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.
2012 Lexus HS 250hFACTORY OEM SERVICE PROCEDURE
Service Data
| Spark plug | ||
| Spark plug type | DENSO made | SK16R11 |
| NGK made | IFR5A11 | |
| Standard electrode gap | for new spark plug | 1.0 to 1.1 mm (0.0394 to 0.0433 in.) |
| Maximum electrode gap | for used spark plug | 1.3 mm (0.0512 in.) |
| Camshaft timing oil control valve assembly | ||
| Resistance | 1 - 2 | 6.9 to 7.9 Ω at 20°C (68°F) |
| Throttle body | ||
| Resistance | 2 (M+) - 1 (M-) | 0.3 to 100 Ω at 20°C (68°F) |
| Mass air flow meter | ||
| Resistance | 1 (THA) - 2 (E2) | 13.6 to 18.4 kΩ at -20°C (-4°F) |
| 1 (THA) - 2 (E2) | 2.21 to 2.69 kΩ at 20°C (68°F) | |
| 1 (THA) - 2 (E2) | 0.49 to 0.67 kΩ at 60°C (140°F) | |
| Camshaft position sensor | ||
| Resistance | Cold | 835 to 1400 Ω |
| Hot | 1060 to 1645 | |
| Crankshaft position sensor | ||
| Resistance | Cold | 985 to 1600 Ω |
| Hot | 1265 to 1890 Ω | |
| Engine coolant temperature sensor | ||
| Resistance | 20°C (68°F) | 2.32 to 2.59 kΩ |
| 80°C (176°F) | 0.310 to 0.326 kΩ | |
| Knock sensor | ||
| Resistance | at 20°C (68°F) | 120 to 280 kΩ |
| Air fuel ratio sensor | ||
| Resistance | 1 (HT) - 2 (+B) | 1.8 to 3.4 Ω at 20°C (68°F) |
| 1 (HT) - 4 (AF-) | 10 kΩ or higher | |
| Oxygen sensor | ||
| Resistance | 1 (HT) - 2 (+B) | 11 to 16 Ω at 20°C (68°F) |
| 1 (HT) - 4 (E) | 10 kΩ or higher | |
| IG2 RELAY: | ||
| Specified condition | (C-1) - (A-4) | 10 kΩ or higher |
| (C-1) - (A-4) | Below 1 Ω (when battery voltage is applied across terminals A-2 and A-3) | |
| EFI MAIN RELAY: | ||
| Specified condition | (C-1) - (B-4) | 10 kΩ or higher |
| (C-1) - (B-4) | Below 1 Ω (when battery voltage is applied across terminals B-2 and B-3) | |
| C/OPN RELAY | ||
| Specified condition | (B-5) - (B-8) | 10 kΩ or higher |
| (B-5) - (B-8) | Below 1 Ω (when battery voltage is applied across terminals B-6 and B-7) | |
| BATT FAN RELAY | ||
| Specified condition | (C-1) - (A-8) | 10 kΩ or higher |
| (C-1) - (A-8) | Below 1 Ω (when battery voltage is applied across terminals A-6 and A-7) | |
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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