DTC P0403: Exhaust Gas Recirculation Control Circuit - Suzuki Jimny Workshop Manual
1A
DTC P0403: Exhaust Gas Recirculation Control Circuit
Wiring Diagram
| 1. | Main relay | 3. | Relay box | 5. | ECM | 7. | “FI” fuse |
| 2. | EGR valve | 4. | Ignition switch | 6. | “IG” fuse | 8. | “IGN1” fuse |
DTC Detecting Condition and Trouble Area
| 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 |
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.
• Road test should be carried out with 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
| Step | Action | YES | NO |
|---|---|---|---|
| 1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
| 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 terminals of EGR valve connector and vehicle body ground.
Is check voltage 10 – 14 V?
|
Go to Step 3.
|
“BLU/BLK” wire in 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 “GRY/BLK”, “GRY/BLU”, “GRY/RED”, “GRY” wire terminals of EGR valve connector.
Is each voltage 0 V?
|
Go to Step 4.
|
Faulty wire(s) shorted to other circuits. If wires are OK, substitute a known-good ECM and recheck.
|
| 4 |
Wire circuit check
1)
With ignition switch turned OFF, measure resistance between engine ground and each “GRY/ BLK”, “GRY/BLU”, “GRY/RED”, “GRY” wire terminals of EGR valve connector.
Is resistance infinity?
|
Go to Step 5.
|
Faulty wire(s) shorted to ground circuit. If wires are OK, substitute a known-good ECM and recheck.
|
| 5 |
Short circuit check for EGR valve control circuit
1)
With ignition turned OFF, measure resistance between each EGR valve control circuit wire (“GRY/BLK”, “GRY/BLU”, “GRY/RED” and “GRY” wire) and each EGR valve control circuit wire.
Are they each resistance infinity?
|
Go to Step 6.
|
Faulty wire in short circuit.
|
| 6 |
EGR valve stepper motor coil circuit check
1)
With ignition switch turned OFF, connect EGR valve connector.
2)
Measure resistance between “E118-5/6” and each “E117-33”, “E117-16”, “E117-34”, “E11717” terminals of ECM connector.
Is each resistance 20 – 31 Ω at 20 °C, 68 °F?
|
Faulty ECM substitute a known-good ECM and recheck.
|
Go to Step 7.
|
| 7 |
EGR valve check
1)
Check EGR valve resistance referring to
EGR Valve Inspection:M13A
.
Is resistance within specified value?
|
Faulty wire(s) in open or high resistance circuit. If wires are OK, substitute a known-good ECM and recheck.
|
Faulty EGR valve.
|
NOTE:
Upon completion of inspection and repair work, perform “DTC Confirmation Procedure” and confirm that the trouble has been corrected.