Circuit Description
The automatic level control sensor (ALC) is a potentiometer. The rear integration module (RIM) determines the height of the rear of the vehicle based on the voltage from the ALC 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 C0625 Left Rear Position Sensor Circuit
Conditions for Running the DTC
The RIM is powered up and DTC B1327 is not set.
Conditions for Setting the DTC
| • | The ALC signal voltage is less than 0.35 volts or greater than 4.75 volts. |
| • | The above conditions are present for greater than 10 seconds. |
Action Taken When the DTC Sets
The ALC suspension will be inoperative.
Conditions for Clearing the MIL/DTC
The RIM does not detect a voltage above or below the predetermined value during the diagnostic self test.
Diagnostic Aids
Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests for the proper operation of the circuit in the high range. If the fuse in the jumper opens when you perform the test, the signal circuit is shorted to ground.
-
This step tests for a short to voltage in the 5-volt reference circuit.
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? | 0.35-4.75 V | Go to Diagnostic Aids | Go to Step 3 |
3 |
Does the voltage measure near the specified value? | 5 V | Go to Step 4 | Go to Step 7 |
Does the scan tool indicate that the suspension position sensor voltage is greater than the specified value? | 4.75 V | Go to Step 5 | Go to Step 8 | |
Does the voltage measure less than the specified value? | 4.75 V | Go to Step 6 | Go to Step 9 | |
6 |
Does the resistance measure less than the specified value? | 5 ohms | Go to Step 11 | Go to Step 10 |
7 | Test the 5-volt reference circuit of the suspension position sensor for a short to ground, high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 12 |
8 | Test the 5-volt signal circuit of the suspension position sensor for a short to ground, high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 12 |
9 | Test the 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 15 | Go to Step 12 |
10 |
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 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 15 | Go to Step 13 |
12 | 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 15 | Go to Step 14 |
13 | Replace the suspension position sensor. Refer to Automatic Level Control Sensor Replacement . Did you complete the replacement? | -- | Go to Step 15 | -- |
14 | 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 15 | -- |
15 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
