EN(H6DO)(diag)-237
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
6
CHECK HARNESS BETWEEN ECM AND
REAR OXYGEN SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
rear oxygen sensor.
3) Measure the resistance of harness between
ECM and rear oxygen sensor connector.
Connector & terminal
(B135) No. 4 — (E61) No. 3:
(B135) No. 30 — (E61) No. 4:
(B135) No. 15 — (E25) No. 3:
(B135) No. 30 — (E25) No. 4:
Is the resistance less than 1
:? Go to step 7.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM and rear oxy-
gen sensor con-
nector
• Poor contact of
coupling connector
7
CHECK HARNESS BETWEEN ECM AND
REAR OXYGEN SENSOR CONNECTOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between rear oxygen
sensor connector and chassis ground.
Connector & terminal
(E61) No. 3 (+) — Chassis ground (–):
(E25) No. 3 (+) — Chassis ground (–):
Is the voltage 0.2 — 0.5 V?
Go to step 8.
Repair the harness
and connector.
NOTE:
Repair the follow-
ing locations.
• Open circuit of
harness between
the ECM and rear
oxygen sensor
• Poor contact in
ECM and rear oxy-
gen sensor
• Poor contact in
ECM connector
8
CHECK REAR OXYGEN SENSOR SHIELD.
1) Turn the ignition switch to OFF.
2) Expose the rear oxygen sensor connector
body side harness sensor shield.
3) Measure the resistance between the sensor
shield and chassis ground.
Is the resistance less than 1
:? Replace the rear
oxygen sensor.
<Ref. to
FU(H6DO)-34,
Rear Oxygen Sen-
sor.>
Repair the open
circuit in the rear
oxygen sensor har-
ness.
Step
Check
Yes
No