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Code No.56: N Range Lamp System |
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OPERATION
If a fail-safe operation is activated during driving, the engine-A/T-ECU flashes the N range lamp at a frequency of 1 Hz to inform the driver.
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DIAGNOSIS CODE SET CONDITIONS
If the N range signal is OFF after the N range lamp illuminates (ON), it is judged that there is a short-circuit to earth or open circuit in the N range lamp, and code No.56 is output.
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PROBABLE CAUSES
- Malfunction of the combination meter
- Damaged harness wires and connectors
- Malfunction of the engine-A/T-ECU
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STEP 1. MUT-II/III data list
Item 61: Inhibitor switch (Refer to data list reference table  ).
Q: Is the check result normal?
YES:
Go to Step 2  .
NO:
Refer to inspection procedure 16: Inhibitor switch system .
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STEP 2. Check the N range lamp. - Turn the ignition switch to the ON position.
- Shift the selector lever to the N position.
Q: Does the N range lamp illuminate?
YES:
Go to Step 10 .
NO:
Go to Step 3 .
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STEP 3. Check the N range lamp valve. - Remove the combination meter (Refer to GROUP 54A -
Combination Meter Assembly and Vehicle Speed Sensor Removal and Installation ).
- Check the N range lamp valve.
Q: Is the check result normal?
YES:
Go to Step 4 .
NO:
Replace the valve.
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STEP 4. Connector check: C-05 combination meter connector
Check for the contact with terminals.
Q: Is the check result normal?
YES:
Go to Step 5 .
NO:
Repair the defective connector.
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STEP 5. Measure the resistance at combination meter connector C-05.
Disconnect the connector, and measure the resistance between terminal 12 and earth at the wiring harness side.
OK: 2 Ω
or less
Q: Is the check result normal?
YES:
Go to Step 7 .
NO:
Go to Step 6 .
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STEP 6. Check the harness between combination meter connector C-05 terminal No.12 and body earth.
Check the earth line for open circuit or short-circuit.
Q: Is the check result normal?
YES:
Go to Step 10 .
NO:
Repair the wiring harness.
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STEP 7. Measure the voltage at combination meter connector C-05. - Disconnect the connector, and measure the voltage between terminal 2 and earth at the wiring harness side.
- Turn the ignition switch to the ON position.
- Shift the selector lever to the N position.
OK: System voltage
Q: Is the check result normal?
YES:
Check the combination meter, and replace if necessary.
NO:
Go to Step 8 .
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STEP 8. Connector check: C-105 intermediate connector
Check for the contact with terminals.
Q: Is the check result normal?
YES:
Go to Step 9 .
NO:
Repair the defective connector.
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STEP 9. Check the harness between combination meter connector C-05 terminal No.2 and inhibitor switch connector B-22 terminal No.4.
Check the output line for short-circuited or open circuit.
Q: Is the check result normal?
YES:
Go to Step 10 .
NO:
Repair the wiring harness.
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STEP 10. Connector check: C-109 engine A/T-ECU connector
Check for the contact with terminals.
Q: Is the check result normal?
YES:
Replace the engine-A/T-ECU.
NO:
Repair the defective connector.
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