92 3 DIAGNOSTIC SOFTWARE OPERATION
WARNING: To avoid serious personal injury,
possible death or damage to the engine or
vehicle, read all safety instructions in the “Safety
Information” section of this manual.
NOTE: Batteries must be fully charged before doing
this test. Use battery char ger during th is t est, if
multiple tests are needed; battery drain c an be
extensive .
NOTE: Read and be familiar with all steps and time
limits in this procedure before starting.
Figure 102 Relative Compression test
1. Select Diagnostics from the menu bar.
2. Select Relative Compression Tests from the drop
down menu .
3. Follow the messages at the bottom of the w indow.
• Turn the ignition switch to ON.
• Select Run.
WARNING: To avoid serious injury,
possible death, or damage to the engine or
vehicle, after clicking Run, turn the ignition
switch, w ithin 5 seconds, to crank the engine;
if not done in 5 seconds, the IDM will cancel
the test and the engine will start.
• Within 5 seconds of selecting run, crank
engine for 15 seconds. Another m essage
will read Stop Cranking within 5 seconds.
Do not turn the ignition switch to OFF. If
the ignition switch is turned to OFF, test
results will be lost.
NOTE: If test results are identical to previous test
results, the current test failed and the previous
results were displayed.
4. Interpret results.
• If a Relative C ompression test and Injec tor
Disable test identify a suspect cylinder, check
for a mechanical problem.
• If a Relative Compression test does not
identify a suspect cylinder, but the Injector
Disable test does, re p lace suspect injector(s).
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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