176 5 HARD START AND NO START DIAGNOSTICS
Figure 206 Breakout box
5. Connect leads of the DMM to the following test
points on th e breakout box:
•POSX3–3toNEGX3–7(V
IGN
Pwr)
• POS X4–2 to NEG X3–7 (ECM PWR)
• POS X4–1 to NEG X3–7 (ECM PWR)
6. Crank engine for 20 seconds and measure
voltage.
7. Record the lowest voltage on Diagnostic Form.
• If the voltage is below 7 V, the ECM power
relay may be resetting, resulting from low
voltage and current from the batteries, or
problems in th e ignition circuit a n d power
feed circuit s. S e e “ECM PWR, Electronic
Control Module Power” in Section 7 (page
381).
• If the voltage is above 7 V, continue with Hard
Start and No Start Diagnostic tests.
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any proced ures.
Follow all warnings, cautions, and notes.
©August 2008 Navistar, Inc.
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