Code No.C1465, C1466: Rear Differential Lock Air Pump Assembly System


















OPERATION



DIAGNOSIS CODE SET CONDITIONS



  • If the terminal voltage is more than 4 V when the rear differential lock air pump assembly is not driven, or the terminal voltage is less than 6 V when the rear differential lock air pump assembly is driven, code No.C1465 is set.
  • If the current value is more than 3 A when the rear differential lock air pump assembly is driven, code No.C1466 is set.

PROBABLE CAUSES



  • Malfunction of the rear differential lock air pump assembly
  • Damaged harness wires and connectors
  • Malfunction of the transfer-ECU

DIAGNOSIS PROCEDURE

STEP 1. Measure the voltage at rear differential lock air pump assembly connector E-118.
(1)Disconnect the connector, and measure the voltage between terminal No.2 and earth at the wiring harness side.
(2)Turn the ignition switch to the ON position.
OK: 1 V or less

Q. Is the check result normal?
Go to Step 4.
Go to Step 2.

STEP 2. Connector check: E-118 rear differential lock air pump assembly connector, D-221, D-228, E-120 intermediate connector, D-124 transfer-ECU connector.
Check for the contact with terminals.

Q. Is the check result normal?
Go to Step 3.
Repair the defective connector.

STEP 3. Check the harness between rear differential lock air pump assembly connector E-118 terminal No.2 and transfer-ECU connector D-124 terminal No.19.
Check the power supply line for short (for short to the power supply) circuit.

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness.

STEP 4. Connector check: E-118 rear differential lock air pump assembly connector, D-221, D-228, E-120 intermediate connector, D-124 transfer-ECU connector.
Check for the contact with terminals.

Q. Is the check result normal?
Go to Step 5.
Repair the defective connector.

STEP 5. Check the harness between rear differential lock air pump assembly connector E-118 terminal No.2 and transfer-ECU connector D-124 terminal No.19.
Check the power supply line for short (for short to the earth) circuit.

Q. Is the check result normal?
Go to Step 6.
Repair the wiring harness.

STEP 6. Rear differential lock air pump assembly insulation check

Check that no continuity exists between the rear differential lock air pump assembly (case) and each terminal of the E-118 connector (pump side).
OK: 1 MΩ or more

Q. Is the check result normal?

Go to Step 7.

Replace the rear differential lock air pump assembly (Refer to GROUP 27 - Rear Differential Lock ).

STEP 7. Check the rear differential lock air pump assembly.
Refer to GROUP 27 - Rear Differential Lock .

Q. Is the check result normal?
Go to Step 8.
Repair the defective connector.

STEP 8. M.U.T.-III data list.
Item 29: Air pump motor voltage (Refer to .)

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the transfer-ECU.