DTC 0902

SYSTEM DESCRIPTION
The ECM performs ON/OFF control of the rear heated oxygen sensor heaters corresponding to the engine speed.

OPERATION
Engine Speed rpm / Rear heated oxygen sensor heaters
Above 2,800 / OFF
Below 2,800 / ON




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) Turn ignition switch "OFF" and wait at least 5 seconds.
(3) Start engine and run it for at least 5 seconds at idle speed.
(4) Select "Mode 3" with GST.

OR

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 11 (Self-diagnostic results)" with ECM.
- When using GST, "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" should be performed twice as much as when using CONSULT or ECM (Diagnostic Test Mode II) because GST cannot display MODE 7 (1st trip DTC) concerning this diagnosis. Therefore, using CONSULT or ECM (Diagnostic Test Mode II) is recommended.

EC-RRO2/H-01 Rear Heated Oxygen Sensor Heater (DTC P0141):

WIRING DIAGRAM




DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION
Rear Heated Oxygen Sensor Heater.
Check the following.




1. Check resistance between terminals (4) and (1).

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

2. Check continuity.

Terminal No. / Continuity
(2) and (1),(3),(4) / No
(2) and (1),(2),(4) / ___

If NG, replace the rear 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.