EN(H4SO)(diag)-100
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK POWER SUPPLY TO FRONT OXY-
GEN (A/F) SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from front oxygen
(A/F) sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between front oxygen
(A/F) sensor connector and engine ground.
Connector & terminal
(E22) No. 6 (+) — Engine ground (–):
Is the voltage 10 V or more?
Go to step
2
.
Repair the power
supply line. Or
replace the main
relay.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
A/F, oxygen sen-
sor relay connector
and front oxygen
(A/F) sensor con-
nector
• Poor contact of
A/F, oxygen sen-
sor relay connector
• Poor contact of
coupling connector
2
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Measure the resistance between ECM and
front oxygen (A/F) sensor connector.
Connector & terminal
(B136) No. 2 — (E22) No. 4:
(B136) No. 3 — (E22) No. 4:
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 front oxy-
gen (A/F) sensor
connector
• 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
coupling connector
4
CHECK FRONT OXYGEN (A/F) SENSOR.
Measure the resistance between front oxygen
(A/F) sensor terminals.
Terminals
No. 6 — No. 4:
Is the resistance 2 — 3
:
?
Repair the poor
contact of ECM
connector.
Replace the front
oxygen (A/F) sen-
sor. <Ref. to
FU(H4SO)-41,
Front Oxygen (A/F)
Sensor.>
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