C1551

POWER STEERING: POWER STEERING SYSTEM: C1551: IG Power Supply Voltage Malfunction

DTC C1551 - IG Power Supply Voltage Malfunction

DESCRIPTION

The power steering ECU distinguishes the ignition switch status as on (IG) or off through the IG power source circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (IG POWER SUPPLY)
(a) Turn the ignition switch off.
(b) Connect Techstream to the DLC3.
(c) Turn the ignition switch on (IG).
(d) Turn Techstream on.
(e) Enter the following menus: Chassis / EMPS / Data List.
(f) Select the item "IG Power Supply" in the Data List and read the value displayed on Techstream.

EMPS:

OK:
The normal condition value is displayed on Techstream.
NG -- INSPECT FUSE (ECU IG NO. 1)
OK -- CHECK INTERMITTENT PROBLEMS
2. INSPECT FUSE (ECU IG NO. 1)
(a) Remove the ECU IG NO. 1 fuse from the instrument panel junction block.
(b) Measure the resistance of the fuse.
OK:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - BATTERY)

(a) Disconnect the connectors from the power steering ECU.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE POWER STEERING ECU