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6-94 ENGINE GENERAL INFORMATION AND DIAGNOSIS
DTC P0400 EXHAUST GAS RECIRCULATION FLOW MALFUNCTION
WIRING DIAGRAM / CIRCUIT DESCRIPTION
[A]
+B
1
BLK/RED
2
5
1. EGR valve
[A] : Case of TYPE A is shown (See NOTE)
NOTE:
For TYPE A and TYPE B, refer to NOTE in "ECM VOLTAGE VALUES TABLE" for applicable model.
DTC DETECTING CONDITION
• 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 abso-
lute 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 acci-
dent 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) Turn ignition switch OFF.
Clear DTC with ignition switch ON, check vehicle and environmental condition for :
– 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, 122°F or lower
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 50 – 55 mph, 80 – 88 km/h 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.
6) Release accelerator pedal and with engine brake applied, keep vehicle coasting (fuel cut condition) till
engine speed reaches 1500 r/min.
ECM
3
GRN
C41-2
1
GRN/ORN
C41-9
4
WHT/RED
C41-8
6
BRN/YEL
C41-17
BLK/ORN
C42-1
BLK/ORN
C42-3
C42 (31P)
9
8
7
6
5
4
3
21
20
19
18
17
16
15
14
13
12
31
30
29
28 27
26
25
24
[B]
+B
BLK/RED
2
5
C41 (24P)
2
1
7
6
5
4
3
2
1
11
10
16
15
14
13 12
11
10
9
8
23
22
24
23
22
21
20
19
18
17
[B] : Case of TYPE B is shown (See NOTE)
1
3
C42-18
GRY
1
GRN/ORN
C42-29
4
C42-17
WHT/RED
6
C42-28
BRN/YEL
BLK/ORN
C42-1
BLK/ORN
C42-3
G02 (17P)
6
5
4
3
2
1
12
11
10
9
8
7
17
16
15
14
13
POSSIBLE CAUSE
• EGR valve or its circuit
• EGR passage
• ECM
ECM
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