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Home/Mitsubishi/Galant/Mitsubishi Galant IX (2003-2006)/Repair manual/Ignition Switch/steering Lock/Diagnosis: Overview
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Diagnosis: Overview Mitsubishi Galant IX

Ignition Switch/steering Lock 8 illustrations ~1630 words

GENERAL DESCRIPTION

F4A4B and F4A5A models have been established.

Scheme 14

Scheme 14: GENERAL DESCRIPTION
Scheme 14: GENERAL DESCRIPTION

CIRCUIT OPERATION

  1. The PCM (terminal 74) applies 5 volts to the transmission fluid temperature sensor output terminal (terminal 1).
  2. The transmission fluid temperature sensor circuit is grounded to the PCM (terminal 69).
  3. When the transmission fluid temperature is cold, the transmission fluid temperature sensor resistance is high. When the transmission fluid temperature is hot, the transmission fluid temperature sensor resistance is low.

DESCRIPTIONS OF MONITOR METHODS

  1. If transmission fluid temperature is below specified value even after driving test for more than specified period, PCM judges that transmission fluid temperature sensor has a failure.

Refer to CIRCUIT OPERATION .

  1. If transmission fluid temperature equals or exceeds specified value, PCM judges that transmission fluid temperature sensor has a failure.
  1. The input shaft speed sensor generates 0 <--> 5 volts pulse signal when the input shaft rotates. The pulse signal frequency increases with a rise in input shaft speed.
  2. The input shaft speed sensor is connected to the PCM (terminals 111 and 113) via the input shaft speed sensor connector (terminals 1 and 2).
  3. The PCM detects the input shaft speed by the signal input to terminal 111.
  4. The input shaft speed sensor generates the pulse signal as the teeth of the underdrive clutch retainer pass the magnetic tip of the sensor.
  1. If there is no detection pulse from input shaft speed sensor (turbine rotation) even during driving test at more than specified speed, PCM judges that input shaft speed sensor has a failure.
  1. The output shaft speed sensor generates a 0 <--> 5 volt pulse signal when the output shaft rotates. The pulse signal frequency increases with a rise output shaft speed.
  2. The output shaft speed sensor is connected to the PCM (terminals 112 and 113) via the output shaft speed sensor connector (terminals 1 and 2).
  3. The PCM detects the output shaft speed by the signal input to terminal 112.
  4. The output shaft speed sensor generates the pulse signal as the teeth of the transfer drive gear pass the magnetic tip of the sensor.
  1. < If open circuit occurs during driving test> If abruptly reduced output revolution is detected during driving test, and a difference between turbine revolution and that value calculated from output revolution equals or exceeds specified value, PCM judges that output shaft speed sensor has a failure.
  2. < If open circuit occurs with vehicle stopped, and driving test is started> If there is no detection pulse from output shaft speed sensor (output rotation) even when engine revolution and turbine revolution both equal or exceed specified value, PCM judges that output shaft speed sensor has a failure.
  1. Battery positive voltage is supplied to the stoplight switch (terminal 2).
  2. When the brake pedal is depressed, battery positive voltage is applied to the PCM (terminal 9).
  1. Battery positive voltage is applied to the transmission range switch (terminal 8) when the ignition switch is turned "ON."
  2. Battery positive voltage is applied to the PCM (terminal 67) when the transmission range is in the "P" range. The PCM judges that the transmission range is in the "P" range when the battery positive voltage is applied.
  3. Battery positive voltage is applied to the PCM terminal 61 (77, 73, 62, 75 or 72) when the selector lever is in the "R" range ("N," "D," "3," "2" or "L" range). The PCM judges that the selector lever is in the "R" range ("N," "D," "3," "2" or "L" range) when the battery positive voltage is applied.
  1. If no signal is input from transmission range switch for more than 30 seconds, PCM judges that transmission range switch has a failure.

Refer to DTC 27 (P0705): TRANSMISSION RANGE SWITCH SYSTEM (OPEN CIRCUIT) .

  1. If two types or more of signals are input from transmission range switch for more than 30 seconds, PCM judges that transmission range switch has a failure.

Scheme 15

Scheme 15: LOGIC FLOW CHARTS (Monitor Sequence)
Scheme 15: LOGIC FLOW CHARTS (Monitor Sequence)
  1. The A/T control relay supplies battery positive voltage to the solenoid valve assembly (terminals 9 and 10).
  2. The solenoid valve closes when energized (on), and opens when not energized (off). The PCM energizes the solenoid valve based on input data from sensors such as the Throttle Position Sensor, Transmission Range Switch, Stoplight Switch, Input Shaft Speed Sensor, Output Shaft Speed Sensor, and Transmission Fluid Temperature Sensor.
  3. The PCM provides the ground to energize the solenoid. The amount of time that the circuit is grounded is displayed on scan tool MB991958 in percent.
  4. When the solenoid is energized or de-energized, fluid passes through the valve body and transaxle passages to apply and release components.
  1. If solenoid terminal voltage is below specified value when shift control is not in progress, PCM judges that low-reverse solenoid valve has a failure.

Refer to DTC 31 (P0753): LOW-REVERSE SOLENOID VALVE SYSTEM .

  1. If solenoid terminal voltage is below specified value when shift control is not in progress, PCM judges that underdrive solenoid valve has a failure.

Refer to DTC 31 (P0753): LOW-REVERSE SOLENOID VALVE SYSTEM .

  1. If solenoid terminal voltage is below specified value when shift control is not in progress, PCM judges that second solenoid valve has a failure.

Refer to DTC 31 (P0753): LOW-REVERSE SOLENOID VALVE SYSTEM .

  1. If solenoid terminal voltage is below specified value when shift control is not in progress, PCM judges that overdrive solenoid valve has a failure.

Refer to DTC 31 (P0753): LOW-REVERSE SOLENOID VALVE SYSTEM .

  1. If lock-up is not engaged, and solenoid terminal voltage is below specified value, PCM judges that torque converter clutch solenoid valve has a failure.
  1. The input shaft speed sensor generates a pulsed signal of 0 <--> 5 volts. The pulsed signal frequency increases with an increase in the input shaft speed.
  2. The PCM continuously monitors the input shaft speed signal.

DESCRIPTIONS OF MONITOR METHODS < DTC 41 (P0731)>

  1. In 1st gear, if a difference between turbine revolution and that value calculated from output revolution equals or exceeds specified value, PCM judges that step-out in 1st gear has occurred.
  2. The output shaft speed sensor generates a pulsed signal of 0 <--> 5 volts. The pulsed signal frequency increases with an increase in the output shaft speed.
  3. The PCM continuously monitors the output shaft speed signal.

DESCRIPTIONS OF MONITOR METHODS < DTC 42 (P0732)>

  1. In 2nd gear, if a difference between turbine revolution and that value calculated from output revolution equals or exceeds specified value, PCM judges that step-out in 2nd gear has occurred.

DESCRIPTIONS OF MONITOR METHODS < DTC 43 (P0733)>

  1. In 3rd gear, if a difference between turbine revolution and that value calculated from output revolution equals or exceeds specified value, PCM judges that step-out in 3rd gear has occurred.

DESCRIPTIONS OF MONITOR METHODS < DTC 44 (P0734)>

  1. In 4th gear, if a difference between turbine revolution and that value calculated from output revolution equals or exceeds specified value, PCM judges that step-out in 4th gear has occurred.

DESCRIPTIONS OF MONITOR METHODS < DTC 46 (P0736)>

  1. In reverse gear, if a difference between turbine revolution and that value calculated from output revolution equals or exceeds specified value, PCM judges that step-out in reverse gear has occurred.
  1. At start of lock-up operation, if lock-up clutch cannot be engaged even when duty ratio of torque converter clutch solenoid remains 100% for more than specified time, PCM judges that torque converter clutch is stuck OFF.
  1. With PCM signal for no lock-up engagement, if vehicle speed equals or exceeds specified value, accelerator is ON, and torque converter slip amount is below specified value, PCM judges that torque converter clutch is stuck ON.
  1. A/T control relay (terminal 1) receives the battery positive voltage through a dedicated 20 amp fuse.
  2. When the ignition switch is turned to the "ON" position, the PCM (terminal 82) receives battery voltage from the ignition switch. The PCM (terminal 82) applies voltage to energize the A/T control relay (terminal 3). With the A/T control relay energized, system voltage is applied to the PCM (terminals 70 and 57).
  1. If relay output voltage is below specified value, PCM judges that A/T control relay has a failure.

PCM (terminal number 42) receives battery positive voltage from the battery.

If the select switch of the shift switch assembly is set to the sport mode, battery positive voltage will be applied to the PCM (terminal 39). If the shift switch of the shift switch assembly is set to "UP" or "DOWN" position, battery positive voltage will be applied to the PCM (terminal 32, 36).

  1. The PCM detects the transmission range ("P," "R," "N," "D," sport mode "4," "3," "2," or "1"), and display it on the combination meter.

PCM TERMINAL VOLTAGE REFERENCE CHART FOR TRANSAXLE OPERATION

  1. Disconnect the PCM connectors, and connect special tool MB991923 in between.
  2. Measure the voltages between each check connector terminals of special tool MB991923 and ground terminals 4 or 7.

Scheme 16

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Scheme 19

Scheme 19: PCM TERMINAL RESISTANCE AND CONTINUITY INSPECTION CHART
Scheme 19: PCM TERMINAL RESISTANCE AND CONTINUITY INSPECTION CHART

Note. The PCM connectors should be disconnected for this inspection.

Scheme 20

Scheme 20: INSPECTION PROCEDURE USING AN OSCILLOSCOPE
Scheme 20: INSPECTION PROCEDURE USING AN OSCILLOSCOPE

Scheme 21

Scheme 21: Waveform sample
Scheme 21: Waveform sample

INTRODUCTION TO A/T KEY INTERLOCK AND SHIFT LOCK MECHANISMS

If the key interlock and shift lock mechanisms indicates a malfunction, the key interlock cable, the shift lock cable, or the selector lever assembly may be defective. In this case, follow troubleshooting below.

TECHNICAL DESCRIPTION (COMMENT)

Lock cam or shift lock cable may be defective.

Selector lever assembly, shift lock cable, key interlock cable, transaxle control cable, or lock cam may be defective.

Key interlock cable or lock cam may be defective.

Key interlock cable, shift lock cable, transaxle control cable, lock cam, or selector lever assembly may be defective.

Selector lever assembly, transaxle control cable, or lock cam may be defective.

Lock cam, steering lock cylinder assembly, transaxle control cable, or key interlock cable may be defective.

Lock cam, steering lock cylinder assembly, transaxle control cable, or key interlock cable may be defective.

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