ECM SYSTEM
WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
1-23
Hesitation, Sag, Stumble
Checks
Action
DEFINITION: The vehicle has a momentary lack of response when depressing the accelerator. The condition can occur at any vehicle speed.
The condition may cause the engine to stall if it’s severe enough.
Preliminary Checks
• Refer to Important Preliminary Checks.
• Check the battery condition.
• Check the positive and negative cable connections.
• Check the ECM and system grounds for corrosion at the connectors.
• Check the coil electrical connections.
• Check the air filter for restriction.
Fuel System Checks
• Check the fuel pressure. Refer to LPG / Natural Gas Fuel System Diagnosis.
• Check for low fuel pressure, during a moderate, or full throttle acceleration. If the fuel pressure
drops below specification, there is a possibility of a faulty low pressure regulator, or a restriction, in
the fuel system.
• Check the Manifold Absolute Pressure (MAP) sensor response and accuracy.
• Check LPL electrical connection.
• Check the mixer air valve for sticking or binding.
• Check the mixer module assembly, for proper installation and leakage.
Ignition System Checks
NOTE
•
LPG / natural gas, being a gaseous fuel, requires higher secondary ignition system
voltages, for the equivalent gasoline operating conditions. If a problem is reported on LPG
/ natural gas, and not gasoline, do not discount the possibility of a LPG / natural gas only,
ignition system failure, and test the system accordingly.
• Check for proper ignition output voltage, with spark tester.
• Verify that the spark plugs are correct, for use with LPG / natural gas.
• Check for fouled spark plugs.
Additional Check
• Check for manifold vacuum, or air induction, system leaks.
• Check the generator, output voltage.
Backfire
Checks
Action
DEFINITION: The fuel ignites in the intake manifold, or in the exhaust system, making a loud popping noise.
Preliminary Check
• Refer to Important Preliminary Checks.
Ignition System Checks
IMPORTANT
•
LPG / natural gas, being a gaseous fuel, requires higher secondary ignition system
voltages, for the equivalent gasoline operating conditions. The ignition system must be
maintained in peak condition, to prevent backfire.
• Check for the proper ignition coil output voltage, using the spark tester.
• Check the connection, at each ignition coil.
• Check the spark plugs.
• Remove the plugs, and inspect them, for the following conditions:
–
Wet plugs
–
Cracks
–
Wear
–
Improper gap
–
Burned electrodes
–
Heavy deposits
Engine Mechanical Check
IMPORTANT
•
The LPG / Natural Gas Fuel system, works on a fumigation principle, of fuel introduction,
and is more sensitive to intake manifold leakage, than a gasoline fuel supply system.
• Check the engine for the following:
–
Improper valve timing
–
Engine compression
–
Manifold vacuum leaks
–
Intake manifold gaskets
–
Sticking or leaking valves
–
Exhaust system leakage
• Check the intake and exhaust system, for casting flash or other restrictions.
Fuel System Checks
• Perform a fuel system diagnosis. Refer to LPG / Natural Gas Fuel System Diagnosis.
KiSC issued 12, 2016 A
Summary of Contents for WG1605-E3
Page 1: ...WG1605 E3 DIAGNOSIS MANUAL ECM SYSTEM KiSC issued 12 2016 A...
Page 3: ...I INFORMATION KiSC issued 12 2016 A...
Page 4: ...CONTENTS 1 SAFETY FIRST I 1 INFORMATION KiSC issued 12 2016 A...
Page 8: ...1 ECM SYSTEM KiSC issued 12 2016 A...
Page 10: ...23 Spark Coil Primary DTC 2300 2301 2303 2304 2306 2307 2309 2310 1 228 KiSC issued 12 2016 A...
