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.
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HOMESERVICE MANUALSSUZUKI1990SWIFT GTREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES
1990 Suzuki Swift GT
Engine Controls - Tests W/Codes
1990 Suzuki Swift GTSECTION Engine Controls - Tests W/Codes
- Introduction
- Self-Diagnostic System
- ECM Location
- Summary
- Diagnostic Trouble Code Definitions
- Diagnostic Code Charts (DOHC)
- Initial Diagnostic Procedure (DOHC)
- Chart A1 - ECM Power Supply & Ground Circuit Check (DOHC)
- Chart A2 - Check Engine Light Inoperative (DOHC)
- Chart A3 - Check Engine Light Stays On - Won't Flash (DOHC)
- Code 13 - Oxygen Sensor Circuit (DOHC)
- Code 14 - Coolant Temp Sensor (Cts) Indication Low (DOHC)
- Code 15 - Coolant Temp Sensor (Cts) Indication High (DOHC)
- Code 21 - Throttle Position Sensor Voltage High (DOHC)
- Code 22 - Throttle Position Sensor Voltage Low (DOHC)
- Code 24 - Speed Sensor Circuit Check (DOHC)
- Code 33 - Airflow Sensor (AFS) CKT Signal Voltage High (DOHC)
- Code 34 - Airflow Sensor (AFS) CKT Signal Voltage Low (DOHC)
- Code 41 - No Ignition Signal (DOHC)
- Code 42 - Crank Angle Sensor (CAS) Circuit Check (DOHC)
- Code 51 - EGR System Circuit Check - CALIF. Only (DOHC)
- Code 52 - Fuel Injector Check - CALIF. Only (DOHC)
- Diagnostic Code Charts (SOHC)
- Initial Diagnostic Procedure (SOHC)
- Chart A1 - ECM Power Supply & Ground Circuit Check (SOHC)
- Chart A2 - Check Engine Light Inoperative (SOHC)
- Chart A3 - Check Engine Light Stays On - Won't Flash (SOHC)
- Code 13 - Oxygen Sensor Circuit (SOHC)
- Code 14 - Coolant Temp Sensor (Cts) Indication Low (SOHC)
- Code 15 - Coolant Temp Sensor (Cts) Indication High (SOHC)
- Code 21 - Throttle Switch - M/T (SOHC)
- Code 21 - Throttle Position Sensor Voltage High - A/T (SOHC)
- Code 22 - Throttle Position Sensor Voltage Low - A/T (SOHC)
- Code 23 - Air Temp Sensor (ATS) Signal Voltage High (SOHC)
- Code 24 - Speed Sensor Circuit Check (SOHC)
- Code 25 - Air Temp Sensor (ATS) Signal Voltage Low (SOHC)
- Code 31 - Pressure Sensor (PS) Signal Voltage Low (SOHC)
- Code 32 - Pressure Sensor (PS) Signal Voltage High (SOHC)
- Code 41 - No Ignition Signal (SOHC)
- Code 51 - EGR System Circuit Check - CALIF. Only (SOHC)
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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.