Actron Ford Code Scanner CP9015 - Manual (Page 39)

39
MCU SYSTEM
Using the Code Scanner (MCU Systems)
Complete Description for Reading and Using Service Codes
Do This First
This section shows you how to use the
Code Scanner for:
• Running tests of the engine computer
system.
• Reading service codes to pinpoint
problem causes.
Before using this section:
— Read Sections 1 and 2 to learn about
service codes and the Code Scanner
tool.
— Read Section 3 to find the location of
the Self- Test connector in your
vehicle. The connector type will tell
you whether you have an MCU
system or an EEC-IV system.
— Read this section (7) if you have an
MCU system. Use Section 4 if you
have an EEC-IV system.
Self-Test Summary
The Self-Test procedure (also called
“Quick Test”) involves engine off and
engine running tests.
The entire procedure is summarized
below. Each part is fully explained on
the following pages. IMPORTANT: All
parts must be performed as shown for
accurate test results!
Self-Test Summary
Part 1: Test Preparation.
• Safety First! Follow all safety rules.
• Perform Visual Inspection. This often
reveals the problem.
• Prepare Vehicle. Check choke voltage
and warm-up engine.
Part 2: Do Key On Engine Off
(KOEO) Self-Test.
• Get service codes to help pinpoint
problems.
Part 3: Do Key On Engine
Running (KOER) Self-Test.
• Get more service codes to pinpoint
problems found during engine
operating conditions.
Self-Test Part 1:
Test Preparation
1) Safety First!
• Set the parking brake.
• Put shift lever in PARK (automatic
transmission) or NEUTRAL (manual
transmission).
• Block the drive wheels.
• Make sure ignition key is in OFF
position.
2) Perform Visual Inspection.
Doing a thorough visual and “hands-
on” underhood inspection before
starting any diagnostic procedure is
essential!! You can find the cause of
many drivability problems by just
looking, thereby saving yourself a lot
of time.
• Has the vehicle been serviced