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

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LIFT TRUCK SERIES

G15S-2 G18S-2 G20SC-2 Plus
GC15S-2 GC18S-2 GC20SC-2 Plus
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

May 7, 2004

CODE 7500

LT7500-E4

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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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.

Check Engine light

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