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Mitsubishi Space Star. Manual - part 111

AUTOMATIC TRANSMISSION –

Troubleshooting <A/T>

23-11

INSPECTION CHART FOR DIAGNOSIS CODE

Code

Diagnosis item

Reference page

Accelerator pedal position sensor system (APS)

Short circuit

23-12

Open circuit

23-12

Sensor maladjustment

23-12

A/T fluid temperature sensor system

Open circuit

23-12

Crank angle sensor system

Open circuit

23-12

Input shaft speed sensor system

Short circuit/open circuit

23-13

Output shaft speed sensor system

Short circuit/open circuit

23-14

Wide open throttle switch system

Short circuit

23-14

Stop lamp switch system

Short circuit/open circuit

23-15

Low and reverse solenoid valve system

Short circuit/open circuit

23-15

Underdrive solenoid valve system

Short circuit/open circuit

23-15

Second solenoid valve system

Short circuit/open circuit

23-15

Overdrive solenoid valve system

Short circuit/open circuit

23-15

Damper control clutch solenoid valve system

Short circuit/open circuit

23-16

1st gear ratio does not meet the specification

23-17

2st gear ratio does not meet the specification

23-17

3rd gear ratio does not meet the specification

23-17

4th gear ratio does not meet the specification

23-17

Reverse gear ratio does not meet the specification

23-17

Abnormal communication with engine-ECU

23-18

Damper control clutch solenoid valve system

Defective defect

23-16

A/T Control relay system

Short circuit to earth/
open circuit

23-18

N range lamp system

Short circuit to earth

23-18

AUTOMATIC TRANSMISSION –

Troubleshooting <A/T>

23-12

INSPECTION PROCEDURES FOR DIAGNOSIS CODES

Code No. 11, 12, 14 Accelerator pedal position sensor
<APS>

Probable cause

If the APS output voltage is 4.8 V or higher when the engine is idling, the output
is judged to be too high and diagnosis code No. 11 is output. If the APS output
voltage is 0.2 V or lower at times other than when the engine is idling, the output
is judged to be too low and diagnosis code No. 12 is output. If the APS output
voltage is 0.2 V or lower or if it is 1.2 V or higher when the engine is idling, the
APS adjustment is judged to be incorrect and diagnosis code No. 14 is output.

Malfunction of the accelerator pedal position sensor

Malfunction of connector

Malfunction of the engine-A/T-ECU

Accelerator pedal position sensor check
(Refer to GROUP 13A – On-vehicle Service.)

Replace

Check the following connectors: B-86, B-89, B-94

Repair

Harness check

Between accelerator pedal position sensor and
engine-A/T-ECU

Repair

Replace the engine-A/T-ECU.

Check the trouble symptoms.

Code No. 15 A/T fluid temperature sensor system

Probable cause

If the oil temperature sensor output voltage is 2.6 V or more even after driving
for 10 minutes or more (if the oil temperature does not increase), it is judged that
there is an open circuit in the A/T fluid temperature sensor and diagnosis code
No. 15 is output.

Malfunction of the A/T fluid temperature sensor

Malfunction of connector

Malfunction of the engine-A/T-ECU

A/T fluid temperature sensor check (Refer to P.23-48.)

Replace

Check the following connectors: A-100, B-87

Repair

Harness check

Between A/T fluid temperature sensor and engine-A/T-ECU

Repair

Check the trouble symptoms.

Replace the engine-A/T-ECU.

Code No. 21 Crank angle sensor system

Probable cause

If no output pulse is detected from the crank angle sensor for 5 seconds or more
while driving at 25 km/h or more, it is judged that there is an open circuit in the
crank angle sensor and diagnosis code No. 21 is output.

Malfunction of the crank angle sensor

Malfunction of connector

Malfunction of the engine-A/T-ECU

Check the following connectors: A-94, B-85

Repair

Harness check

Between crank angle sensor and engine-A/T-ECU

Repair

Check the trouble symptoms.

Replace the engine-A/T-ECU.

Crank angle sensor system check
(Refer to GROUP 13A – Troubleshooting.)

AUTOMATIC TRANSMISSION –

Troubleshooting <A/T>

23-13

Code No. 22 Input shaft speed sensor system

Probable cause

If no output pulse is detected from the input shaft speed sensor for 1 second or
more while driving in 3rd or 4th gear at a speed of 30 km/h or more, there is judged
to be an open circuit or short

circuit in the input shaft speed sensor and diagnosis

code No. 22 is output. If diagnosis code No. 22 is output four times, the transmission
is locked into 3rd gear (D range) or 2nd gear (downshifting at Sports mode) as
a fail

safe measure, and the N range lamp flashes at a frequency of 1 Hz.

Malfunction of the input shaft speed sensor

Malfunction of the underdrive clutch retainer

Malfunction of connector

Malfunction of the engine-A/T-ECU

Replace the engine-A/T-ECU.

Eliminate the cause of the noise.

Check the trouble symptoms.

Check the following harness:

Between the input shaft speed
sensor and the ignition switch

Between the input shaft speed
sensor and engine-A/T-ECU

Repair

Check the trouble symptoms.

Measure output waveform of the input
shaft speed sensor.
(using an oscilloscope)

Engine: 2,000 r/min (approx. 50
km/h)

Transmission: 3rd gear
(Voltage)
OK: Conforms to the waveform

shown at page 23-38 (Inspec-
tion procedure using an oscil-
loscope). There is no noise
in the output waveform.

Replace the input shaft speed sensor.

Measure at the input shaft speed sen-
sor connector A-98.

Disconnect the connector and
measure at the harness side.

(1) Voltage between 3 and earth

(Ignition switch: ON)
OK: System voltage

(2) Voltage between 2 and earth

(Ignition switch: ON)
OK: approx. 5 V

(3) Continuity between 1 and earth

OK: Continuity

Check the following connectors:
B-78, B-80, A-89, A-98, B-87

Repair

A/T overhaul

Replace the underdrive clutch
retainer.

Check the trouble symptoms.

AUTOMATIC TRANSMISSION –

Troubleshooting <A/T>

23-14

Code No. 23 Output shaft speed sensor system

Probable cause

If the output from the output shaft speed sensor is continuously 50% lower than
the vehicle speed for 1 second or more while driving in 3rd or 4th gear at a speed
of 30 km/h or more, there is judged to be an open circuit or short

circuit in the

output shaft speed sensor and diagnosis code No. 23 is output.
If diagnosis code No. 23 is output four times, the transmission is locked into 3rd
gear (D range) or 2nd gear (downshifting at Sports mode) as a fail

safe measure,

and the N range lamp flashes at a frequency of 1 Hz.

Malfunction of the output shaft speed sensor

Malfunction of the transfer drive gear or driven gear

Malfunction of connector

Malfunction of the engine-A/T-ECU

Eliminate the cause of the noise.

Replace the engine-A/T-ECU.

Check the trouble symptoms.

Check the following harness:

Between the output shaft speed
sensor and the ignition switch

Between the output shaft speed
sensor and engine-A/T-ECU

Repair

Check the trouble symptoms.

Measure output waveform of the output
shaft speed sensor.
(using an oscilloscope)

Engine: 2,000 r/min
(approx. 50 km/h)

Transmission: 3rd gear
(Voltage)
OK: Conforms to the waveform

shown at page 23-38 (Inspec-
tion procedure using an oscil-
loscope). There is no noise
in the output waveform.

Replace the output shaft speed sensor.

Measure at the output shaft speed sen-
sor connector A-97.

Disconnect the connector and
measure at the harness side.

(1) Voltage between 3 and earth

(Ignition switch: ON)
OK: System voltage

(2) Voltage between 2 and earth

(Ignition switch: ON)
OK: approx. 5 V

(3) Continuity between 1 and earth

OK: Continuity

Check the following connectors:
B-78, B-80, A-89, A-97, B-87

Repair

A/T overhaul

Replace the transfer drive gear and
driven gear.

Check the trouble symptoms.

Code No. 25 Wide open throttle switch system

Probable cause

If the wide open throttle switch is on for 1 second or more with the throttle valve
opening angle at 70% or less, it is judged that there is a short circuit in the wide
open throttle switch and diagnosis code No. 25 is output.

Malfunction of the wide open throttle switch

Malfunction of connector

Malfunction of the engine-A/T-ECU

Wide open throttle switch check (Refer to P.23-63).

Replace

Check the following connectors: B-92, B-87

Repair

Harness check

Between the wide open throttle switch and the engine-A/T-ECU.

Repair

Check the trouble symptoms.

Replace the engine-A/T-ECU.

Content .. 109 110 111 112 ..