Detroit Fault Codes SPN 84/FMI 19 – EPA07 – GHG14
SPN 84/FMI 19 - EPA07 - GHG14
J1939 Wheel-based Vehicle Speed Signal (VSS) from Source #1, #2, or #3 is Erratic
SPN 84/FMI 19
| Description | J1939 Wheel-Based Vehicle Speed Signal from Source#1, #2, or #3 is erratic |
|---|---|
| Monitored Parameter | Vehicle Speed Sensor |
| Typical Enabling Conditions | rpm greater than1500, Torque Demand On |
| Monitor Sequence | None |
| Execution Frequency | Continuous when enabling conditions met |
| Typical Duration | 10 Seconds |
| Dash Lamps | MIL |
| Verification | rpm greater than 1500, Torque Demand On |
Description:
1. Check for multiple codes:
1.1. If Common Powertrain Controller (CPC) SPN 168/FMI 0/14/18 (battery voltage) are present, troubleshoot and repair these first.
1.2. If Motor Control Module (MCM) SPN 625/FMI 9 is present, troubleshoot and repair the Controller Area Network (CAN) line.
1.3. If only a J1939 Error fault is present, Go to step 2.
2. Has the CPC been recently reprogrammed?
2.1. Yes; check the proper configuration of the CPC.
2.2. No; connect ServiceLink to determine which modules are configured for the vehicle and their communication status. Once this is done, follow the appropriate module communication troubleshooting procedures for the affected module.
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