GDI ± Troubleshooting
13A-70
INSPECTION PROCEDURE 33
Stop lamp switch system
Probable cause
The engine-ECU determines whether the brake pedal is depressed or not, by means
of the stop lamp switch input signal.
D Malfunction of the stop lamp switch
D Open circuit or short-circuited harness wire in the
stop lamp circuit, or poor connector contact
D Malfunction of the engine-ECU
NG
NG
NG
Repair
Check the stop lamp switch. (Refer to GROUP 35 ± Brake Pedal.)
NG
Replace
OK
Measure at stop lamp switch connector C-04.
D Disconnect the connector, and measure at the harness side.
D Voltage between terminal 2 and earth
OK: System voltage
NG
Check the following connector: C-29
OK
Check trouble symptom.
Check the harness wire between the battery and stop lamp switch.
NG
Repair
OK
Measure at engine-ECU connector C-18.
D Disconnect the connector, and measure at the harness side.
D Voltage between terminal 63 and earth
(Ignition switch: ON)
OK: 0 ± 3 V (when the brake pedal is not depressed)
System voltage (when the brake pedal is depressed)
NG
Check the following connectors: C-02, C-04, C-28
OK
Check trouble symptom.
Check the harness wire between the engine-ECU and stop lamp,
and repair if necessary.
OK
Check the following connector: C-18
NG
Repair
OK
Check trouble symptom.
NG
Replace the engine-ECU.
INSPECTION PROCEDURE 34
Small lamp switch
Probable cause
The engine-ECU determines whether the small lamp switch is on or off.
According to that information, the engine-ECU controls
alternator output current when the vehicle is started.
D Improper connector contact, open circuit or
short-circuited harness wire in the taillamp relay
circuit
D Malfunction of the engine-ECU
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Check the following connector: C-19
NG
Repair
Measure at the engine-ECU connector C-19.
D Disconnect the connector, and measure at the harness
side.
D Voltage between 88 and earth
(Lighting switch: ON)
OK: System voltage
NG
Check the taillamp relay circuit. (Refer to ELECTRICAL WIRING.)
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