EDI DIAGNOSIS SERVICE MANUAL NUMBER 22
Page 5E-42 90-860074--1 FEBRUARY 2002
Battery Voltage
Scan Code: P1600
Blink Code: 1233
Malfunction Indicator Lamp: OFF
72965
CIRCUIT DESCRIPTION:
If battery voltage drops below 9 volts the Instrumented Injector (needle movement sensor)
stops working. If the battery voltage drops below 6 - 9 volts the fuel quantity actuator begins
to work improperly. The ECM stops working when the battery voltage drops below 6 volts.
However, the diagnostic system will not recognize a low voltage problem. The only error
recognized by the ECM is if the battery voltage is too high (above 20 volts).
DIAGNOSTIC HELP:
Verify the following:
• Alternator drive belt or belt tension improper.
• Open in the battery supply (+) or ground (–) circuits.
• Defective alternator.
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