DESCRIPTION
The power steering ECU distinguishes the ignition switch status as ON or off through the IG power source circuit.
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
C1551 |
IG power source circuit malfunction inside ECU |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
READ VALUE USING TECHSTREAM (IG POWER SUPPLY) |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / EMPS / Data List.
(f) Select the items "IG Power Supply" in the Data List and read the value displayed on the Techstream.
EMPS
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
IG Power Supply |
ECU power source voltage/ Min.: 0 V Max.: 20.1531 V |
11 to 14 V |
Ignition switch ON |
OK:
Normal condition value is displayed the Techstream.
OK | ![]() |
REPLACE POWER STEERING ECU |
|
2. |
CHECK HARNESS AND CONNECTOR (BATTERY - POWER STEERING ECU) |
(a) Disconnect the connectors from the power steering ECU. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
D20-6 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D19-2 (PGND) - Body ground |
Always |
Below 1 Ω |
*1 |
Front view of wire harness connector (to Power Steering ECU) |
OK | ![]() |
REPLACE POWER STEERING ECU |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedures to troubleshoot the power back door system.
*: Use the Techstream.
PROCEDURE
1.
VEHICLE BROUGHT TO WORKSHOP
NEXT
...
Removal
REMOVAL
PROCEDURE
1. PRECAUTION
CAUTION:
Be sure to read Precaution thoroughly before servicing (See page
).
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DTC SUMMARY
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Monitoring Item
Malfunction Detection Condition
Trouble Area
Detection Timing
Detection Logic
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