EN(H4DOTC)(diag)-244
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR COMBINATION VALVE
RELAY 2 CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Remove the secondary air combination
valve relay 2.
4) Measure the resistance of harness between
ECM connector and secondary air combination
valve relay 2 connector.
Connector & terminal
(B135) No. 20 — (F9) No. 9:
Is the resistance less than 1 Ω? Go to step
2.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM
connector
and secondary air
combination valve
relay 2 connector
• Poor contact of
coupling connector
2
CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR COMBINATION VALVE
RELAY 2 CONNECTOR.
Measure the resistance between ECM connec-
tor and chassis ground.
Connector & terminal
(B135) No. 20 — Chassis ground:
Is the resistance 1 MΩ or
more?
Even if DTC is
detected, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the failure,
and then perform
the diagnosis
again.
NOTE:
In this case, tem-
porary poor con-
tact of connector,
temporary open or
short circuit of har-
ness may be the
cause.
Repair the short
circuit to ground in
harness between
ECM connector
and secondary air
combination valve
relay 2 connector.