DESCRIPTION
Detection Item | Symptom | Trouble Area |
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Power Steering ECU Communication Stop Mode |
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
Turn the power switch off before measuring the resistances between CAN main bus lines and between CAN branch lines.
Turn the power switch off before inspecting CAN bus lines for a ground short.
After the power switch is turned off, check that the key reminder warning system and light 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 power 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 power 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 CAN BUS LINE FOR DISCONNECTION (POWER STEERING ECU ASSEMBLY BRANCH LINE)
Turn the power switch off.
*a | Front 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 | ||||||
---|---|---|---|---|---|---|
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NG |
REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (POWER STEERING ECU ASSEMBLY) |
OK |
CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)
Disconnect the power steering ECU assembly connector.
*a | Front view of wire harness connector (to Power Steering ECU Assembly) |
Measure the voltage according to the value(s) in the table below.
Standard Voltage | |||||||||
---|---|---|---|---|---|---|---|---|---|
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NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
OK |
CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)
*a | Front view of wire harness connector (to Power Steering ECU Assembly) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
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|
OK |
REPLACE POWER STEERING ECU ASSEMBLY Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT) |