Fuel Temperature Sensor - Mercury MerCruiser D2.8L D-Tronic Service Manual

EDI DIAGNOSIS

Fuel Temperature Sensor

Scan Code:
Blink Code:
Malfunction Indicator Lamp:
CIRCUIT DESCRIPTION:
The Fuel Temperature Sensor is a thermistor (a resistor which changes value based on
temperature). Low temperature produces a high resistance, while high temperature causes
a low resistance.
The ECM supplies a 5 volt signal to the sensor through a resistor in the ECM and measures
the voltage. The ECM voltage will be high when the fuel temperature is cold, and low when
the fuel temperature is hot.
A failure in the Fuel Temperature Sensor circuit should set a Scan Code P0180.
33
63
Page 5E-24
a
7
6
1
5
2
4
3
75565
a - Fuel Temperature Sensor (Inside Fuel Injection Pump)
b - 5 Volt Reference Signal
c - Fuel Temperature Sensor Signal
d - Sensor Ground
CKT PIN
Sensor Ground (Analog –)
Fuel Temperature Sensor Signal
SERVICE MANUAL NUMBER 22
P0180
3333
OFF
BLU/RED
BRN/PUR
NAME
90-860074--1 FEBRUARY 2002
ECM
c
b
63
d
33
75409