ENGINE DIAGNOSIS (RHZ ENGINE WITH SINGLE-CONNECTOR ECM) 6-53
DTC P0401 (P0903) EGR SOLENOID VALVE FLOW INSUFFICIENT DETECTED
DTC P0402 (P0903) EGR SOLENOID VALVE FLOW EXCESSIVE DETECTED
DTC CONFIRMATION PROCEDURE
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ON ignition switch and clear DTC, pending DTC and freeze flame data by using scan tool.
3) Run engine between 700 and 2700 rpm for 10 or more.
4) Check DTC and pending DTC by using scan tool.
TROUBLESHOOTING
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE”.
2 Check EGR vacuum circuit and intake air circuit for
leak.
Is it in good condition?
Go to Step 3. Repair or replace.
3 Check EGR valve referring to “EGR VALVE” in
Section 6E3.
Is it in good condition?
Go to Step 4. Faulty EGR valve.
4 Check EGR solenoid valve for resistance referring to
“EGR SOLENOID VALVE” in Section 6E3.
Is resistance as specified?
Substitute a known-
good ECM and
recheck.
Replace EGR
solenoid valve.
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