7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 511
4. If code is active, do step 6 and 7 to check circuit
for the MAT sensor using the following table.
• Circuit C he cks for MAT Sens or
5. If code is inactive, wiggle connectors and wires
at all suspected problem locations. If circuit
continuity is inte rrup te d, the EST will d isp lay
DTCs related to the condition.
6. Disconnect engine harness from temperature
sensor.
NOTE: Inspect connectors for damaged pins,
corrosion, or loose pins. Repair if necessary.
7. Connect Temperature Sensor Breakout Harness
to engine harness only.
Circuit Checks for MAT Sensor (Use EST, breakout harness, 3-Banana Plug Harness, and 500 Ohm
Resistor Harness.)
Test Condition Spec Checks
Sensor disconnected
>4.58V
If voltage < 4.58 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 > 0.098 V, check ground and signal circuit for
open or high resistance. Use a breakout box and measure
resistancefromPin1toPinX1–6andfromPin2toX2–14
(spec < 5 Ω).
500 Ohm Resistor Harness
connected between Pin 2
(Green) and Pin 1 (Black) of
breakout harness
<1.0V
If voltage > 1.0 V, check signa l 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 MAT 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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