Daewoo G15S-2, G18S-2, G20SC-2 Plus, GC15S-2, GC18S-2 Service Manual

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LIFT TRUCK SERIES

May 7,

2004

G15S-2 G18S-2 G20SC-2 Plus

CODE

7500

GC15S-2 GC18S-2 GC20SC-2 Plus

LT7500-E4

 

GC20E-3 GC25E-3 GC30E-3 GC32E-3 Plus

 

G20E-3 G25E-3 G30E-3 G32E-3 Plus

 

GC20P-3 GC25P-3 GC30P-3 GC32P-3 Plus

 

G20P-3 G25P-3 G30P-3 G32P-3 G33P-3 Plus

 

G35S-2 G40S-2 G45S-2 G50SC-2 Plus

 

G50S-2 G60S-2 G70S-2 Plus

 

SUBJECT: TIER II FUEL SYSTEM FAULT CODES AND MANUALS

Daewoo recently published Service Bulletin LT7500-D4 to announce the availability of theTier II Engine Analyzer Tool Kit. Daewoo strongly recommends that each dealership and branch have one or more kits. Fortunately, the fuel systems also have built-in fault code diagnostics that do not require the service tool. This diagnostic system is designed for very simple troubleshooting when a service tool and computer are not available. Daewoo considers this a user-friendly advantage over much of the competition with the new Tier II fuel systems.

Applicable Daewoo serial number prefixes: FQ, FR, FY, G2, G3, G4, G5, G6, G9, GA,

GB, GH, GQ. These trucks say “Plus” on the side near the model number.

Diagnostics

The Check Engine light, found on the steering column dashboard under the steering wheel, is used to display the flashing diagnostic fault codes. This is also called the Malfunction Indicator Lamp (MIL). See Figure 1 on the next page. When the ignition key is turned to the “ignition” position the light comes on. The light goes out after the engine starts unless an active fault has been detected. When that happens the light remains on until the fault is cleared. The fault codes are stored in the memory of the Small Engine Control Module (SECM).

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Daewoo G15S-2, G18S-2, G20SC-2 Plus, GC15S-2, GC18S-2 Service Manual

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Figure 1: MIL or “check engine” light location on dash.

Check Engine light

Displaying the fault codes:

To display the fault codes:

1.Turn the ignition key on without cranking the engine.

2.Depress the accelerator pedal to the floor three times within five seconds.

Clearing the fault codes:

To clear the fault codes:

1.Turn the ignition key on without cranking the engine.

2.Depress the accelerator pedal to the floor ten times within five seconds.

Note: Do not clear the codes until the faults have been diagnosed and corrected.

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