For 1990-2009 cars

## Residual Air Pressure Check Do Not Use

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
DEFINITION: The objective of this check is to identify and repair potential sources of problems with the air replenishment cycle.
1 |

1. Unload the vehicle completely
2. Turn the ignition switch to RUN and wait approximately 40 seconds.

Does the compressor run for more than 7 seconds?

--

Go to Step 2

Go to Step 3

2 | Perform the electrical check in chart 6 in Electrical Diagnosis. Is the repair complete? | -- | System OK | Go to Step 8
3 | Does the compressor run for less than 1½ second or not at all? | -- | Go to Step 4 | Go to Step 5
4 | Perform the electrical check in chart 4 in Electrical Diagnosis. Is the repair complete? | -- | System OK | Go to Step 8
5 | Do the shock air sleeves slightly inflate after a cycle? Do the air sleeves stay slightly inflated? | -- | System OK | Go to Step 6
6 | Perform the Air Path Check. Refer to Air Compressor Leak Test . Is the repair complete? | -- | System OK | Go to Step 7
7 | Replace the dryer Is the repair complete? | -- | System OK | Go to Step 8
8 |

1. Check for poor connections or damage at the automatic level control sensor.
2. Check the automatic level control sensor adjustment. Refer to Air Compressor Leak Test .

Is the repair complete?

--

System OK

Go to Step 9

9 |

1. Replace the automatic level control sensor.
2. Perform the system operation check in order to verify the repair.

Is the repair complete?

--

System OK

--

## Residual Air Pressure Check Do Not Use

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
DEFINITION: The objective of this check is to identify and repair potential sources of problems with the air replenishment cycle.
1 |

1. Unload the vehicle completely.
2. Turn the ignition switch to RUN and wait approximately 40 seconds.

Does the compressor run for more than 7 seconds?

--

Go to Step 2

Go to Step 3

2 | Perform the electrical check in chart 6 in Electrical Diagnosis. Is the repair complete? | -- | System OK | Go to Step 8
3 | Does the compressor run for less than 1½ second or not at all? | -- | Go to Step 4 | Go to Step 5
4 | Perform the electrical check in chart 4 in Electrical Diagnosis. Is the repair complete? | -- | System OK | Go to Step 8
5 | Do the shock air sleeves slightly inflate after a cycle? Do the air sleeves stay slightly inflated? | -- | System OK | Go to Step 6
6 | Perform the Air Path Check. Refer to Air Compressor Leak Test . Is the repair complete? | -- | System OK | Go to Step 7
7 | Replace the dryer Is the repair complete? | -- | System OK | Go to Step 8
8 |

1. Check for poor connections or damage at the automatic level control sensor.
2. Check the automatic level control sensor adjustment. Refer to Air Compressor Leak Test .

Is the repair complete?

--

System OK

Go to Step 9

9 |

1. Replace the automatic level control sensor.
2. Perform the system operation check in order to verify the repair.

Is the repair complete?

--

System OK

--