Pinpoint Test C : P1758:19
- Refer to Vehicle Dynamic Suspension
for schematic and connector information.
Normal Operation and Fault Conditions
Using input from the height sensors and HS-CAN2 messages, the VDM provides a varying current to the damper solenoid valves. The VDM is programmed with an upper limit for this current. One or more of the height sensors failing internally and damage or modifications to the vehicle suspension may cause this DTC to set.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition VDM P1758:19 Pressure Solenoid Control System Incorrect Current: Circuit Current Above Threshold This DTC sets in continuous memory if one or more of the damper solenoids requests a current greater than or equal to 1.7 amps continually for more than 3 minutes, 3 or more times during the same ignition cycle. Possible Sources
- Height sensor(s) incorrectly installed
- Height sensor(s) faulted
- VDM calibration
- C1 RECHECK THE VDM (VEHICLE DYNAMICS CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, carry out the VDM self-test.
Is P1758:19 the only DTC present in the VDM?
Yes GO to C2 No DIAGNOSE and REPAIR all other VDM Diagnostic Trouble Codes (DTCs) before diagnosing P1758:19. GO to the DTC Chart: Vehicle Dynamics Control Module (VDM). - C2 INSPECT THE SUSPENSION HEIGHT SENSORS
- With the transmission in NEUTRAL, position the vehicle on a hoist. REFER to: Jacking and Lifting - Overview .
- Inspect height sensors, make sure they are undamaged and correctly installed. REFER to: Vehicle Dynamic Suspension .
Are height sensors undamaged and installed correctly?
Yes GO to C3 No INSTALL new height sensor(s) as necessary. REFER to: Front Suspension Height Sensor . TEST DRIVE the vehicle above 8 km/h (5 mph) on a smooth surface for at least 3 minutes. CARRY OUT the VDM self-test. If the DTC returns, GO to C3 - C3 RECALIBRATE THE VDM (VEHICLE DYNAMICS CONTROL MODULE) AND CHECK THE DAMPER SOLENOID CURRENT DRAWS
- Using a diagnostic scan tool, carry out the Ride Height Calibration routine without passengers or cargo in the vehicle.
- Test drive the vehicle above 8 km/h (5 mph) on a smooth surface for at least 4 minutes and use a diagnostic scan tool to record the following Parameter Identifications (PIDs):
- Left Front Damper Current (LF_DAMP_CUR)
- Right Front Damper Current (RF_DAMP_CUR)
- Left Rear Damper Current (LR_DAMP_CUR)
- Right Rear Damper Current (RR_DAMP_CUR)
Does any solenoid damper request a current greater than or equal to 1.7 amps continually for longer than 3 minutes?
Yes GO to C4 No The system is operating correctly at this time. The concern may have been caused by an incomplete or incorrectly calibrated VDM. - C4 CHECK THE VDM (VEHICLE DYNAMICS CONTROL MODULE) HEIGHT SENSOR VOLTAGE PARAMETER IDENTIFICATIONS (PIDS)
- Using a diagnostic scan tool, read the following Parameter Identifications (PIDs):
- Left Front Height Sensor Voltage (LF_Hght_Sens)
- Right Front Height Sensor Voltage (RF_Hght_Sens)
Do the front sensor Parameter Identifications (PIDs) display 1.7 volts or less?
Yes The system it operating correctly at this time. The DTC may have been set due to an intermittent fault condition. No INSTALL a new height sensor(s). REFER to: Front Suspension Height Sensor . - Using a diagnostic scan tool, read the following Parameter Identifications (PIDs):