DTC 29

CIRCUIT DESCRIPTION
The sub heated oxygen sensor is installed on the exhaust pipe. Its construction and operation is the same as the main heated oxygen sensor.








DETECTING CONDITION AND TROUBLE AREA

HINT:
- Diagnostic trouble code 27 is for the left bank sub-heated oxygen sensor circuit.
- Diagnostic trouble code 29 is for the right bank sub-heated oxygen sensor circuit.

NOTE: (*) This indicates items for which "2 trip detection logic" is used. With this logic, when a logic malfunction is first detected, the malfunction is temporarily stored in the ECM memory. If the same case is detected again during the second drive test, this second detection causes the malfunction indicator lamp to light up.
The 2 trip repeats the same mode a 2nd time. (However, the IG switch must be turned OFF between the 1st trip and 2nd trip).
In the Test Mode, the malfunction indicator lamp lights up the 1st trip a malfunction is detected.

DIAGNOSIS TROUBLE CODE DETECTION DRIVING PATTERN:

Purpose of the driving pattern:
- To simulate diagnostic trouble code detecting condition after diagnostic trouble code is recorded.
- To check that the malfunction is corrected when the repair is completed confirming that diagnostic trouble code is no longer detected.

Malfunction: Open or Short in Sub Oxygen Sensor.

1. Disconnect the EFI fuse (30 A) for 10 sec. or more, with IG switched OFF. Initiate test mode (Connect terminal TE2 and E1 of data link connector 2 with IG switched OFF).
2. Start the engine and warm up, with all accessories switched OFF.
3. After engine is warmed up, let it idle for 3 min.
4. With the A/C ON and the transmission in D position (O/D OFF), drive at 64 - 96 km/h (40 - 60 mph) for 6 min.
5. After the driving in 04 , stop the vehicle.
6. Once the vehicle is stopped, within the next minute apply acceleration with the throttle fully open for 4 sec.

HINT: If malfunction exists, the malfunction indicator lamp will light up after full acceleration for 4 sec.

NOTICE: If the conditions in this test are not strictly followed, detection of the malfunction will not be possible.





DIAGNOSTIC CHART

HINT:
- When other codes are output in addition to 27 and 29 at the same time, check the circuits for other codes first.
- If diagnostic trouble code 27 is displayed, check left bank sub heated oxygen sensor circuit, and if 29 is displayed, check right bank sub heated oxygen sensor circuit.





WIRING DIAGRAM











INSPECTION PROCEDURE