EDI DIAGNOSIS SERVICE MANUAL NUMBER 22
Page 5E-62 90-860074--1 FEBRUARY 2002
Fuel Shut Off Valve [EAB (Electrical Shut Off)]
Scan Code: P1660
Blink Code: 1221
Malfunction Indicator Lamp: ON
75409
ECM
53
YEL
a
b
c
a-Fuel Injection Pump
b-Fuel Shut Off Valve
c-ECM Controlled12 Volt Power Supply
CIRCUIT DESCRIPTION:
As a safety feature the engine is equipped with a Fuel Shut Off Valve (Electrical Shut Off).
This valve is a redundant method of stopping the engine. In case of a defect in a part or parts
of the EDI system, which would prevent the engine from stopping, the ECM can energize
this valve to positively stop the flow of fuel. This valve is similar as on the previous Indirect
Injection systems but is controlled by the ECM. A 12 volt current is supplied to CKT Pin 53
which energizes the valve and stops the flow of fuel to the injectors when required.
A failure in the Fuel Shut Off Valve circuit should set a Scan Code P1660.
CKT PIN
NAME
53 Fuel Shut Off Valve
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