Circuit Description
The electronic suspension control (ESC) module provides power (a regulated 5 volts) to each of the position sensors. The ESC module also monitors this voltage supply for a fault condition which prevents proper regulation.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
| • | The position sensor supply voltage is outside the valid range of 3.75 to 5.625 volts. |
| • | The fault is detected for 1 second or more during three consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with a scan tool. |
Action Taken When the DTC Sets
| • | The ESC module will enter the Speed Dependent damping mode. |
| • | Both Left and Right Normal Force outputs will be set to the default output states. |
| • | The SERVICE SUSPENSION SYS and SPEED LIMITED TO XXX messages will be displayed. |
Conditions for Clearing the MIL/DTC
| • | The scan tool can be used to clear the DTC. |
| • | The DTC is saved as history when the ESC module no longer sees a position sensor supply voltage outside the valid range of 3.75 to 5.625 volts. The DTC will clear if the fault does not return after 50 consecutive ignition cycles. |
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.
-
Determines if the fault is due to a short to ground.
-
Determines if the fault is due to a short to voltage.
-
Tests for a short to ground in the position sensor supply circuits.
-
Tests for a short between the position sensor supply and ground circuits.
-
Tests for a short to voltage in the position sensor supply circuits.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Suspension Controls Schematics | ||||
1 | Did you perform the Electronic Suspension Control Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Electronic Suspension Control |
Does the voltage measure less than the specified value? | 3.75 V | Go to Step 4 | Go to Step 3 | |
Does the voltage measure greater than the specified value? | 5.625 V | Go to Step 6 | Go to Step 7 | |
Test the 5-volt reference circuit of each position sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 5 | |
Test for a short between the 5-volt reference circuit and the ground circuit of each position sensor. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 7 | |
Test the 5-volt reference circuit of each 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 8 | Go to Step 7 | |
7 |
Important: Perform the set up and calibration procedure for the ESC module. Replace the ESC module. Refer to Electronic Suspension Control Module Replacement . Did you complete the replacement? | -- | Go to Step 8 | -- |
8 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
