EN(H4DOTC)(diag)-102
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK POWER SUPPLY TO REAR OXY-
GEN SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from rear oxygen
sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between rear oxygen
sensor connector and engine ground.
Connector & terminal
(T6) No. 2 (+) — Engine ground (–):
Is the voltage 10 V or more?
Go to step
2
.
Repair the power
supply line.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
A/F, oxygen sen-
sor relay and rear
oxygen sensor
connector
• Poor contact of
A/F, oxygen sen-
sor relay connector
• Poor contact of
coupling connector
• Malfunction of A/
F, oxygen sensor
relay
2
CHECK HARNESS BETWEEN ECM AND
REAR OXYGEN SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Measure the resistance between the ECM
and rear oxygen sensor connector.
Connector & terminal
(B136) No. 4 — (T6) No. 1:
Is the resistance less than 1
:
? Go to step
3
.
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
3
CHECK GROUND CIRCUIT FOR ECM.
Measure the resistance of harness between
ECM and chassis ground.
Connector & terminal
(B134) No. 5 — Chassis ground:
(B137) No. 1 — Chassis ground:
(B137) No. 2 — Chassis ground:
(B137) No. 3 — Chassis ground:
(B137) No. 7 — Chassis ground:
Is the resistance less than 5
:
? Go to step
4
.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and engine
ground
• Poor contact of
ECM connector
• Poor contact of
coupling connector
4
CHECK REAR OXYGEN SENSOR.
Measure the resistance between rear oxygen
sensor terminals.
Terminals
No. 1 — No. 2:
Is the resistance 5 — 7
:
?
Repair the poor
contact of ECM
connector.
Replace the rear
oxygen sensor.
<Ref. to
FU(H4DOTC)-50,
Rear Oxygen Sen-
sor.>
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