EN(H4SO 2.5)(diag)-197
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK POWER SUPPLY TO EGR SOLE-
NOID VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from EGR sole-
noid valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between EGR sole-
noid valve connector and engine ground.
Connector & terminal
(E18) No. 2 (+) — Engine ground (
−
):
(E18) No. 5 (+) — Engine ground (
−
):
Is the voltage more than 10 V? Go to step 2.
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit of
harness between
EGR solenoid
valve and main
relay connector
• Poor contact in
coupling connector
2
CHECK HARNESS BETWEEN ECM AND
EGR SOLENOID VALVE CONNECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between ECM and
EGR solenoid valve connector.
Connector & terminal
DTC P1492; (B134) No. 11 — (E18) No. 3:
DTC P1494; (B134) No. 10 — (E18) No. 1:
DTC P1496; (B134) No. 9 — (E18) No. 4:
DTC P1498; (B134) No. 8 — (E18) No. 6:
Is the resistance less than 1
Ω?
Go to step 3.
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit of
harness between
ECM and EGR
solenoid valve
connector
• Poor contact in
coupling connector
3
CHECK HARNESS BETWEEN ECM AND
EGR SOLENOID VALVE CONNECTOR.
1) Disconnect the connector from ECM.
2) Measure the resistance between ECM con-
nector and chassis ground.
Connector & terminal
DTC P1492; (B134) No. 11 — Chassis
ground:
DTC P1494; (B134) No. 10 — Chassis
ground:
DTC P1496; (B134) No. 9 — Chassis
ground:
DTC P1498; (B134) No. 8 — Chassis
ground:
Is the resistance more than 1
M
Ω?
Go to step 4.
Repair the ground
short circuit in har-
ness between
ECM and EGR
solenoid valve
connector.
4
CHECK POOR CONTACT.
Check poor contact in ECM connector and
EGR solenoid valve connector.
Is there poor contact in ECM
connector or EGR solenoid
valve connector?
Repair the poor
contact in ECM
connector or EGR
solenoid valve
connector.
Replace the EGR
solenoid valve.
<Ref. to FU(H4SO
2.5)-31, EGR
Valve.>