SOHC F2SECTION With Manual Transaxle (MTX)

ECU Testing (M/T):






The Mazda Engine Signal Monitor (#49 9200 162) is utilized to check ECU terminal voltages. This tool inspects individual terminal voltages as selected with the monitor switch. A high impedance volt/ohm meter can also be used to check these voltages. Aftermarket test units are available that will read ECU terminal voltages when connected with proper adapters.

To use the Engine Signal Monitor, connect unit between ECU and wiring harness with the correct adapter (#49 G018 903). Use connector "A" of the adapter on manual transmission models. Place pin number cover sheet (#49 G018 904) on monitor face. Turn select and monitor switches to the desired terminal number for a voltage readout. Conduct tests with engine at operating temperature unless instructed otherwise.

CAUTION: Never apply voltage to terminals "A" and "B."

ECU TESTING PRECAUTIONS

1. Never push circuit tester probes into connectors from ECU side.
2. Before replacing an ECU, check components, wiring harnesses and terminal contacts if terminal voltage readings are incorrect. Repair as needed and recheck voltage readings.

ECU PIN VOLTAGE CHART

PART 1

ECU Pin Voltage Chart (Part 1):






PART 2

ECU Pin Voltage Chart (Part 2):






PART 3

ECU Pin Voltage Chart (Part 3):






RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.