Circuit Description
The automatic level control sensor is a potentiometer. The rear integration module (RIM) determines the height of the rear of the vehicle based on the voltage from the automatic level control sensor. The RIM raises or lowers the rear of the vehicle in order to keep the vehicle level.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0628 Left Rear Position Sensor Circuit High
Conditions for Running the DTC
The RIM detects a short to battery voltage on the reference or signal circuit.
Conditions for Setting the DTC
The leveling sensor input or feed circuit is found to be shorted to battery voltage for more than 10 seconds.
Action Taken When the DTC Sets
The automatic leveling control will be disabled.
Conditions for Clearing the DTC
When the RIM does not detect voltage out of the specified range in the signal or reference circuit during the diagnostic self test
Diagnostic Aids
Refer to Testing for Intermittent Conditions and Poor Connections and Testing for Electrical Intermittents in Wiring Systems.
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Automatic Level Control Schematics | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the scan tool indicate the voltage is within the specified range? | 0.25-4.75 V | Go to Diagnostic Aids | Go to Step 3 |
3 |
Does the scan tool indicate that the voltage parameter is greater than the specified value? | 0 V | Go to Step 4 | Go to Step 10 |
4 | Measure the voltage of the suspension position sensor signal circuit to ground. Does the scan tool indicate that the voltage parameter is greater than the specified value? | 5 V | Go to Step 6 | Go to Step 5 |
5 | Measure the voltage of the suspension position sensor reference circuit to ground. Does the scan tool indicate that the parameter is greater than the specified value? | 5 V | Go to Step 7 | Go to Step 8 |
6 | Test the 5-volt signal circuit of the suspension position 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 14 | Go to Step 11 |
7 | Test the 5-volt reference circuit of the suspension position 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 14 | Go to Step 11 |
Measure the resistance of the suspension position sensor ground circuit to ground. Is the resistance greater than the specified value? | 5 ohms | Go to Step 9 | Go to Step 10 | |
9 | Repair the open circuit or short to voltage on the suspension position sensor ground circuit. Did you find and correct the condition? | -- | Go to Step 14 | -- |
10 | Inspect for poor connections at the harness connector of the suspension position 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 14 | Go to Step 12 |
11 | Inspect for poor connections at the harness connector of the RIM. 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 14 | Go to Step 13 |
12 |
Important: Perform the automatic level control (ALC) relearn procedure. Replace the suspension position sensor. Refer to Automatic Level Control Sensor Replacement . Did you complete the replacement? | -- | Go to Step 14 | -- |
13 | Replace the RIM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 14 | -- |
14 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
