Troubleshooting The Power Unit; Troubleshooting The Power Unit Using The Ydis - SELVA MARINE Grey Whale 200 EFI Service Manual

Troubleshooting the power unit

NOTE:
• Before troubleshooting the outboard motor, make sure that fresh fuel of the specified type has
been used.
• Check the trouble code using the YDIS (or diagnostic flash indicator B) first, and then check the
electronic control system follow the trouble code chart.
• When a three-digit trouble code is detected, check the data logger of the ECM record data graph
as well.
• It is recommended to use the YDIS for troubleshooting, it is not enough to check the electronic
throttle valve system (electronic throttle valve, TPS, and accelerator position sensor) when only
using diagnostic flash indicator B.
• If a trouble code is not detected, check the power unit according to "Troubleshooting the power
unit (trouble code not detected)."
• Before using the YDIS or diagnostic flash indicator B to check the power unit, check the ECM cir-
cuit. To check the ECM circuit, see Chapter 8, "Checking the ECM circuit."
• Be sure to check that the couplers and connectors are securely connected.
• When deleting the diagnosis record on the YDIS, be sure to check the time that the trouble codes
were detected.
• When checking the input voltage of a part, the coupler or connector must be disconnected. As a
result, the ECM determines that the part is disconnected and a trouble code is detected. There-
fore, be sure to delete the diagnosis record after checking the input voltage.
• Since the main relay comes on for approximately 10 seconds after the start switch is turned to
"OFF," the power of the ECM cannot be turned off. Therefore, if the start switch is turned to "ON"
within 10 seconds after it was turned to "OFF," the trouble codes cannot be deleted.

Troubleshooting the power unit using the YDIS

NOTE:
• Use the trouble codes displayed by the YDIS to check each part according to the "Trouble code
and checking step" table.
• Delete the trouble codes after checking, repairing, or replacing a part and check that the trouble
codes are not detected again. If the same trouble codes are detected, the ECM may be faulty.
• Check the items listed in the table, if all the items are in good condition delete the trouble code,
and then check the trouble codes again. If the same trouble codes are detected again, the ECM is
faulty.
• A breakdown of the engine symptoms are described in the table below, however, multiple mal-
functions that have been duplicated cannot be limited to these items. The symptoms may change
according to the operating conditions and other conditions.
6AL3J11
YDIS / Troubleshooting the power unit
9
1
2
3
4
5
6
7
8
9
9-6