P1630

Code

SCION P — Powertrain

Traction control communication malfunction

Brand: SCION

Type: P — Powertrain

Views: UK: 2 EN: 6 RU: 4

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Page language: EN

CAN bus or network wiring fault (open, short to battery/ground, high resistance)
Poor or intermittent power/ground to ECM, ABS/VSC or related modules
Blown fuse supplying traction control/ABS or ECM systems
Faulty ABS, VSC or engine control module
Corroded or loose connectors at modules or harness junctions
Aftermarket electronic equipment causing bus interference

Read all stored and pending DTCs from all modules (ECM, ABS/VSC, BCM) and note freeze frame
Check vehicle battery voltage and condition; verify good engine compartment and chassis grounds
Inspect fuses related to ABS, VSC, and ECM power/ignition circuits
Visually inspect connectors and wiring at ABS/VSC module, ECM and junctions for corrosion, damage, or loose pins
Check for aftermarket devices (alarm, radio, remote start) tied into CAN or power/ground
Scan network for module presence and communication data using a capable scan tool

Typical CAN bus: two-wire differential (CAN H/CAN L) — expect ~2.5V idle midpoint, ~3.5V (H) and ~1.5V (L) on recessive/dominant transitions
Termination resistance ~60 ohms between CAN H and CAN L (two 120 Ω resistors in parallel)
Module supply voltage: battery voltage present at module power pins (approx. 11–14.5 V with engine running)
No unexpected short to battery or ground on communication lines
Consistent module presence/ID on network when scanned

Connect a professional scan tool and record all DTCs from ECM, ABS/VSC and other network modules. Note freeze-frame and occurrence history.
Check battery voltage and charge if necessary. Verify main grounds and power feeds to ECM and ABS/VSC modules.
Inspect fuses for ABS, VSC and ECM; replace if blown and test for reoccurrence.
Visually inspect connectors and wiring at ABS/VSC and ECM for damage, corrosion or loose pins. Repair any faults found.
Using the scan tool, confirm whether ABS/VSC and ECM modules are present and communicating. If a module is missing, focus on power, ground, and CAN wiring to that module.
Perform a wiggle test on harnesses while monitoring network status; look for intermittent faults.
Measure CAN H/L with a multimeter/oscilloscope. Verify idle voltages, signal transitions while commanding modules, and termination resistance between H and L.
If wiring and power/grounds are good but communication is lost to a specific module, swap or bench-test the suspect module per manufacturer procedure, or verify programming/software level before replacement.
Clear codes and test drive to confirm repair. If code returns, escalate to manufacturer service information for module-specific troubleshooting and software updates.

⚠️ Status

Communication fault between engine control and traction control/ABS systems. Traction control functions disabled until communication is restored.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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P1630 — Traction control communication malfunction