Edu Relay Diagnosis; Can (Egr 1) Diagnosis - Mitsubishi 6M70 Workshop Manual

P1278: EGR3 (warning lamp: 69)
Generation condition
Recoverability
Control effected by electronic control unit
Service data
Actuator test
Inspection
Electrical equipment
Electric circuit diagram
P1625: EDU Relay (warning lamp flashes: 84)
Generation condition
Recoverability
Control effected by electronic control unit
Service data
Actuator test
Inspection Electronic control unit connector
Electrical equipment
Electric circuit diagram
P1630: CAN (EGR 1) (warning lamp flashes: 95)
Generation condition
Recoverability
Control effected by electronic control unit
Service data
Actuator test
Inspection
Electrical equipment
Electric circuit diagram
Controller area network signal from exhaust gas recirculation electronic drive unit
indicating "magnetic valve (M/V-3) circuit shorted to power source" remains being
received for 2 seconds.
System recovers if controller area network signal from exhaust gas recirculation
electronic drive unit indicating "magnetic valve (M/V-3) is normal" remains being
received for 1 second.
Exhaust gas recirculation control is stopped.
20: Actual EGR Position
A3: EGR3
#530: Exhaust gas recirculation magnetic valve
Exhaust gas recirculation magnetic valve system
Either of the following occurs.
(1) Current flowing in the electronic drive unit relay remains exceeds the speci-
fied value for 1 second.
(2) Electronic drive unit relay circuit remains shorted to ground or open (driving
terminal low level when turned OFF) as detected for 1 second.
(3) Electronic drive unit relay circuit remains shorted to power supply (high level
when turned ON) as detected for 1 second.
• In the case of above problem (1)
• System recovers if current flowing in the electronic drive unit relay remains
lower than the specified value.
• In the case of above problem (2)
• System recovers if current flowing in the electronic drive unit relay remains
normal (driving terminal high level when turned OFF) for 1 second.
• In the case of above problem (3)
• System recovers if current flowing in the electronic drive unit relay remains
normal (driving terminal low level when turned ON) for 1 second.
Exhaust gas recirculation control is stopped.
89: EDU Power Relay
B2: EDU Relay
02 : Electronic drive unit relay
#201: Inspection of relay
Electronic drive unit relay system
Any of the following occurs.
(1) Controller area network signal from exhaust gas recirculation electronic drive
unit 1 indicating "target exhaust gas recirculation opening received from en-
gine electronic control unit is wrong" remains being received for 2 seconds.
(2) No controller area network signal from exhaust gas recirculation electronic
drive unit is received for 1 second.
(3) Engine controller area network signal abnormal state lasts for 0.5 second.
• In the case of above problem (1)
• System recovers if controller area network signal from exhaust gas recircu-
lation electronic drive unit 1 indicating "target exhaust gas recirculation
opening received from engine electronic control unit is normal" remains be-
ing received for 1 second.
• In the case of above problem (2)
• System recovers if controller area network signal from exhaust gas recircu-
lation electronic drive unit remains being received for 0.5 second.
• In the case of above problem (3)
• System recovers if normal engine controller area network signal lasts for
0.5 second.
Exhaust gas recirculation control is stopped.
20: Actual EGR Position 1
A1: EGR 1
Exhaust gas recirculation electronic drive unit and engine electronic control unit
Controller area network communication system between engine electronic con-
trol unit and exhaust gas recirculation electronic drive unit
17
17-13