DESCRIPTION
Detection Item | Symptom | Trouble Area |
---|---|---|
Power Steering ECU Communication Stop Mode | Either condition is met:
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
Turn the ignition switch off before inspecting CAN bus wires for a ground short.
After the ignition switch is turned off, check that the key reminder warning system are not operating.
Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.
Tech Tips
Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.
PROCEDURE
CHECK FOR OPEN IN CAN BUS WIRE (POWER STEERING ECU ASSEMBLY BRANCH WIRE)
*a | Rear view of wire harness connector (to Power Steering ECU Assembly) |
Disconnect the power steering ECU assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (POWER STEERING ECU ASSEMBLY BRANCH WIRE) |
OK |
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
*a | Rear view of wire harness connector (to Power Steering ECU Assembly) |
Disconnect the power steering ECU assembly connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Result | Proceed to |
---|---|
OK (for LHD) | A |
OK (for RHD) | B |
NG (w/o Stop and Start System) | C |
NG (except IG circuit) (w/ Stop and Start System) | |
NG (for IG circuit) (w/ Stop and Start System) | D |
A |
REPLACE POWER STEERING ECU ASSEMBLY Click here |
B |
REPLACE POWER STEERING ECU ASSEMBLY Click here |
C |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
D |
GO TO STOP AND START SYSTEM (FOR BACKUP BOOST CONVERTER CIRCUIT) Click here |