Code No.P0812: Reverse Input Circuit
PROBABLE CAUSES
- Malfunction of the inhibitor switch
- Malfunction of the rear combination lamp (back-up lamp bulb)
- Damaged harness wires and connectors
- Malfunction of the A/T-ECU
OPERATION
The inhibitor switch detects the selector lever position R which the driver has selected, and sends the information to the A/T-ECU.
DIAGNOSIS CODE SET CONDITIONS
- When the selector lever position is R, If a status continues for 5 seconds with which the A/T-ECU terminal monitor voltage is 0 V, code No.P0812 is set.
- When the selector lever position is D, If a status continues for 5 seconds with which the A/T-ECU terminal monitor voltage is 12 V, code No.P0812 is set.
PROBABLE CAUSES
- Malfunction of the inhibitor switch
- Malfunction of the rear combination lamp (back-up lamp bulb)
- Damaged harness wires and connectors
- Malfunction of the A/T-ECU
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STEP 1. Measure the voltage at inhibitor switch connector.
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(1)Disconnect the connector, and measure the voltage between terminal power supply line and body earth at the wiring harness side.
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(2)Turn the ignition switch to the "ON" position.
OK: Battery voltage
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Q.
Is the check result normal?
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 Go to Step 2.
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 Check for open circuit and short circuit in power supply line between inhibitor switch connector and J/B connector. Then repair the connector(s) or the wiring harness.
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STEP 2. Measure the voltage at A/T-ECU connector.
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(1)Disconnect the connector, and measure the voltage between terminal INHR line and body earth at the wiring harness side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Selector lever position: "R"
OK: System voltage
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(4)Selector lever position: "D"
OK: 1 V or less
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 3.
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STEP 3. Check the inhibitor switch.
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Refer to  .
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Q.
Is the check result normal?
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Go to Step 4.
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Replace the inhibitor switch.
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STEP 4. Measure the voltage at A/T-ECU connector.
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(1)Disconnect the rear combination lamp (L/RH).
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(2)Disconnect the connector, and measure the voltage between terminal INHR line and body earth at the wiring harness side.
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(3)Turn the ignition switch to the "ON" position.
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(4)Selector lever position: "R"
OK: System voltage
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(5)Selector lever position: "D"
OK: 1 V or less
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Q.
Is the check result normal?
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Replace the rear combination lamp LH or RH.
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Go to Step 5.
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STEP 5. Check for open circuit and short circuit in INHR line between rear combination lamp (LH/RH), inhibitor switch connector and A/T-ECU connector.
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Q.
Is the check result normal?
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Go to Step 6.
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Repair the connector(s) or the wiring harness.
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STEP 6. Check whether the diagnosis code is set again.
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- Ignition switch: "LOCK"(OFF) → "ON"
- Check again if the diagnosis code is set.
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Q.
Is diagnosis code No.P0812 set?
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Replace the A/T-ECU.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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