DTC C1291/48 VGRS ECU Communication Error: Wiring Diagram

Fig 1: VGRS ECU Communication Error Wiring Diagram

CHECK SKID CONTROL ECU COMMUNICATION
1. Remove the skid control ECU.
2. Connect an oscilloscope to terminals AFS+ and AFS- or VSC+ and VSC- of skid control ECU.
3. Start the engine, and check the signal waveform.
OK : A waveform is output, as shown in the illustration.

NG : REPLACE SKID CONTROL ECU ASSEMBLY

Fig 2: Checking Signal Waveform
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : Go To Next Step
CHECK WIRE HARNESS (SKID CONTROL ECU ASSEMBLY - VGRS ECU)
NG : REPAIR OR REPLACE HARNESS AND CONNECTOR

OK : REPLACE VGRS ECU