DTC 1001

Front Heated Oxygen Sensor Heater (Left bank) (DTC: 1001)
SYSTEM DESCRIPTION
The ECM performs ON/OFF control of the front heated oxygen sensor heaters corresponding to the engine speed.




OPERATION




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

Without Scan 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.




WIRING DIAGRAM




DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION
Front heated oxygen sensor heater




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

Resistance: 2.3 - 4.3 Ohms at 25°C (77°F)

Check continuity between terminals (2) and (1), and (3) and (2).
Continuity should not exist.
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.