Code 0901
SYSTEM DESCRIPTION
The ECM performs ON/OFF control of the front heated oxygen sensor heaters corresponding to the engine speed.
OPERATION
CONSULT REFERENCE VALUE IN DATA MONITOR MODE OPERATION
- Specification data are reference values.
ECM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values and are measured between each terminal and (ECCS ground) with a voltmeter
ON BOARD DIAGNOSIS LOGIC
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 at least 5 seconds at idle speed.
OR
With Generic Scan Tool
(1) Start engine and run it 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
Without Scan Tool
(1) Start engine and run it at least 5 seconds in idle condition.
(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.
- 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-FO2H-R-01 Front Heated Oxygen Sensor Heater (Right Bank) (DTC: P0135):
Front Heated Oxygen Sensor Heater (Right Bank) (DTC: P0135):
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), (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.