GDI <4G9> -
Troubleshooting
13B-81
Wave Pattern Observation Points
Check that the standard wave pattern appears when the ISC servo is operating.
Point A: Presence or absence of induced electromotive force from the motor turning. (Refer to the abnormal
wave pattern.)
Contrast with standard wave pattern
Probable cause
Induced electromotive force does not appear or is extremely small.
Motor is malfunctioning
Point B: Height of coil reverse electromotive force
Contrast with standard wave pattern
Probable cause
Coil reverse electromotive force does not appear or is extremely small. Short in the coil
Examples of Abnormal Wave Pattern
D
Example 1
Cause of problem
Motor is malfunctioning. (Motor is not operating.)
Wave pattern characteristics
Induced electromotive force from the motor turning does
not appear.
D
Example 2
Cause of problem
Open circuit in the line between the ISC servo and the
engine-ECU
Wave pattern characteristics
Current is not supplied to the motor coil on the open
circuit side. (Voltage does not drop to 0 V.)
Furthermore, the induced electromotive force waveform
at the normal side is slightly different from the normal
waveform.
Open
circuit
side
Normal
side
Summary of Contents for Space Runner 1998
Page 35: ...ENGINE 4G6 11A ENGINE 4G9 11B 11A 1 ENGINE CONTENTS 11109000276...
Page 74: ...NOTES...
Page 354: ...NOTES...
Page 355: ...13C 1 FUEL SUPPLY CONTENTS 13509000197 GENERAL INFORMATION 2 FUEL TANK 3...
Page 418: ...NOTES...
Page 436: ...NOTES...
Page 460: ...NOTES...
Page 532: ...NOTES...
Page 567: ...REAR AXLE 2WD 27A REAR AXLE 4WD 27B 27A 1 REAR AXLE CONTENTS 27109000246...
Page 660: ...NOTES...
Page 714: ...NOTES...
Page 722: ...NOTES...
Page 732: ...NOTES...
Page 772: ...NOTES...
Page 912: ...NOTES...
Page 954: ...NOTES...