GENERAL SYSTEM DIAGNOSTICS
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 5E-23
MEFI 2 - ECM Connector Chart For 7.4L MPI
The following chart will aid in diagnosis of symptoms. These voltages were derived from a
known good engine. The voltages shown were done with the electrical system intact and
operational. These are voltage requirements to operate the different circuits.
CAUTION
Do not attempt to obtain these voltages by probing wires and connectors. Serious
damage could result in loss of engine operation or wiring damage. Voltages can
vary with battery conditions.
J-1
a
b
J-1 Front 32 Pin Input Connector
J-2
a
J-2 Rear 32 Pin Output Connector
a-Shaded Area Denotes Pin Connector Location Used On Terminal
b-Early Models Use Pin J1-4 and Later Models Use Pin J1-6.
IMPORTANT: The following conditions must be meet before testing.
1. Engine at operating temperature.
2. Ignition on or engine running.
3. Scan tool not connected.
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