FUEL SYSTEM Troubleshootinn
DIAGNOSIS CHART (FAULT TREE)
output
Diagnosis code
Diagnosis item
Check item (Remedy)
order
Output signal pattern
No.
Memory
1
Engine control
unit
(Replace engine control
unit)
2
Oxygen sensor
Retained
l
Harness and connector
(Turbo: Rear bank)
Oxygen sensor
l
Fuel pressure
l
Injectors
(Replace if defective.)
l
Intake air leaks
3
Air flow sensor
Retained
l
Harness and connector
(If harness and connector
are normal, replace air
flow sensor assembly.)
4
Intake air
Retained
l
Harness and connector
temperature sensor
H
l
Intake air temperature
sensor
5
Throttle position
sensor
Retained
l
Harness and connector
l
Throttle position sensor
l
Idle position switch
6
Coolant temperature
Retained
l
Harness and connector
sensor
Coolant temperature
sensor
7
Crank angle sensor
Retained
l
Harness and connector
(If harness and connector
are normal, replace crank
angle sensor assembly.)
8
Top dead center
Retained
l
Harness and connector
sensor
(If harness and connector
are normal. replace crank
angle sensor assembly.)
9
Vehicle speed sensor
24
Retained
l
Harness and connector
(reed switch)
H
l
Vehicle speed sensor
(reed switch)
L
Barometric pressure
25
Retained
l
Harness and connector
sensor
H
I
(If harness and connector
are normal, replace
L
barometric pressure
sensor assembly.)
11
Detonation sensor
31
Retained
l
Harness and connector
(If harness and connector
are normal, replace deto-
nation sensor.)
NOTE
Replace the engine control unit if a malfunction code is output although the inspection reveals that there is no problem with the check
items.
TSB Revision
Summary of Contents for 3000GT 1991
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Page 604: ...27 8 REAR AXLE AWD Special Tools SPECIAL TOOLS MZ DA MB990799 01 TSB Revision...
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Page 876: ...42 4 BODY SDecial Tools SPECIAL TOOLS M42DA remover TSB Revision...
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Page 942: ...EXTERIOR SDecial Tools SPECIAL TOOLS MBlKG I system inspectlon MB991 359 TSB Revision...
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