Code I039 (4.6L) Loss Of RSS Data
- If this code is set with any other codes, see MULTIPLE DATA COMMUNICATION CODES (4.6L). If this code is set by itself, IPC is not able to exchange data with Road Sensing Suspension (RSS) module. Message SERVICE RIDE CONTROL will be displayed in DIC. Problem will be one of following:
- Opens in Tan wire between EBTCM and RSS module and between RSS module and ACP.
- Open or short in power or ground circuits of RSS module.
- Faulty RSS module.
- Turn ignition on. Enter diagnostics. See ENTERING SELF-DIAGNOSTICS under SELF-DIAGNOSTICS. If Code I039 is current (C), go to next step. If Code I039 is stored as history (H), fault is not present.
- Using a DVOM connected to ground, backprobe for voltage at RSS module connector C2 terminals D1 (Orange wire) and D5 (Brown wire) for DeVille. See Fig 1 -12. If system voltage is present at both terminals, go to step 7). If low voltage is present at terminal D5, go to step 5). If low voltage is present at terminal D1, go to next step.
- Check fuse C5 in engine compartment fuse block. If fuse is blown, repair short to ground in Orange wire between RSS module and fuse. If fuse is okay, repair open in Orange wire.
- Check engine compartment fuse A3. If fuse is okay, repair open in Brown wire between RSS module and fuse. If fuse is blown, turn ignition off. Disconnect RSS module connector C2. Using a DVOM, check for continuity to ground at RSS module connector C2 fused circuits. See Fig 1 -12.
- If continuity is present on either circuit, repair short to ground in Brown or White wire. If no continuity is present on either circuit, check for intermittent short to ground in both wires.
- Disconnect RSS module connector C1. Turn ignition on. Using DVOM, measure voltage to ground at RSS module connector C1 terminals D9 and D8. If voltage fluctuates between 3 and 5 volts, go to next step. If voltage is less than 3 volts, repair open in Tan wire between ACP and RSS module and between EBTCM and RSS module.
- Turn ignition off. Using a DVOM, measure resistance between ground and RSS module connector C3 terminal "G" (Black wire). See Fig 1 -12. Repair Black wire if resistance is greater than one ohm. If resistance is less than one ohm, check for improper terminal contact and connector damage. If contact and connector are okay, replace RSS module. After all repairs are completed, clear all codes and verify correct operation.