FAILURE DIAGNOSIS
1-98
TNV DI Service Manual
DTCs (Diagnostic Trouble Codes) General Description
(8) P1433/3: Failure B with EGR valve (Step Motor D-phase)
DTC Detecting Conditions
Movement at Error occurrence
Estimation of Failure cause/Error condition
• The connector may not be properly connected.
• Wiring defect of the harness
•
The EGR step motor D-phase wiring may be short-circuited with POWER SUPPLY.
•
The EGR step motor wiring may be short-circuited between phases.
• The EGR step motor may be faulty.
•
Inner wiring of the EGR step motor D-phase may be short-circuited with POWER SUPPLY.
•
Inner wiring of the EGR step motor may be short-circuited between phases.
• The E-ECU internal circuitry may be faulty.
DTC
P1433/3
Failure B with EGR valve (Step Motor D-Phase)
1 - Precondition; 2 - Detecting condition(s);
3 - Flashing pattern of failure indicator
Check points
1. Key switch ON.
2. Make an assessment logically as to followings.E-ECU detects
the EGR step motor D-phase turning OFF during the command
to turn ON the EGR step motor D-phase.
3. One flash followed by three flashes.
Connector
Harness
EGR valve (step motor)
E-ECU
Movement setting at the EGR step motor error
Unavailable
Available
Error Mode
[Run As Is]:
After detecting the error, the system lets
the engine continue to run without any
restrictions.
[Run Under Restrictions]:
The engine continues to run under
restrictions.
Run restricted?
No.
Yes: The system restricts the High idle
speed or engine power.
Recovery
Conditions
No.
No.
Remarks
TNV_DI_SM_A4-Troubleshooting.book 98 ページ ２００７年１１月１５日 木曜日 午後５時２７分
