9929758 R01 - 2019 TAYLOR-DUNN G-100 Service Manual
© Copyright TAYLOR-DUNN
4.33
EFI DIAGNOSTICS
SERVICE NOTES - FUEL SYSTEM
For more convenient and accurate testing of EFI
components, it is recommended dealers utilize the Digital
Wrench® Diagnostic Software (dealer only), or limited
testing may be done manually using procedures
provided.
80% of all EFI problems are caused by wiring harness
connections. Follow a common sense approach when
diagnosing a potential EFI issue:
1. Disconnect harness at suspected sensor connector.
2. Inspect
the
connector
ends
for
damage
or
contamination. If damaged, repair; if contaminated,
clean. Reconnect and check function.
3. If problem persists, perform a sensor bench test (if
applicable) according to sensor requirements.
4. If the sensor bench tests pass, disconnect the
connector at the ECU and perform a continuity check
between the sensor connector and the appropriate
pin at the ECU connector (all connections for that
sensor). Wiring resistance should be less than one
(1) ohm.
5. If the resistance is high (or open), a wiring harness
inspection
is
required
(including
a
thorough
inspection of the ECU connector for contamination or
damage).
6. If the sensor and wiring passes inspection, and
reconnecting the ECU does not resolve the issue, use
a known-good ECU to test for problem resolution.
• Never attempt to service any fuel system component
while engine is running or ignition switch "on".
•
USE CARE
when removing or installing the ECU
connector, as well as all other harness connections on
the unit. Properly connect and disconnect the ECU
harness to minimize damage to the connector pins and
locking mechanism.
• Although every precaution has been taken to prevent
water intrusion failure, avoid direct water or spray
contact with system components.
• Do not disconnect or reconnect the wiring harness
connector to the ECU or any individual components
with the ignition "on." This can send a damaging
voltage spike through the ECU.
• Do not allow battery cables to touch opposite
terminals.
• Never start the engine when the cables are loose or
poorly connected to the battery terminals.
• Never disconnect battery while engine is running.
• Always unplug ECU from the wire harness before
performing any welding on the unit.
TROUBLE CODE DISPLAY (ETC)
NOTE
The diagnostic mode is accessible only when the check
engine MIL has been activated.
Use the following procedure to display diagnostic trouble
codes that were activated during current ignition cycle
causing the MIL to illuminate. Diagnostic trouble codes
will remain stored in the gauge (even if MIL turns off) until
the key is turned off.
1. If the trouble code (s) are not displayed, use the
MODE button to toggle until “CK ENG” displays on
the information display area.
2. Press and hold the MODE button to enter the
diagnostics code menu.
3. A set of three numbers will appear in the information
area.
Summary of Contents for G0-010-00
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