Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1990 Suzuki Swift GTFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Definitions
DIAGNOSTIC TROUBLE CODE DEFINITIONS (DOHC)
| DTC | Description | ||
|---|---|---|---|
| 12 | System Normal | ||
| 13 | Oxygen Sensor Circuit | ||
| 14 | Coolant Temp Sensor (CTS) Indication Low | ||
| 15 | Coolant Temp Sensor (CTS) Indication High | ||
| 21 | Throttle Position Sensor Voltage High | ||
| 22 | Throttle Position Sensor Voltage Low | ||
| 24 | Speed Sensor Circuit Check (DOHC) | ||
| 33 | Airflow Sensor (AFS) CKT Signal Voltage High | ||
| 34 | Airflow Sensor (AFS) CKT Signal Voltage Low | ||
| 41 | No Ignition Signal | ||
| 42 | Crank Angle Sensor (CAS) Circuit Check | ||
| 51 (1) | EGR System Circuit Check | ||
| 52 (1) | Fuel Injector Check | ||
|
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DIAGNOSTIC TROUBLE CODE DEFINITIONS (SOHC)
| CODE | Description | ||
|---|---|---|---|
| 12 | System Normal | ||
| 13 | Oxygen Sensor Circuit | ||
| 14 | Coolant Temp Sensor (CTS) Indication Low | ||
| 15 | Coolant Temp Sensor (CTS) Indication High | ||
| 21 | Throttle Switch - M/T | ||
| 21 | Throttle Position Sensor Voltage High - A/T | ||
| 22 | Throttle Position Sensor Voltage Low - A/T | ||
| 23 | Air Temp Sensor (ATS) Signal Voltage High | ||
| 24 | Speed Sensor Circuit Check | ||
| 25 | Air Temp Sensor (ATS) Signal Voltage Low | ||
| 31 | Pressure Sensor (PS) Signal Voltage Low | ||
| 32 | Pressure Sensor (PS) Signal Voltage High | ||
| 41 | No Ignition Signal | ||
| 51 (1) | EGR System Circuit Check | ||
|
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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