GENERAL SYSTEM DIAGNOSTICS
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999
Page 5E-55
TEST DESCRIPTION:
Number(s) below refer to the Step number(s) on the Diagnostic Table:
1. The MIL should be “ON” steady with the ignition “ON,” engine “OFF.” If not, chart A-1
should be used to isolate the malfunction.
2. Checks the serial data circuit and ensures that the ECM is able to transmit serial data.
3. If the engine will not start, chart A-3 should be used to diagnose the condition.
5. A scan tool parameter which is not within the typical range may help to isolate the area
which is causing the problem.
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