Inspecting The Ignition System - Daikin GYEQ20AN Service Manual

SiAUY361411EA
1.5

Inspecting the Ignition System

∗ This should be tested approximately 10 minutes after stopping (because the voltage
1. Using a tester, check if the output voltage requirements specified above are met.
2. If the voltage is significantly different than specified above, stop the system using the
3. If the harnesses and connectors are OK, then check each component.
• With the engine running, clip the plug cord of cylinder No.1 with the timing light clip. The timing
• Check the ignition timing of other cylinders by repeating this procedure.
[If the ignition timing significantly differs:]
• Check the crank pulse sensor and cam pulse sensor for any gap; the harnesses and
• Make sure that the main CPU is correct for the current model.
[If the timing light fails to flash:]
If no problems are found after checking the above, replace the main circuit board and/or power
supply circuit board.
Parts Inspection
Output voltage
Parts to inspect
Primary side
Ignition
power
Secondary
supply
side
immediately after stopping will be the same as while running).
onboard checker and wait for 5 minutes; then, with the power OFF, check the harness for
continuity and the junction connectors for contact failure using a tester.
Inspecting the ignition timing
light will begin flashing. Point the flashing light to the flywheel circumference and you will be
able to determine the ignition timing of cylinder No.1 based on the position where the flywheel
tick mark comes to rest.
connectors for contact failure; and the signal lines for any noise due to their overlap with the
power supply lines.
Measuring points
Between starter transformer's
input terminals
Between main circuit board's
CN20-5 and -6
Between power supply circuit
board's CN105-1 and -3
Between power supply circuit
board's CN107-1 and -2
Clip the ignition coil plug
cord.
Point the timing light to
the flywheel circumference.
Inspecting the Outdoor Unit
During While system is running
system (with actuator check
∗
stop CH1 ON)
0 V 200 V AC
0 V 14 V DC
0 V 14 V AC
0 V 14 V DC
bTDC40°
bTDC10°
TDC
025944-00E
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