C0870
DTC C0870
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC C0870 03
- Control Module Voltage Reference Output Circuit Low Voltage
DTC C0870 07
- Control Module Voltage Reference Output Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The suspension control module supplies a 5 V reference voltage and a low reference to each body acceleration sensor and vertical suspension acceleration sensor. The body acceleration sensors and vertical suspension acceleration sensors supply a signal of 0.5-4.5 V to the suspension control module.
Conditions for Running the DTC
System voltage is between 9-16 V.
Conditions for Setting the DTC
C0870 03
The suspension control module detected a short to ground on the 5 V reference circuit for 1.5 s.
C0870 07
The suspension control module detected a short to voltage on the 5 V reference circuit for 1.5 s.
Action Taken When the DTC Sets
* The electronic suspension control is disabled for the duration of the ignition cycle.
* The driver information center displays the SERVICE SUSPENSION SYSTEM message.
Conditions for Clearing the DTC
* A present DTC will clear on the next consecutive malfunction-free ignition cycle.
* A history DTC will clear after 41 consecutive malfunction-free ignition cycles.
Reference Information
Schematic Reference
Electronic Suspension Control Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Electronic Suspension Control Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing For Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Suspension Position Sensor 5 V Reference parameter. The parameter should be 4.8-5.2 V.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connectors at all 5 vertical body and suspension acceleration sensors.
2. Ignition ON, test for 4.8-5.2 V between any one of the 5 V reference circuits terminal and ground.
• If less than the specified range, test all of the 5 V reference circuits for a short to ground. If the circuits test normal, replace the K19 suspension control module.
• If greater than the specified range, test all of the 5 V reference circuits for a short to voltage. If the circuits test normal, replace the K19 suspension control module.
3. Test for 4.8-5.2 V between all 5 vertical body and suspension acceleration sensor signal circuits terminals and ground.
• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K19 suspension control module.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K19 suspension control module.
4. Reconnect each acceleration sensor, one at a time, cycling the ignition OFF and then ON between each connection while observing the scan tool Suspension Position Sensor 5 V Reference parameter. Verify the parameter is between 4.8-5.2 V.
• If not within the specified range when a particular acceleration sensor is connected, replace that sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Electronic Suspension Front Vertical Accelerometer Replacement - Upper (Electronic Suspension Front Vertical Accelerometer Replacement - Upper)
* Electronic Suspension Front Vertical Accelerometer Replacement - Lower (Electronic Suspension Front Vertical Accelerometer Replacement - Lower)
* Electronic Suspension Rear Position Sensor Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for suspension control module replacement, setup and programming