Resistance Check
- Disconnect ECM couplers (1) from ECM with ignition switch OFF.CAUTION: Never touch terminals of ECM itself or connect voltmeter or ohmmeter (2).
- Check resistance between each pair of terminals of disconnected couplers as listed in the following table.CAUTION:
- Be sure to connect ohmmeter probe from wire harness side of coupler.
- Be sure to turn OFF ignition switch for this check.
- Resistance in the following table represents that when parts temperature is 20°C (68°F).
WAVEFORM REFERENCE
| Terminals | Circuit | Standard resistance | Condition |
|---|---|---|---|
| C45-3 to C46-10 | Heater of HO2S-2 | 4 - 15Ω | - |
| G04-3 to C46-10 | Radiator fan motor relay | 160 - 240 Ω | - |
| C45-23 to G04-25 | Main relay | 160 - 240 Ω | - |
| C45-17 to C46-10 | Fuel pump relay | 160 - 240 Ω | - |
| C45-1 to C46-10 | A/C condenser fan motor relay | 160 - 240 Ω | Battery disconnected and ignition switch ON |
| C46-3 to G04-7 | No. 3 fuel injector | 10.8 - 18.2 Ω | - |
| C46-4 to G04-7 | No. 4 fuel injector | ||
| C46-1 to G04-7 | EGR valve (stepping motor No. 1 coil) | 20 - 29 Ω | - |
| C46-30 to G04-7 | EVAP canister purge valve | 33 - 44 Ω | - |
| C46-2 to G04-7 | No. 2 fuel injector | 10.8 - 18.2 Ω | - |
| C46-18 to G04-7 | EGR valve (stepping motor No. 2 coil) | 20 - 31 Ω | - |
| C46-19 to G04-7 | EGR valve (stepping motor No. 4 coil) | ||
| C46-9 to G04-7 | EGR valve (stepping motor No. 3 coil) | ||
| C46-7 to C46-10 | Heater of HO2S-1 | 2 - 11 Ω | - |
| C46-1 to G04-7 | No. 1 fuel injector | 10.8 - 18.2 Ω | - |
| C46-17 to G04-7 | Idle air control valve (stepping motor No. 1 coil) | 20 - 24 Ω | - |
| C46-25 to G04-7 | Idle air control valve (stepping motor No. 2 coil) | - | |
| C46-24 to G04-7 | Idle air control valve (stepping motor No. 3 coil) | - | |
| C46-31 to G04-7 | Idle air control valve (stepping motor No. 4 coil) | - | |
| G04-5 to G04-7 | EVAP canister vent valve | 25 - 30 Ω | - |