EDI DIAGNOSIS
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002 Page 5E-25
TEST DESCRIPTION
Verify continuity between the following:
ECM 68 PIN CONNECTOR
7 TERMINAL CONNECTOR AT FUEL IN-
JECTION PUMP
33 5
63 6
Verify the sensor resistance between terminals 5 and 6 of the injection pump connector as
a function of temperatures:
TEMPERATURE
°C° (F)
RESISTANCE
(kOhm)
–10 (13) 8.29 - 10.61
20 (67) 2.28 - 2.72
50 (122) 0.751 - 0.901
80 (175) 0.291 - 0.353
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.
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