EN(H6DO)-98
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1) Start engine, and warm-up the engine.
2) Turn ignition switch to OFF.
3) Disconnect connectors from ECM and front
oxygen (A/F) sensor.
4) Measure resistance of harness between
ECM and front oxygen (A/F) sensor con-
nector.
Connector & terminal
(B137) No. 4 — (E47) No. 1:
(B137) No. 5 — (E47) No. 1:
Is the measured value less than the speci-
fied value?
1
Ω
Go to step 2.
Repair open circuit
in harness
between ECM and
front oxygen (A/F)
sensor connector.
2
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
Measure resistance of harness between ECM
and front oxygen (A/F) sensor connector.
Connector & terminal
(B137) No. 19 — (E47) No. 4:
Is the measured value less than the specified
value?
1
Ω
Go to step 3.
Repair open circuit
in harness
between ECM and
front oxygen (A/F)
sensor connector.
3
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
Measure resistance of harness between ECM
and front oxygen (A/F) sensor connector.
Connector & terminal
(B137) No. 29 — (E47) No. 3:
Is the measured value less than the specified
value?
1
Ω
Go to step 4.
Repair open circuit
in harness
between ECM and
front oxygen (A/F)
sensor connector.
4
CHECK FRONT OXYGEN (A/F) SENSOR.
Measure resistance between front oxygen (A/
F) sensor connector terminals.
Terminals
No. 2 — No. 1:
Is the measured value less than the specified
value?
5
Ω
Go to step 5.
Replace front oxy-
gen (A/F) sensor.
<Ref. to
FU(H6DO)-43,
Front Oxygen (A/
F) Sensor.>
5
CHECK POOR CONTACT.
Check poor contact in ECM and front oxygen
(A/F) sensor connector.
Is there poor contact in ECM or front oxygen
(A/F) sensor connector?
There is poor contact.
Repair poor con-
tact in ECM or
front oxygen (A/F)
sensor connector.
Replace front oxy-
gen (A/F) sensor.
<Ref. to
FU(H6DO)-43,
Front Oxygen (A/
F) Sensor.>