DTC 0901

SYSTEM DESCRIPTION
The ECM performs ON/OFF control of the front heated oxygen sensor heater corresponding to the engine conditions.




DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
WITH CONSULT
(1) Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT.
(2) Start engine and run it for at least 5 seconds at idle speed.

OR

WITH GST
(1) Start engine and run it for at least 5 seconds at idle speed.
(2) Select "MODE 3" with GST.

OR

WITH NO TOOLS
(1) Start engine and run it for at least 5 seconds at idle speed.
(2) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(3) Perform "Diagnostic Test Mode II" (Self-diagnostic results) with ECM.

Front Heated Oxygen Sensor Heater (DTC: 0901):

WIRING DIAGRAM




DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION




1. Check resistance between terminals (3) and (1).

Resistance: 3.3 - 6.3 Ohms at 25°C (77°F)

2. Check continuity between terminals (2) and (1), (3) and (2).

Continuity should not exist.

3. If NG, replace the front heated oxygen sensor.

CAUTION:
- Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.