Component Testing
IMPORTANT:
You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding with the Component Testing.
Skewed Sensor 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 J-23738-A or the J-35555 to apply 5 in Hg of vacuum to the MAP sensor, the parameter in the first column should decrease by 17 kPa. See Special Tools . The acceptable range is indicated in the second column.
- Using the J-23738-A or the J-35555 to apply 10 in Hg of vacuum to the MAP sensor, the parameter in the first column should decrease by 34 kPa. See Special Tools . 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 MAP sensor.
- Install a 3A fused jumper wire between the 5-volt reference circuit terminal C and the corresponding terminal of the MAP sensor.
- Install a jumper wire between the low reference terminal A of the MAP sensor and ground.
- Install a jumper wire at terminal B of the MAP sensor.
- Connect a DMM between the jumper wire from the terminal B of the MAP sensor and ground.
- Ignition ON, with the J-23738-A
or J-35555
, slowly apply vacuum to the sensor while observing the voltage on the DMM. See Special Tools
. The voltage should vary between 4.9-0.2 volts without any spikes or dropouts.
- If the voltage is erratic, replace the MAP sensor.