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202
NOTE: When using the EST to do KOEO or KOER
diagnostic tests, Standard Test is always selected
and run first. If the ignition switch is not cycled, the
Standard Test does not have to be run again.
8. From the KOEO Diagnostics menu, select Glow
Plug/Inlet Air Heater, then select Run to start the
test.
9. Record results on Diagnostic Form.
•
If both relays are not operational, confirm that
the ECM is programmed and enabled for the
Inlet Air Heater.
•
If both relays are not operational and the
ECM programming is correct, do the following
checks in "IAH System" – Section 7:
— Actuator Voltage Checks at ECM (page
449)
— Harness Resistance Checks – Relay to
ECM (page 450)
— Harness Resistance Checks – Relay to
12–pin Connector (page 450)
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
5 HARD START AND NO START DIAGNOSTICS
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
•
If voltage is not B+, do the following checks in
"IAH System" – Section 7:
— Harness Resistance Checks – Relay to
ECM (page 450)
— Harness Resistance Checks – Relay to
12–pin Connector (page 450)
If the control circuit wiring to the relay is
correct, replace relay.
•
If voltage is B+, verify previous test results.
Check wiring from the relay to element.
The wiring may have continuity and low
resistance.
connector, or corrosion could prevent ability
to handle circuit load.
Possible Causes
•
Failed wiring harness or connection
•
Poor ground connection
•
Failed relay
•
Failed element
•
Failed ECM
•
ECM not programmed (inlet air heater)
EGES-270-1
However, a poor crimp, loose
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