The air suspension pressure sensor sends a voltage signal to the air suspension module that corresponds to a pressure within the range of 30-180 psi. The air suspension module also uses this signal to verify that the proper amount of pressure is achieved in the air dryer within 23 seconds prior to opening of the inlet valves for inflation of the air springs.
This diagnostic procedure supports the following DTC:
DTC C0711 Level Control Air Pressure Sensor Circuit
The ignition is ON.
The air suspension module detects that the rate of height change, central air camber pressure or the signal from the air pressure sensor is out of limits.
• | Air Suspension functionality is suspended. |
• | SERVICE AIR SUSPENSION message is displayed. |
• | The DTC will be active when the vehicle is moving, but then it will go to history when the vehicle is not moving. |
• | DTCs can be cleared with scan tool. |
Repair all other DTCs before C0711.
This DTC is set when:
• | The pneumatic status of the air suspension system is out of limits. |
• | When excessive amounts of time have elapsed when inflating the air springs. |
• | When there is a air leak in the system. |
• | When vehicle speed is greater than 3 km/h (1.8 mph) and rate of height change is out of limits which may be caused by a damaged LR or RR air suspension sensor. |
• | When the 60-amp compressor fuse is open. |
• | When the compressor relay is defective. |
• | When there is an intermittent or permanent loss of continuity between the compressor and the compressor supply voltage during an upwards leveling event. |
The numbers below refer to the step numbers on the diagnostic table.
Test for the proper operation of the compressor and compressor relay.
Tests for open circuits in the compressor battery positive voltage circuit and compressor ground circuit.
Tests for voltage in the 5-volt reference circuit.
Tests for a high resistance or for an open in the low reference circuit.
Check for open or high resistance in the sensor ground circuit.
The replacement suspension module calibration must be checked and calibrated if necessary.
Step | Action | Values | Yes | No | ||||||
---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Air Suspension Schematics | ||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||
Important: Be sure all doors are closed and engine is running for this test.
Does the compressor run and rear of vehicle raise? | -- | Go to Diagnostic Aids | Go to Step 3 | |||||||
Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 4 | |||||||
Is the voltage less than the specified value? | 5 V | Go to Step 5 | Go to Step 6 | |||||||
Is the resistance less than the specified value? | 5 ohms | Go to Step 7 | Go to Step 10 | |||||||
6 | Test the 5-volt reference circuit of the air pressure sensor for a short to voltage. Refer to Circuit Testing and Testing for a Short to Voltage . Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 12 | ||||||
7 | Test the 5-volt reference circuit of the air pressure sensor for one of the following conditions:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 12 | ||||||
8 | Test the signal circuit of the air pressure sensor for one of the following conditions:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 9 | ||||||
9 | Test the signal circuit of the air pressure sensor for a short to voltage. Refer to Testing for a Short to Voltage and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 12 | ||||||
Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 12 | |||||||
11 | Inspect for poor connections at the harness connector of the air pressure sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 13 | ||||||
12 | Inspect for poor connections at the harness connector of the air suspension module. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 14 | ||||||
13 | Replace the air suspension pressure sensor. Refer to Valve Automatic Level Control Solenoid Replacement . Did you complete the replacement? | -- | Go to Step 15 | -- | ||||||
Did you complete the replacement? | -- | Go to Step 15 | -- | |||||||
15 |
Does the DTC reset? | -- | Go to Step 2 | System OK |