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 GL, 2D Hatchback, AutomaticFACTORY 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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