Operational Diagnostics; Tests Using Masterdiagnostics; Vref; Temperature Sensor Tests Using Masterdiagnostics - Navistar International DT 466 Diagnostic/Troubleshooting Manual

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS

Operational Diagnostics

Operational Diagnostic
MasterDiagnostics® Continuous
For help, see "Diagnostic Software Operation"
in Section 3 (page 68) for procedure to run the
Continuous Monitor Test.
V Tests using MasterDiagnostics®
REF
1. Plug the Electronic Service Tool (EST) tool into
the American Trucking Association (ATA) datalink
connector and start MasterDiagnostics®.
2. Disconnect sensor to be tested.
3. Connect breakout harness to harness only.
4. Turn the ignition switch to ON.
5. Monitor signal voltage with the EST using
continuous monitor session and initiating KOEO
Continuous Monitor Test.
Voltage should be near 0, unless the signal circuit
is shorted or incorrectly wired to V
voltage sources. See Circuit Diagnostics in this
section for sensor specifications.
6. Use a Digital Multimeter (DMM) to verify V
at BLUE pin (V ) in breakout harness (voltage
REF
should be 5 V ± 0.5 V). Connect positive to BLUE
and negative to chassis ground.
If voltage is greater than 5.5 V, check V
to B+.
If voltage is less than 4.5 V, check V
short to ground.
7. Install 500 ohm harness between GREEN (signal
circuit), and BLUE (V
Monitor signal voltage with EST.
If voltage is less than 4.5 V, check signal circuit for
open or short to ground.
8. Use a DMM to check resistance from BLACK pin
(signal ground) of breakout harness to chassis
ground.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
tests use
Monitor Test.
, B+, or other
REF
for short
REF
for open or
REF
) pin of breakout harness.
REF
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
If resistance is greater 5 ohm, check for open
or high resistance between ECM and sensor
the
connector.
9. Connect engine or chassis harness to sensor.
10. Use the EST to clear DTCs.
If an active DTC remains after checking test
conditions, replace sensor.
Temperature Sensor Tests using
MasterDiagnostics®
1. Plug the Electronic Service Tool (EST) tool into the
ATA connector and start MasterDiagnostics®.
2. Disconnect sensor to be tested.
3. Connect breakout harness to harness only.
4. Turn the ignition switch to ON.
5. Monitor signal voltage with the EST using
continuous monitor session and initiating KOEO
Continuous Monitor Test (voltage should be
greater than 4.6 V). See Circuit Diagnostics in
this section for sensor specifications.
If voltage is less than 4.6 V, check signal circuit for
REF short to ground.
If voltage is greater than 5.5 V, check signal circuit
for short to B+.
6. Install 3–Banana plug harness between GREEN
(signal circuit), and BLACK (signal ground) pin of
breakout harness.
If voltage is more than 0.127 V, check ground
circuit for open or high resistance.
Circuit Diagnostics in this section for sensor
specifications.
7. Remove 3–Banana plug harness.
8. Connect engine or chassis harness to sensor.
9. Use the EST to clear DTCs.
If an active DTC remains after checking test
conditions, replace sensor.
EGES-270-1
289
See