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 (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
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