Mercury MerCruiser D2.8L D-Tronic Service Manual page 593

SERVICE MANUAL NUMBER 22
TEST DESCRIPTION
Verify continuity between the following:
Verify the sensor resistance between terminals 5 and 6 of the injection pump connector as
a function of temperatures:
DIAGNOSTIC HELP:
Verify the following:
•
Open or short in the CKT Pin 33 or CKT Pin 63.
•
Bent terminal or pin at the fuel pump connector or ECM.
•
Defective fuel injection pump (temperature sensor circuit) or ECM.
Fuel Temperature Sensor failure influences engine performance as follows:
•
FUEL QUANTITY ACTUATION: No fuel quantity correction can occur as a function
of fuel temperature. When sensor is functioning the engine has the same
performance for all fuel temperatures. With this sensor failure the engine has better
performance with a cold fuel condition then when the fuel is warm.
•
Unless there is a complaint about performance, it is not necessary to change the
injection pump for this failure.
90-860074--1 FEBRUARY 2002
ECM 68 PIN CONNECTOR
33
63
TEMPERATURE
°C° (F)
–10 (13)
20 (67)
50 (122)
80 (175)
7 TERMINAL CONNECTOR AT FUEL IN-
JECTION PUMP
5
6
RESISTANCE
(kOhm)
8.29 - 10.61
2.28 - 2.72
0.751 - 0.901
0.291 - 0.353
EDI DIAGNOSIS
Page 5E-25