DIAGNOSTIC MANUAL
Step
Action
Decision
19
Perform Standard Test to verify all engine systems are operating
as designed. Verify engine coolant temperature is greater than
158°F (70°C). Using EST with ServiceMaxx software, go to Tests >
KOER Tests > Standard Test.
Does Standard Test run and pass?
Yes: Go to step 20
No: Diagnose and repair active
fault code(s) (See Electronic
Control System Diagnostics
section in Engine Diagnostic
Manual).
Step
Action
Decision
20
Perform the following MAF Sensor Calibration procedure to
accommodate for system repairs:
1.
Verify engine coolant temperature is greater than
180°F (82°C), and lube oil temperature is greater than
176°F (80°C).
2.
Using EST with ServiceMaxx software, go to Tests >
and deselect Load Test Specific Session.
3.
Go to Sessions > Performance and select the record
snapshot icon from the toolbar.
4.
Go to procedures > KOER Procedures > MAF Sensor
Calibration.
5.
After MAF Sensor Calibration is complete, stop
recording.
6.
Turn the ignition switch to the OFF position for a
minimum of 30 seconds.
7.
Repeat steps 3 through 5 to complete second MAF
Sensor Calibration.
Does MAF Sensor Calibration procedure run and pass?
Yes: Diagnostics complete
No: Go to Performance
Diagnostics section in Engine
Diagnostic Manual.
43
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