Lexus ES: Power Steering ECU Communication Stop Mode
DESCRIPTION
Detection Item | Symptom | Trouble Area |
Power Steering ECU Communication Stop Mode | Any of the following conditions are met: | -
Rack and pinion power steering gear assembly branch line or connector
-
Power source circuit of rack and pinion power steering gear assembly
-
Rack and pinion power steering gear assembly ground circuit
-
Rack and pinion power steering gear assembly
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
-
Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
-
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
1. | CHECK FOR OPEN IN CAN BUS LINES (RACK AND PINION POWER STEERING GEAR ASSEMBLY BRANCH LINE) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the C37 rack and pinion power steering gear assembly connector.
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection | Condition | Specified Condition | C37-10 (CANH) - C37-11 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 54 to 69 Ω | | | *a | Front view of wire harness connector (to Rack and Pinion Power Steering Gear Assembly) | | |
NG | | REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (RACK AND PINION POWER STEERING GEAR ASSEMBLY) |
OK | | |
2. | CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection | Condition | Specified Condition | C37-7 (PGND) - Body ground | Cable disconnected from negative (-) auxiliary battery terminal | Below 1 Ω | | | *a | Front view of wire harness connector (to Rack and Pinion Power Steering Gear Assembly) | | |
(b) Reconnect the cable to the negative (-) auxiliary battery terminal.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
C37-4 (IG) - Body ground | Power switch on (IG) | 11 to 14 V |
NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
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SEE MORE:
PARTS LOCATION ILLUSTRATION *1 HEADLIGHT ECU SUB-ASSEMBLY RH *2 BRAKE ACTUATOR ASSEMBLY *3 FORWARD RECOGNITION CAMERA *4 ECM *5 RACK AND PINION POWER STEERING GEAR ASSEMBLY *6 HEADLIGHT ECU SUB-ASSEMBLY LH *7 MILLIMETER WAVE RADAR SENSOR ASSEMBLY *8 BLIND SPOT
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