DTC P0134 HEATED OXYGEN SENSOR 1 (FRONT) (PLAUSIBILITY); Component Inspection

EF & EC-7124prose procedure

Source typo: Without-CONSULT-II step 2 says "ECM terminal 62" but the SEF660Z diagram shows terminal 12 — same as other HO2S1 pages. Max voltage spec is 1.0V (matches P0131/P0133 ECM-Terminals table) but conflicts with P0130's 1.08V. With-CONSULT-II step 2 correctly says HO2S1 MNTR (B1) on this page (unlike the "HO2S1 MTR" typo on P0130/P0133 pages).

Continued from EF & EC-7123

CG10, CGA3

Component Inspection

HEATED OXYGEN SENSOR 1 (FRONT)

With CONSULT-II

1
Start engine and warm it up to normal operating temperature.
2
Select "MANU TRIG" and "HI SPEED" in "DATA MONITOR" mode, and select "HO2S1 (B1)" and "HO2S1 MNTR (B1)".
3
Hold engine speed at 2,000 rpm under no load during the following steps.
4
Touch "RECORD" on CONSULT-II screen.
5
Check the following. - "HO2S1 MNTR (B1)" in "DATA MONITOR" mode changes from "RICH" to "LEAN" to "RICH" 3 times in 10 seconds. 3 times (cycles) are counted as shown below: R = "HO2S1 MNTR (B1)", "RICH" L = "HO2S1 MNTR (B1)", "LEAN" - "HO2S1 (B1)" voltage goes above 0.6V at least once. - "HO2S1 (B1)" voltage goes below 0.3V at least once. - "HO2S1 (B1)" voltage never exceeds 1.0V.

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.

Without CONSULT-II

1
Start engine and warm it up to normal operating temperature.
2
Set voltmeter probes between ECM terminal 62 [Heated oxygen sensor 1 (front) signal] and engine ground.
3
Check the following with engine speed held at 2,000 rpm constant under no load. - The voltage fluctuates between 0 to 0.3V and 0.6 to 1.0V more than three times within 10 seconds. 1 time: 0 - 0.3V → 0.6 - 1.0V → 0 - 0.3V 2 times: 0 - 0.3V → 0.6 - 1.0V → 0 - 0.3V → 0.6 - 1.0V → 0 - 0.3V - The maximum voltage is over 0.6V at least one time. - The minimum voltage is below 0.3V at least one time. - The voltage never exceeds 1.0V.