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DTC P0400: Exhaust Gas Recirculation Flow Malfunction
Wiring Diagram
+B
BLK/RED
DTC Detecting Condition and Possible Cause
• While running at specified vehicle speed after engine warm-up.
• During deceleration (engine speed high with closed throttle position ON) in
which fuel cut is involved, difference in intake manifold absolute pressure
between when EGR valve is opened at specified value and when it is
closed is larger or smaller than specified value.
*2 driving cycle detection logic, monitoring once / 1 driving
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 with 2
persons, a driver and a tester, on a level
road.
1
2
5
C41 (31P)
9
8
7
6
5
4
3
2
1
21
20
19
18
17
16
15
14
13
12
11
10
31
30
29
28 27
26
25
24
23
22
1. EGR value
DTC detecting condition
Engine General Information and Diagnosis:
3
C41-18
GRY
1
GRY/WHT
C41-29
4
C41-17
GRY/YEL
6
BRN/WHT
C41-28
BLK/ORN
C41-1
BLK
C41-3
G04 (24P)
G03 (17P)
6
5
7
6
5
4
3
2
1
12
11
16
15
14
13 12
11
10
9
8
24
23
22
21
20
19
18
17
17
16
NOTE
Check to make sure that the following
conditions are satisfied when using this DTC
confirmation procedure.
• Altitude (barometric pressure): 2400 m,
8000 ft or less (560 mmHg, 75 kPa or more)
• Ambient temp.: –10 °C, 14 °F or higher
• Intake air temp.: 70 °C, 158 °F or lower
1) Turn ignition switch OFF.
Clear DTC with ignition switch ON.
2) Start engine and warm it up to normal operating
temperature (70 – 110 °C, 158 – 230 °F) and run it at
idle for 5 min.
3) Increase vehicle speed to 80 – 88 km/h, 50 – 55 mph
in 5th gear or in "D" range.
4) Hold throttle valve at that opening position for 2 min.
or longer.
5) Increase engine speed to 4000 r/min. in 3rd gear or
in "2" range.
ECM
12 V
12 V
12 V
12 V
4
3
2
1
10
9
8
7
15
14
13
Possible cause
• EGR valve or its circuit
• EGR passage
• ECM
1A-84
S3RH0A1104040
I2RH0B110055-01
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