Code No.P0882:
Power supply system
PROBABLE CAUSES
OPERATION
The A/T-ECU is energised via the A/T control relay 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 9 V or less (1 drive cycle), code No.P0882 is set.
PROBABLE CAUSES
- Malfunction of A/T control relay
- Damaged harness wires and connectors
- Malfunction of the A/T-ECU
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STEP 1. Check the A/T control relay
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Refer to  .
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Q.
Is the check result normal?
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 Go to Step 2.
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 Replace the A/T control relay.
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STEP 2. Measure the voltage at A/T control relay connector.
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Disconnect the connector, and measure the voltage between terminal No.4 and earth at the
harness side.
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 3.
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STEP 3. Check for open circuit, short circuit and harness damage in
relay switch side power supply line between A/T control relay connector and battery.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the connector(s) or the wiring harness.
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STEP 4. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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Q.
Is diagnosis code No.P0882 set?
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Replace the A/T-ECU.
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction).
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STEP 5. Measure the voltage at the A/T control relay connector.
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(1)Disconnect the connector, and measure the voltage between terminal No.1 and earth
at the harness side.
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(2)Turn the ignition switch to the ON position.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 7.
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Go to Step 6.
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STEP 6. Check for open circuit, short circuit and harness damage in
relay coil side power supply line between A/T control relay connector and J/B
connector.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the connector(s) or the wiring harness.
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STEP 7. Measure the resistance at A/T control relay connector.
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Disconnect the connector, and measure the resistance between terminal No.2 and earth at
the harness side.
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Q.
Is the check result normal?
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Go to Step 9.
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Go to Step 8.
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STEP 8. Check for open circuit and harness damage in relay coil side
earth line between A/T control relay connector and earth.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the connector(s) or the wiring harness.
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STEP 9. Measure the resistance at A/T-ECU connector.
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Disconnect the connector, and measure the resistance between terminal GRP1, GRP2 line
and earth at the harness side.
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Q.
Is the check result normal?
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Go to Step 11.
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Go to Step 10.
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STEP 10. Check for open circuit and harness damage in GRP1, GRP2 line
between A/T-ECU connector and earth.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the connector(s) or the wiring harness.
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STEP 11. Measure the voltage at the A/T-ECU connector.
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(1)Measure the voltage between terminal No.1 and earth at the ECU side.
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(2)Turn the ignition switch to the ON position.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 4.
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Go to Step 12.
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STEP 12. Check for open circuit, short circuit and harness damage
in between A/T control relay connector and A/T-ECU connector.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the connector(s) or the wiring harness.
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