7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 395
Circuit Checks for ECT S ensor (Use EST, breakout harness, 3-Banana Plug Harness, an
d500Ohm
Resistor Harness.)
Test Condition Spec Checks
Sensor disconnected
>4.6V
If voltage < 4.6 V, check signal circuit for short to ground.
3-Banana Plug Harness connected
between Pin 2 (Green) and Pin 1
(Black) of breakout harness
0V
If voltage is > 0.127 V, check ground and signal circuit
for open or high resistance. Use a breakout box and
measure resistance from Pin 1 to Pin X1–6 and from
Pin2toX1–8(spec<5Ω).
500 Ohm Resistor Harness
connected between Pin 2 (Green)
and Pin 1 (Black) of breakout
harness
<1.0V
If voltage > 1.0 V, check signal circuit for short to V
REF
,
B+, or another sensor’s signal voltage.
Connect engine harness to sensor. Use the EST to clear DTCs. If an active code remains after
checking test conditions, replace the ECT sensor.
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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