Engine General Information and Diagnosis: 1A-136
DTC P0403: Exhaust Gas Recirculation Control Circuit
S5JB0A1104043
Wiring Diagram
Refer to “DTC P0401 / P0402: Exhaust Gas Recirculation Flow Insufficient Detected / Excessive Detected: ”.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
WARNING
!
• When performing a road test, select a place where there is no traffic or possibility of a traffic
accident and be very careful during testing to avoid occurrence of an accident.
• Road test should be carried out by 2 persons, a driver and a tester, on a level road.
1) With ignition switch turned OFF, connect scan tool to DLC.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and warm it up to normal operating temperature.
4) Drive vehicle in 2000 – 3500 rpm of engine speed.
5) Keep above vehicle speed for 1 min. (Throttle valve opening is kept constant in this step.)
6) Stop vehicle and check DTC and pending DTC.
DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions For DTC Troubleshooting: ”.
DTC detecting condition
Trouble area
EGR valve output voltage is different from output command with more
than one pole out of 4 poles.
(1 driving cycle detection logic)
• EGR valve circuit open
• EGR valve
• ECM
Step
Action
Yes
No
1
Was “Engine and Emission Control System Check”
performed?
Go to Step 2.
Go to “Engine and
Emission Control
System Check: ”.
2
EGR valve power supply circuit check
1) With ignition switch turned OFF, disconnect EGR valve
connector.
2) With ignition switch turned ON, measure voltage
between “BLU/BLK” wire terminal of EGR valve
connector and vehicle body ground.
Is check voltage 10 – 14 V?
Go to Step 3.
“BLU/BLK” wire is open
circuit.
3
Wire circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Turn ON ignition switch.
3) Measure voltage between engine ground and each
“YEL/BLK”, “YEL/RED”, “YEL/GRN”, “YEL” wire
terminals of EGR valve connector.
Is each voltage 0 V?
Go to Step 4.
Faulty wire(s) are
shorted to other circuit.
If wires are OK,
substitute a known-
good ECM and recheck.
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