HOW TO DIAGNOSE SUZUKI 6 PINS OBD1
Accessing Code
- Trouble codes are displayed by the malfunction indicator lamp (MIL).
- Switch ignition ON.
- Check that MIL illuminates.
- Bridge data link connector (DLC) terminals 1 and 2 Fig. 1 .
- Count MIL flashes. Note trouble codes. Compare with trouble code table.
- If MIL remains illuminated: Suspect faulty engine control module (ECM).
- Each trouble code consists of two groups of one or more flashes.
- A 1 second pause separates each trouble code group.
- A 3 second pause separates each trouble code.
- MIL flash duration: 0,3 second.
- For example: Two 0,3 second flashes – 1 second pause – one 0,3 second flash. Trouble code 21 displayed Fig. 2 .
- Remove bridge wire.
- Switch ignition OFF.
Erasing code
- Ensure ignition switched OFF.
- Disconnect battery earth lead for 60 seconds minimum.
WARNING: Disconnecting the battery may erase memory from electronic units (e.g. radio, clock). Reconnect battery earth lead.
- Run engine until it reaches normal operating temperature.
- Repeat checking procedure to ensure no data remains in ECM fault memory.
NOTE: Battery earth lead removal duration depends on ambient temperature. The lower the temperature the longer the battery earth lead must be removed. The process may not be successful, if the temperature is below 0°C (32°F). Locate a workplace with a higher temperature before attempting to erase trouble codes.
List of OB1 Codes
Trouble code | Fault location | Probable cause |
| 12 | No fault found | – |
| 13 | Heated oxygen sensor (HO2S) – circuit malfunction | Wiring, HO2S, ECM |
| 14 | Engine coolant temperature (ECT) sensor – circuit malfunction | Wiring, ECT sensor, ECM |
| 15 | Engine coolant temperature (ECT) sensor – signal malfunction | Wiring, ECT sensor, ECM |
| 21 | Throttle position (TP) sensor – signal voltage high | Wiring, TP sensor, ECM |
| 22 | Throttle position (TP) sensor – signal voltage low | Wiring, TP sensor, ECM |
| 23 | Intake air temperature (IAT) sensor – circuit malfunction/intermittent voltage high | Wiring, IAT sensor, ECM |
| 24 | Vehicle speed sensor (VSS) – signal malfunction | Wiring, VSS, ECM |
| 25 | Intake air temperature (IAT) sensor – circuit malfunction/intermittent voltage low | Wiring, IAT sensor, ECM |
| 31 | Manifold absolute pressure (MAP) sensor – signal voltage low | Wiring, MAP sensor, ECM |
| 32 | Manifold absolute pressure (MAP) sensor – signal voltage high | Wiring, MAP sensor, ECM |
| 33 | Mass air flow (MAF) sensor – signal voltage high | Wiring, MAF sensor, ECM |
| 34 | Mass air flow (MAF) sensor – signal voltage low | Wiring, MAF sensor, ECM |
| 41 | Ignition fail safe signal – circuit malfunction | Wiring, noise suppressor, ignition control module (ICM), ECM |
| 42 | Crankshaft position (CKP) sensor/camshaft position (CMP) sensor – signal malfunction | Wiring, CKP/CMP sensor, ECM |
| 44 | Closed throttle position (CTP) switch – signal malfunction | Wiring, CTP switch, ECM |
| 45 | Closed throttle position (CTP) switch – signal malfunction | Wiring, CTP switch, ECM |
| 51 | Exhaust gas recirculation (EGR) solenoid – circuit malfunction | Wiring, EGR solenoid, ECM |
| 52 | Injector leak/heated oxygen sensor (HO2S) – circuit malfunction | Wiring, injector/HO2S, ECM |
| Light remains ON | Engine control module (ECM) | ECM |
| Flash code | Fault location | Probable cause |
| 12 | No fault found | – |
| 13 | Heated oxygen sensor (HO2S) – circuit malfunction | Wiring, HO2S, ECM |
| 14 | Engine coolant temperature (ECT) sensor – circuit malfunction | Wiring, ECT sensor, ECM |
| 15 | Engine coolant temperature (ECT) sensor – signal malfunction | Wiring, ECT sensor, ECM |
| 21 | Throttle position (TP) sensor – signal voltage high | Wiring, TP sensor, ECM |
| 22 | Throttle position (TP) sensor – signal voltage low | Wiring, TP sensor, ECM |
| Intake air temperature (IAT) sensor – circuit malfunction/intermittent | ||
| 23 | Wiring, IAT sensor | |
| voltage high | ||
| 24 | Vehicle speed sensor (VSS) – signal malfunction | Wiring, VSS, ECM |
| Intake air temperature (IAT) sensor – circuit malfunction/intermittent | ||
| 25 | Wiring, IAT sensor | |
| voltage low | ||
| 31 | Manifold absolute pressure (MAP) sensor – signal voltage low | Wiring, MAP sensor |
| 32 | Manifold absolute pressure (MAP) sensor – signal voltage high | Wiring, MAP sensor |
| 42 | Crankshaft position (CKP) sensor – signal malfunction | Wiring, CKP sensor, ECM |
| 47 | Camshaft position (CMP) sensor – signal malfunction | Wiring, CMP sensor, ECM |
| 61 | Shift solenoid (SS) A – circuit malfunction | Wiring, shift solenoid (SS), ECM |
| 62 | Shift solenoid (SS) A – signal malfunction | Wiring, shift solenoid (SS), ECM |
| 63 | Shift solenoid (SS) B – circuit malfunction | Wiring, shift solenoid (SS), ECM |
| 64 | Shift solenoid (SS) B – signal malfunction | Wiring, shift solenoid (SS), ECM |
| 72 | Transmission range (TR) switch – range/performance problem | Wiring, TR switch, ECM |
| Engine control module (ECM)/immobilizer control module – ECM | Programming error, immobilizer control module, | |
| 81 | ||
| identification mismatch | ECM | |
| 82 | Engine control module (ECM) – internal failure | ECM |
| Wiring, open circuit/short circuit, immobilizer | ||
| 83 | Immobilizer control module – circuit malfunction | |
| control module, ECM | ||
| 84 | Engine control module (ECM) – programming error | Carry out ECM programming |