Mitsubishi 1992 3000GT, Service Manual

Page: 124 / 1308

MULTIPORT FUEL INJECTION Troubleshooting
Caution
If the sensor connector is disconnected with the ignition
switch turned on, the diagnostic trouble code is memo-
rized. In this case, send the diagnostic trouble code erase
signal from the scan tool to the engine control module
or disconnect the battery terminal
for seconds or
more, and the diagnostic memory will be erased.
The 23 diagnostic items are provided as follows, and if plural
items are activated, they are all indicated sequentially from
the smallest code number.
Caution
The diagnostic trouble code for the ignition timing adjust-
ment signal is output when the line of the ignition timing
adjustment terminal is shorted to ground. Therefore, the
diagnostic trouble code is also output when the ignition
timing adjustment terminal is grounded to adjust the igni-
tion timing, but this does not show any abnormality.
DIAGNOSTIC CHART (FAULT TREE)
Code No.
Output signal pattern Diagnostic item
Engine control module
otherthan 1994andlaterCalifomia
12 Volume air flow sensor
Intake air temperature sensor
Check item (Remedy)
l
Fuse
l
Harness and connector
l Ground (Replace ECM if power
ground available)
l
Harness and connector
l Heated oxygen sensor
l
Fuel pressure
Injectors
(Replace if defective
Intake air leaks
l
Harness and connector
(If harness and connector are
normal, replacevolumeairflow
sensor assembly.)
l
Harness and connector
l
Intake air temperature sensor
l
Harness and connector
l
Throttle position sensor
l Closed throttle position switch
NOTE
Do not replace the ECM until a thorough terminal check reveals there are no short/open circuit.
Retained
Retained
Retained
Memory
Retained
TSB Revision