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Code No.54: A/T Control Relay System |
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OPERATION
If a fail-safe operation is activated, the A/T control relay shuts off the power supply to the solenoid valve in accordance with the signal from the engine-A/T-ECU.
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DIAGNOSIS CODE SET CONDITIONS
Code No.54 will be set if the A/T control voltage is less than 7 V after the ignition switch is turned on.
If code No.54 is set, the transmission will be held in 3rd gear.
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PROBABLE CAUSES
- Malfunction of A/T control relay
- Damaged harness wires and connectors
- Malfunction of the engine-A/T-ECU
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STEP 1. MUT-II/III data list
Item 54: Relay voltage (Refer to data list reference table  ).
Q: Is the check result normal?
YES:
Intermittent malfunction (Refer to GROUP 00 -
How to Cope with Intermittent Malfunction ).
NO:
Go to Step 2  .
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STEP 2. Check the A/T control relay connector
Refer to .
Q: Is the check result normal?
YES:
Go to Step 3 .
NO:
Replace the A/T control relay.
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STEP 3. Connector check: B-16X A/T control relay connector
Check for the contact with terminals.
Q: Is the check result normal?
YES:
Go to Step 4 .
NO:
Repair the defective connector.
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STEP 4. Measure the voltage at A/T control relay connector B-16X.
Disconnect the A/T control relay, and measure the voltage between terminal No.4 and earth at the relay box side.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 8 .
NO:
Go to Step 5 .
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STEP 5. Connector check: A-14 intermediate connector
Check for the contact with terminals.
Q: Is the check result normal?
YES:
Go to Step 6 .
NO:
Repair the defective connector.
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STEP 6. Check the harness between A/T control relay connector B-16X terminal No.4 and battery.
Check the power supply line for short or open circuit.
Q: Is the check result normal?
YES:
Go to Step 7 .
NO:
Repair the wiring harness.
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STEP 7. MUT-II/III data list
Item 54: Relay voltage (Refer to data list reference table ).
Q: Is the check result normal?
YES:
The trouble can be an intermittent malfunction (Refer to GROUP 00 -
How to Cope with Intermittent Malfunction ).
NO:
Replace the engine-A/T-ECU.
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STEP 8. Measure the voltage at the A/T control relay connector B-16X. - Turn the ignition switch to the ON position.
- Disconnect the A/T control relay, and measure the voltage between terminal No.3 and earth at the relay box side.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 11 .
NO:
Go to Step 9 .
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STEP 9. Connectors check: C-16 J/C(1), C-106 intermediate connector, C-202 J/B connector
Check for the contact with terminals.
Q: Is the check result normal?
YES:
Go to Step 10 .
NO:
Repair the defective connector.
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STEP 10. Check the wiring harness between A/T control relay connector B-16X terminal No.3 and junction block connector C-202 terminal No.12.
Check the power supply line for short or open circuit.
Q: Is the check result normal?
YES:
Go to Step 7 .
NO:
Repair the wiring harness.
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STEP 11. Measure the voltage at engine-A/T-ECU connector C-138. - Install the A/T control relay.
- Turn the ignition switch to the ON position.
- Measure the voltage between engine-A/T-ECU connector C-138 terminal No.123, No.124 and earth.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 14 .
NO:
Go to Step 12 .
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STEP 12. Connector check: C-138 engine-A/T-ECU connector
Check for the contact with terminals.
Q: Is the check result normal?
YES:
Go to Step 13 .
NO:
Repair the defective connector.
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STEP 13. Check the harness between A/T control relay connector B-16X terminal No.1 and engine-A/T-ECU connector C-138 terminal No.123, No.124.
Check the power supply line for short or open circuit.
Q: Is the check result normal?
YES:
Go to Step 7 .
NO:
Repair the wiring harness.
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STEP 14. Connector check: C-138 engine-A/T-ECU connector
Check for the contact with terminals.
Q: Is the check result normal?
YES:
Go to Step 15 .
NO:
Repair the defective connector.
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STEP 15. Check the harness between A/T control relay connector B-16X terminal No.2 and engine-A/T-ECU connector C-138 terminal No.127.
Check the output line for short or open circuit.
Q: Is the check result normal?
YES:
Go to Step 7 .
NO:
Repair the wiring harness.
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