Code No.P0882: Power Supply System (Open Circuit)


OPERATION


The A/T-ECU is energised from the battery.

DIAGNOSIS CODE SET CONDITION


While the engine is running, if a status continues for 20 seconds with which the power supply voltage to A/T-ECU is standard value or less, code No.P0882 is set.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. Battery check
Perform the battery test (Refer to GROUP 54A - Battery - Battery Test ). Check the battery terminals for looseness or contamination.

Q. Is the check result normal?
Go to Step 2.
Repair the battery terminals or replace the battery.

STEP 2. Alternator check
Refer to GROUP 16 - Charging System - Alternator Output Line Voltage Drop Test .

Q. Is the check result normal?
Go to Step 3.
Replace the alternator.

STEP 3. Measure the voltage at the A/T-ECU connector.
Disconnect the connector, and measure the voltage between terminal BAT and body earth at the harness side.
OK: Battery voltage

Q. Is the check result normal?
Go to Step 5.
Go to Step 4.

STEP 4. Check for open circuit, short circuit and harness damage in power supply line between A/T-ECU connector and battery.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Repair the connector(s) or the wiring harness.

STEP 5. Measure the voltage at the A/T-ECU connector.
(1)Disconnect the connector, and measure the voltage between terminal IGSW and body earth at the harness side.
(2)Turn the ignition switch to the "ON" position.
OK: System voltage

Q. Is the check result normal?
Go to Step 7.
Go to Step 6.

STEP 6. Check for open circuit, short circuit and harness damage in power supply line between A/T-ECU connector and J/B connector.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Repair the connector(s) or the wiring harness.

STEP 7. Measure the resistance at A/T-ECU connector.
Disconnect the connector, and measure the resistance between terminal GRP1 line and body earth at the harness side.
OK: 2 Ω or less

Q. Is the check result normal?
Go to Step 8.
Repair the connector(s) or the wiring harness.

STEP 8. Check whether the diagnosis code is set again.

  • Ignition switch: "LOCK"(OFF) → "ON"
  • Check again if the diagnosis code is set.

Q. Is diagnosis code No.P0882 set?
Replace the A/T-ECU.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).