EDI DIAGNOSIS
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002 Page 5E-45
ECM Reference Voltage (u_ref - 2.5v)
Scan Code: P161A
Blink Code: 1234
Malfunction Indicator Lamp: OFF
75343
CIRCUIT DESCRIPTION:
As part of self-diagnosis the ECM is capable of determining if failures have occurred to the
reference voltage circuits within the ECM. If defects exists the ECM sets a Scan Code 161A.
DIAGNOSTIC HELP:
Verify the following:
• Replace the ECM.
Recognition by the ECM of a Reference Voltage fault influences engine performance as
follows:
• No loss of power.
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