Map Operational Diagnostics - Navistar International DT 466 Diagnostic/Troubleshooting Manual

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS

MAP Operational Diagnostics

WARNING: To avoid serious personal injury,
possible death, or damage to the engine or vehicle
– comply with the following:
Be careful to avoid rotating parts (belts and fan)
and hot engine surfaces.
1. Using EST, open the D_ContinuousMonitor.ssn.
Figure 485 Continuous Monitor Test
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
2. To monitor signal voltage, run KOEO Continuous
Monitor Test. For help, see "Continuous Monitor
Test" in Section 3 (page 68).
3. Monitor MAP signal voltage. Verify an active DTC
for the MAP circuit.
4. If code is active, do step 6 and 7 to check circuit
for the MAP sensor using the following table.
•
5. If code is inactive, wiggle connectors and wires
at all suspected problem locations.
continuity is interrupted, the EST will display
DTCs related to the condition.
6. Disconnect engine harness from pressure sensor.
NOTE: Inspect connectors for damaged pins,
corrosion, or loose pins. Repair if necessary.
7. Connect Pressure Sensor Breakout Harness to
engine harness only.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
Circuit Checks for MAP Sensor
503
If circuit