Optima & Magentis (Canadian)

Warm up engine to normal operating temperature and let idle. Using DVOM to backprobe, measure voltage between following MAF sensor harness connector terminals and ground:

• On 2.4L, terminal No. 5 (Brown wire). See Figure. At idle, voltage should be 1.2-1.6 volts. When engine is accelerated voltage should increase, at 3000 RPM voltage should be between 1.6-2.2 volts. If voltage is not as specified, replace MAF sensor.
• On 2.7L, terminal No. 2 (Yellow wire). See Figure. At idle, voltage should be 0.6-1.0 volts. When engine is accelerated voltage should increase, at 2000 RPM voltage should be between 1.0-1.6 volts. If voltage is not as specified, replace MAF sensor.