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With the engine and blower motor being operated, if the PTC heater does not operate by
setting the heater control to MAX HOT at the coolant temperature of 75 °C or lower,
the PTC heater, PTC heater relay, engine-ECU or its circuit system may be faulty.
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- Failed PTC heater
- Failed PTC heater relay A
- Failed PTC heater relay B
- Failed PTC heater relay C
- Open/short circuit or harness damage in PTC heater relay circuit or loose connector
contact
- Failed engine-ECU
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- Refer to Data List Reference Table
.
- Item 76: PTC heater relay 1
- Item 77: PTC heater relay 2
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Q.
Is the check result normal?
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- Disconnect connector, and measure at the harness side.
- Ignition switch: ON
- Voltage between terminal HTR1, HTR2, HTR3 and body earth.
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Q.
Is the check result normal?
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Repair or replace the connector, or check and repair harness between engine-ECU
connector terminal HTR1, HTR2, HTR3 and PTC heater relay A, PTC heater relay B, PTC heater relay
C connector terminal, ignition switch (IG2) connector terminal, IG2 relay connector terminal.
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- PTC heater relay connector check.
- Check PTC heater relay (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - Relay Check).
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Q.
Is the check result normal?
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Repair or replace the connector, or replace the PTC heater relay.
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- Disconnect connector, and measure at the harness side.
- Using a jumper wire, connect engine-ECU connector terminal HTR1, HTR2, HTR3 and
body earth.
- Ignition switch: ON
- Voltage between PTC heater connector power supply line terminal 1, 2, 3 and body
earth.
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Q.
Is the check result normal?
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- Check output line for open/short circuit.
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Q.
Is the check result normal?
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Repair or replace the connector, or repair the damaged harness wire.
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- Check power supply line for damage.
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Q.
Is the check result normal?
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Repair or replace the connector, or repair the damaged harness wire.
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Check that the PTC heater works normally.
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Q.
Is the check result normal?
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This diagnosis is complete.
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Replace the PTC heater. Then go to Step 8.
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Check that the PTC heater works normally.
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Q.
Is the check result normal?
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This diagnosis is complete.
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