Pinpoint Test K: DTC C1810
Vehicle Dynamic Suspension
Pinpoint Tests
Pinpoint Test K: DTC C1810
Normal Operation
The 2 rear height sensors receive a 5-volt reference voltage from the Vehicle Dynamics Module (VDM) along circuit LCL12 (VT/OG), both sensors share a common return path along circuit RCL12 (GN/WH). The RR sensor sends the suspension height voltage back to the VDM along circuit VCL12 (WH/VT). The LR sensor sends the suspension height voltage back to the module along circuit VCL13 (BN/BU). The VDM monitors the 2 height sensors and makes adjustments to the rear suspension based on sensor input.
- DTC C1810 (Air Suspension Height Sensor Delta Out Of Range) - When performing a self-test, a ride height adjustment or when the VDM adjusts the ride height through normal operation, if the left and right calculated ride height value differs by 100 mm (3.93 in) or more, DTC C1810 will be set.
This pinpoint test is intended to diagnose the following:
- Vehicle lean (air spring leak, asymmetric loading)
- Height sensor bracket bent or loose
- Height sensor link arm bent, loose or disconnected
- Height sensor(s) out of calibration
- Air tube restriction
PINPOINT TEST K: DTC C1810
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K1 VERIFY THAT DTC C1810 IS PRESENT AND ACTIVE
NOTE: The VDM will log DTC C1810 if the left and right calculated ride height value differs by 100 mm (3.93 in) or more.
- Connect the scan tool.
- Ignition ON.
- Carry out the Pneumatic Test. Inspection and Verification
- Does DTC C1810 set after carrying out the Pneumatic Test?
Yes
GO to K2.
No
GO to K3.
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K2 INSPECT THE RH AND LH HEIGHT SENSORS
- Verify that both height sensor arms are fastened to the ball studs on the height sensor(s) and lower control arm(s).
- Verify that the height sensor arms are installed correctly, and not positioned on backwards.
- Inspect for loose or bent height sensor(s) and height sensor(s) arms.
- Are any of the height sensor components damaged?
Yes
INSTALL new component(s) as necessary, RESET the vehicle ride height. REFER to Ride Height Adjustments Ride Height Adjustments. REPEAT the self-test.
No
GO to K3.
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K3 CHECK THE VEHICLE FOR ASYMMETRICAL LOADING
- Check for unbalanced or heavy load on one side of the vehicle.
- Is the vehicle heavily loaded on one side causing the ride height to be incorrect?
Yes
REPAIR the loading issue and REPEAT the self-test.
No
GO to K4.
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K4 CHECK FOR VEHICLE LEANING
- Ignition OFF.
- Position the vehicle on a level surface.
- Using the scan tool, carry out the Accurate Trim Test. Inspection and Verification
- Are both the LR and RR ride heights within specification?
Yes
GO to K7.
No
GO to K5.
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K5 CHECK THE HEIGHT SENSOR OPERATION DURING PUMP
- Using the scan tool, inflate the system to for 30 seconds and monitor the following PIDs:
- Left Rear Height Sensor Voltage (LR_HEIGHT)
- Right Rear Height Sensor Voltage (RR_HEIGHT)
- Does the system inflate evenly?
Yes
GO to K6.
No
GO to Pinpoint Test C. Pinpoint Test C: Vehicle Raises and/or Lowers Too Slowly Or Uneven Vehicle Height
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K6 CHECK HEIGHT SENSOR OPERATION DURING VENT
- Using the scan tool, command the system to vent for 20 seconds and monitor the following PIDs:
- Left Rear Height Sensor Voltage (LR_HEIGHT)
- Right Rear Height Sensor Voltage (RR_HEIGHT)
- Does the system deflate evenly?
Yes
GO to K7.
No
GO to Pinpoint Test C. Pinpoint Test C: Vehicle Raises and/or Lowers Too Slowly Or Uneven Vehicle Height
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K7 CHECK THE AIR SPRING(S) FOR LEAKS.
- Inspect both the LR and RR air spring for leaks.
- Are any leaks present?
Yes
REPAIR the leaks, REPEAT the self-test.
No
System operating correctly at this time.
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