ignition MITSUBISHI 3000GT 1991 Service Manual

55-52FULL AUTO AIR CONDITIONER - Troubleshooting
7. Inspection of power transistor and blower motor relay circuitsllower
Potor t?lay
El12
3 4
Ignitionswitch IG2Blower motor
relay
Air conditioner
-control panel
IWY/\2’
a.T
Air conditioner control unit
Fan speed anth-mete circw
)lardiatlon‘nsor2OFOO59
Troubleshooting Hintsl Air conditioner control unit terminal voltages
Power transistor baseTSB Revision

FULL AUTO AIR CONDITIONER - Troubleshootina55-53r
---.__------
2OFOO8:
SELF-DIAGNOSIS CHECKING
Self-diagnosis checking is performed when there has been anautomatic cancellation, without cancel switch operation.
The following method can be used for checking the diagnosis.
Note that the diagnosis check connector is located under the
driver’s side instrument panel.When multi-use tester is used
(1) Read and record the self-diagnosis outputs.
(2) Repair the faulty spots by referring to diagnosis chart.
(3) Erase the failure code.(4) Check the system again.
When voltmeter is used
(1) Connect an analog voltmeter across the self-diagnosis
output terminal @ and ground terminal @ of the diagnosis
connector.(2) Turn ON the ignition switch.
(3) According to the voltmeter pointer deflection, read the
self-diagnosis pattern.(4) Referring to the diagnosis chart, repair the faulty spot.
(5) Erase the failure code by the following procedure.
@ Turn OFF the ignition switch.
@ Disconnect the battery cable from a battery terminal
and leave it disconnected for 10 seconds or more; then,
reconnect the cable.
@ Turn ON the ignition switch and read the self-diagnosiscode to check that the correct code is being output.
1 TSB Revision

FULL AUTO AIR CONDITIONER - Troubleshootina55-55
DIAGNOSISDISPLAY PAlTERNS AND CODES
/
L
ii
CodeDisplay pattern (output codes)CauseFail safe(use with voltmeter)
0Normal
ON
OFFContinuous
I1 n
Open-circuited room-temperature sensorCondition in which 25°C
(77°F) is detected
I2 n
Short-circuited room-temperature sensor
I3 n
Open-circuited outside-air sensorCondition in which 20°C
(68°F) is detected
I4 n
Short-circuited outside-air sensor
12A0104
21 -,llJlL
Open-circuited air therm0 sensorCondition in which -2°C(-35.6”F) is detected
22 nn
Short-circuited air therm0 sensor
31 J-[-u1 1Short-circuited and open-circuitedair mix damper potentiometerMAX. HOT(or MAX. COOL when itis at MAX. COOL)
32 nnn
Short-circuited and open-circuitedDEF.mode selector damper potentiometer(or FACE when it isat FACE)
12A0107
41, nnnn
Defective air mix damper motor
42Defective mode selector damper motor
1uuuI nn12A0105
NOTE:(1) If two or more abnormal conditions occur at the same time, the code numbers are alternately displayed, in
order, repeatedly.
(2) The nature of the malfunction is entered and stored in the memory from the time the malfunction occurs until
the ignition switch is next turned to OFF.TSB Revision