EN(H4DOTC)(diag)-188
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK OUTPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM connec-
tor and chassis ground.
Connector & terminal
(B134) No. 33 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Go to step
2.
Go to step
3.
2
CHECK FOR POOR CONTACT.
Check for poor contact of ECM connector.
Is there poor contact of ECM
connector?
Repair the poor
contact of ECM
connector.
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 open or
short circuit of har-
ness or temporary
poor contact of
connector may be
the cause.
3
CHECK POWER SUPPLY TO WASTEGATE
CONTROL SOLENOID VALVE.
Measure the voltage between wastegate con-
trol solenoid valve connector and engine
ground.
Connector & terminal
(E64) No. 1 (+) — Engine ground (–):
Is the voltage 10 V or more?
Go to step
4.
Repair the power
supply circuit.
4
CHECK HARNESS BETWEEN ECM AND
WASTEGATE CONTROL SOLENOID VALVE
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
wastegate control solenoid valve.
3) Measure the resistance between wastegate
control solenoid valve connector and engine
ground.
Connector & terminal
(E64) No. 2 — Engine ground:
Is the resistance 1 MΩ or
more?
Go to step
5.
Repair ground
short circuit of har-
ness between
ECM connector
and wastegate
control solenoid
valve connector.
5
CHECK HARNESS BETWEEN ECM AND
WASTEGATE CONTROL SOLENOID VALVE
CONNECTOR.
Measure the resistance of harness between
ECM connector and wastegate control solenoid
valve connector.
Connector & terminal
(B134) No. 33 — (E64) No. 2:
Is the resistance less than 1 Ω? Go to step
6.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM
connector
and
wastegate
control
solenoid
valve connector
• Poor contact of
coupling connector