Code No.C1610:
AWC Power Supply Electronic Relay Malfunction
OPERATION
A relay is incorporated in AWC-ECU, and the power is supplied to the actuator via this
relay.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the actuator power supply voltage is less than 6 V while
the actuator power supply relay in the AWC-ECU is ON.
PROBABLE CAUSES
- Malfunction of AWC-ECU
- Malfunction of electronic control coupling solenoid (Centre)
- Malfunction of electronic control coupling solenoid (Front)
- Damaged harness wires and connectors
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STEP 1. Measure the resistance at the AWC-ECU connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Resistance between AWC-ECU connector terminal FSL+, FSL- and body earth.
OK: No continuity
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Q.
Is the check result normal?
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 Go to Step 3.
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 Go to Step 2.
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STEP 2. Check the wiring harness between electronic control coupling
solenoid (front) connector and AWC-ECU connector terminal FSL+, FSL-.
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Check the power supply, earth line for short circuit (for short to the power supply).
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Q.
Is the check result normal?
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Go to Step 3.
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Repair the defective connector or the wiring harness. Then go to Step 7.
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STEP 3. Check of the electronic control coupling solenoid (front)
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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 transfer assembly (Refer to ). Then
go to Step 7.
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STEP 4. Measure the resistance at the AWC-ECU connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Resistance between AWC-ECU connector terminal SOL+, SOL- and body earth.
OK: No continuity
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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 5.
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STEP 5. Check the wiring harness between electronic control coupling
solenoid (centre) connector and AWC-ECU connector terminal SOL+, SOL-.
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Check the power supply, earth line for short circuit (for short to the power supply).
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Q.
Is the check result normal?
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Go to Step 6.
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Repair the defective connector or the wiring harness. Then go to Step 7.
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STEP 6. Check of the electronic control coupling solenoid (centre)
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Refer to GROUP 27C -
On-vehicle Service.
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Q.
Is the check result normal?
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Go to Step 7.
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Replace the electronic control coupling (centre) (Refer to GROUP 27C -
Electronic
control coupling). Then go to Step 7.
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STEP 7. Check whether the diagnosis code is set again.
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Q.
Is diagnosis code No.C1610 set?
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Replace the AWC-ECU (Refer to ). Then go to
Step 8.
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Intermittent malfunction (Refer to GROUP 00 -
How to Cope with Intermittent
Malfunction).
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STEP 8. Check whether the diagnosis code is set again.
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Q.
Is diagnosis code No.C1610 set?
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Return to Step 1.
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This diagnosis is complete.
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