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Home >> Mitsubishi >> 2000 >> Eclipse GT V6-3.0L SOHC >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> Transmission Control System >> DTC 54

DTC 54









CIRCUIT OPERATION
- A/T control relay (terminal number 1) receives the battery positive voltage from the battery.
- When turning the ignition switch to "ON," the PCM receives battery positive voltage from the ignition switch (terminal 98). Then the PCM (terminal number 50) applies a voltage to the A/T control relay (terminal number 4), and the A/T control relay switch is turned on. When the A/T control relay switch is turned on, the battery applies a battery positive voltage to the PCM (terminal numbers 77 and 89).

DTC SET CONDITIONS
- If the A/T control relay voltage is less than 7 volts after the ignition switch has been turned to "ON," it is judged that there is an open circuit or a short-circuit in the A/T control relay ground and diagnostic trouble code number "54" is output. The transaxle is locked into the 3rd gear as a fail-safe measure. For vehicles with sport mode the "N" range light flashes once per second.

TROUBLESHOOTING HINTS
- The most likely causes for this code to be set:
- Malfunction of the A/T control relay
- Damaged harness, connector
- Malfunction of the PCM

DIAGNOSIS





Required Special Tool: MB991502: Scan Tool (MUT-II)

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

STEP 1. Using Scan Tool MB991502, Check Data List Item 54: A/T Control Relay Output Voltage.
1. Connect scan tool MB991502 to the data link connector.
2. When the ignition switch is turned to "ON," scan tool shows 10 - 12 volts.
3. When the ignition switch is turned to "LOCK" (OFF), the scan tool shows 0 volt.
If the A/T control relay is operating properly, this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.
If the A/T control relay is not operating properly, go to Step 2.

STEP 2. Check The A/T Control Relay.








1. Remove the A/T control relay.
2. Use jumper wires to connect terminal number 2 of the A/T control relay to the negative battery terminal, and terminal number 4 of the A/T control relay to the positive battery terminal.
3. Check the continuity between terminal numbers 1 and 3 of the A/T control relay when the jumper wires are connected to the battery and disconnected from the battery.
If the check above meets the specification, go to Step 3.
If the check above does not meet the specification, replace the A/T control relay. Then confirm that the malfunction is eliminated.

STEP 3. Check The Power Supply Circuit At The A/T Control Relay.





1. Disconnect harness connector A-19X and measure at the harness side.
2. Measure the voltage between terminal 1 and ground. * Voltage should be battery positive voltage.
If battery positive voltage, go to Step 4.
If not battery positive voltage, repair the harness wires or the connectors between the A/T control relay and the battery.

STEP 4. Check The Ground Circuit At The A/T Control Relay.





1. Disconnect harness connector A-19X and measure at the harness side.
2. Check for the continuity between terminal 2 and ground.
- Should be less than 2 Ohm.
If less than 2 ohm, go to Step 5.
If open circuit, repair the harness wires or the connectors between the A/T control relay and the ground.

STEP 5. Check The Circuit At The A/T Control Relay.





1. Disconnect harness connector A-19X and measure at the harness side.
2. Turn the ignition switch to "ON" position.
2. Measure the voltage between terminal 4 and ground.
- Voltage should be 10 - 12 volts.
If 10 - 12 volts, go to Step 6.
If not 10 - 12 volts, repair the harness wires or the connectors between the A/T control relay and the PCM.

STEP 6. Check Connector A-19X At The A/T Control Relay.





If harness connector A-19X is damaged, repair or replace it. Refer to Harness Connector Inspection. Recheck for DTCs.
If harness connector A-19X is in good condition, go to Step 7.

STEP 7. Measure The PCM Terminal Voltage.
Measure the voltage, which is applied to terminal numbers 77 and 89 of PCM connector C-54 <2.4L Engine> or C-55 <3.0L Engine> and terminal number 50 of PCM connector C-57 <2.4L Engine> or C-59 <3.0L Engine> Refer to PCM terminal Voltage Reference Chart for Transaxle Operation.
If the voltage meets the specification, go to Step 8.
If the voltage does not meets the specification, repair the connector or the harness wires between the A/T control relay and the PCM.

STEP 8. Check Harness Connectors C-54 <2.4L Engine> Or C-55 <3.0L Engine> And C-57 <2.4L Engine> Or C-59 <3.0L Engine> At The PCM For Damage.





If harness connectors C-54 <2.4L Engine> or C-55 <3.0L Engine> and C-57 <2.4L Engine> or C-59 <3.0L Engine> are damaged, repair or replace them. Refer to Harness Connector Inspection. Recheck for DTCs.
If harness connectors C-54 <2.4L Engine> or C-55 <3.0L Engine> and C-57 <2.4L Engine> or C-59 <3.0L Engine> are in good condition, replace the PCM. The immobilizer-ECU and the ignition key should be replaced together with it. Refer to Ignition Switch and Immobilizer System -Ignition Switch and Immobilizer System.

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