Component Test
NOTE:
You must perform the Circuit/System Testing to verify the integrity of the sensor circuits before proceeding with the Component Testing.
Skewed Signal Test
- Using the following steps and referencing the table below will determine if the MAP sensor is skewed.
- Ignition ON, engine OFF, observe the MAP sensor scan tool parameter.
- Use the observed MAP Sensor Scan Tool parameter that is closest to a value that is indicated in the first column.
THEN
- Using the J23738-A: Mityvac or the J 35555: Metal Mityvac to apply 5 in Hg of vacuum to the MAP sensor, the parameter in the first column should decrease by 17 kPa. The acceptable range is indicated in the second column.
- Using the J23738-A: Mityvac or the J 35555: Metal Mityvac to apply 10 in Hg of vacuum to the MAP sensor, the parameter in the first column should decrease by 34 kPa. The acceptable range is indicated in the third column.
| Ignition ON, Engine OFF, MAP Sensor Parameter | MAP Sensor Parameter With 5 Inches of Vacuum Applied | MAP Sensor Parameter With 10 Inches of Vacuum Applied |
|---|---|---|
| 100 kPa | 79-87 kPa | 62-70 kPa |
| 95 kPa | 74-82 kPa | 57-65 kPa |
| 90 kPa | 69-77 kPa | 52-60 kPa |
| 80 kPa | 59-67 kPa | 42-50 kPa |
| 70 kPa | 49-57 kPa | 32-40 kPa |
| 60 kPa | 39-47 kPa | 22-30 kPa |
Erratic Signal Test
- Ignition OFF, remove the sensor.
- Install a 3A fused jumper wire between the 5-volt reference circuit terminal C and the corresponding terminal of the sensor.
- Install a jumper wire between the low reference circuit terminal A of the sensor and ground.
- Install a jumper wire at the terminal B of the sensor.
- Connect a DMM between the jumper wire from terminal B of the sensor and ground.
- Ignition ON, with the J23738-A:
Mityvac or the J 35555:
Metal Mityvac slowly apply vacuum to the sensor while monitoring the voltage on the DMM. The voltage should vary between 0-5.2 volts, without any spikes or dropouts.
- If the voltage is not within the specified range or is erratic, replace the affected sensor.