Circuit Description
The suspension control module supplies 5 volts to the real time damping (RTD) air pressure sensor. The pressure sensor uses this reference voltage to produce an analog output of approximately 0.15-4.85 volts. The signal voltage is a reference of the air pressure in the rear leveling system.
Conditions for Running the DTC
The ignition is ON for 1 second.
Conditions for Setting the DTC
The suspension control module detects a signal voltage of below 0.15 volts or above 4.85 volts.
Action Taken When the DTC Sets
| • | The system assumes a default pressure. |
| • | Disables intake sequences. |
| • | Stores a DTC C0711 in the suspension control module memory. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and the DTC is cleared with a scan tool. |
| • | A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
Diagnostic Aids
| • | If DTC C0870 is present, perform the diagnosis for that DTC first. |
| • | A leak in the air tube at the RTD air pressure sensor may cause a faulty sensor voltage reading. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests for the proper voltage output on the 5-volt reference circuit and the proper operation of the signal circuit.
-
This step tests for possible low 5-volt reference output or a problem with the signal circuit.
Step | Action | Values | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Suspension Controls Schematics Connector End View Reference: Suspension Controls Connector End Views | ||||||||||
1 |
Important: If DTC C0870 is present, perform the diagnosis for DTC C0870 first. Did you perform the Real Time Damping (RTD) Diagnostic System Check? | -- | Go to Step 2 | |||||||
Does the scan tool indicate that the RTD Air Pressure Sensor parameter is between the specified voltage range? | 4.5 - 5.5 V | Go to Step 8 | Go to Step 3 | |||||||
With the 3-amp fused jumper wire still connected, does the scan tool indicate that Air Pressure Sensor parameter is below the specified voltage value? | 4.5 V | Go to Step 5 | Go to Step 4 | |||||||
4 | Test the 5-volt reference circuit of the air pressure sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 7 | ||||||
5 | Test the 5-volt reference circuit of the air pressure sensor for the following conditions:
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 6 | ||||||
6 | Test the signal circuit of the air pressure sensor for the following conditions:
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 11 | ||||||
7 | Test the signal circuit of the air pressure sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 11 | ||||||
8 | Test the low reference circuit of the air pressure sensor for the following conditions:
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 9 | ||||||
9 | Inspect for poor connections at the harness connector of the air pressure sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 10 | ||||||
10 | Replace the pressure sensor. Refer to Automatic Level Control Air Dryer and Pressure Sensor Replacement . Did you complete the replacement? | -- | Go to Step 12 | -- | ||||||
11 |
Important: After replacement, use the scan tool to perform the set up procedure (re-calibrate) located under Special Functions (F8: Recalibration) for the suspension control module. Replace the suspension control module. Refer to Electronic Suspension Control Module Replacement . Did you complete the replacement? | -- | Go to Step 12 | -- | ||||||
12 |
Does the DTC reset? | -- | Go to Step 2 | System OK | ||||||
