Inspection Procedure
19: The PTC heater (Passenger’s side) does not work
<3200>
|
|
COMMENTS ON TROUBLE SYMPTOM
|
|
|
When the PTC heater does not work under the
following conditions, the PTC heater circuit
system may be defective.
|
|
|
PTC heater operating conditions
- Air outlet: FOOT/DEF, FOOT, FACE/FOOT
- Temperature control dial: MAX HOT
- Coolant temperature: 82 degrees Celsius or less
|
|
|
| note |
When the coolant temperature becomes above 82
degrees Celsius and PTC heater stops the
operation, the PTC heater does not operate until coolant temperature
becomes below 72 degrees
Celsius.
|
|
|
|
- Damaged the wiring harness or connectors
- Malfunction of the PTC heater relay 2
- Malfunction of the PTC heater 2
- Malfunction of the automatic A/C control panel
(A/C-ECU)
|
|
|
STEP 1. Connector check: D-109 PTC heater 2 connector
|
|
|
Q.
Is the check result normal?
|
|
|
 Go to Step 2.
|
|
|
|
|
|
 Repair
the connector.
|
|
|
|
|
|
STEP 2. Resistance measurement at the D-109 PTC heater
connector.
|
|
|
(1)Disconnect the connector, and measure at the wiring
harness side.
|
|
|
(2)Continuity between terminal 1 and body
earth
OK: Continuity (Less than 2 Ω)
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 4.
|
|
|
|
|
|
Go to Step 3.
|
|
|
|
|
|
STEP 3. Check the wiring harness between D-109 PTC heater 2 connector
terminal No.1 and body earth.
|
|
|
- Check the PTC heater 2 earth line for open circuit.
|
|
|
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 wiring harness.
|
|
|
|
|
|
STEP 4. Connector check: D-213 engine-ECU connector
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 5.
|
|
|
|
|
|
Repair
the connector.
|
|
|
|
|
|
STEP 5. Voltage measurement at D-109 PTC heater
connector.
|
|
|
(1)Disconnect the connector, and measure at the wiring
harness side.
|
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
|
(3)Disconnect engine-ECU connector D-213 and earth terminal
41.
|
|
|
(4)Voltage between terminal 2 and body
earth.
OK: System voltage
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 14.
|
|
|
|
|
|
Go to Step 6.
|
|
|
|
|
|
STEP 6. Connector check: A-45 PTC heater relay 2
connector
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 7.
|
|
|
|
|
|
Repair
the connector.
|
|
|
|
|
|
STEP 7. Check the PTC heater relay 2 continuity.
|
|
|
Refer to .
|
|
|
Q.
Is the PTC heater switch relay 1 in good condition?
|
|
|
Go to Step 8.
|
|
|
|
|
|
Replace the PTC heater relay
2.
|
|
|
|
|
|
STEP 8. Voltage measurement at A-45 PTC heater relay 2
connector.
|
|
|
(1)Remove the relay, and measure at the relay block
side.
|
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
|
(3)Voltage between terminal 1 and body
earth.
OK: System voltage
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 10.
|
|
|
|
|
|
Go to Step 9.
|
|
|
|
|
|
STEP 9. Check the wiring harness between A-45 PTC heater relay 2
connector
terminal No.1 and the ignition switch (IG2).
|
|
|
| note |
Prior to the wiring harness inspection, check
junction block connectors D-403, D-401,
PTC heater relay 1 A-46, joint connector A-15 and intermediate connector
D-241, and repair if necessary.
|
|
|
|
- Check the PTC heater relay 2 earth supply line for open
circuit.
|
|
|
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 wiring harness.
|
|
|
|
|
|
STEP 10. Voltage measurement at A-45 PTC heater relay 2
connector.
|
|
|
(1)Remove the relay, and measure at the relay block
side.
|
|
|
(2)Voltage between terminal 5 and body
earth.
OK: System voltage
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 12.
|
|
|
|
|
|
Go to Step 11.
|
|
|
|
|
|
STEP 11. Check the wiring harness between A-45 PTC heater relay 2
connector terminal No.5 and the fusible link (30).
|
|
|
- Check the PTC heater relay 2 power supply line for open
circuit.
|
|
|
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 wiring harness.
|
|
|
|
|
|
STEP 12. Check the wiring harness between A-45 PTC heater relay 2
connector terminal No.3 and D-213 engine-ECU connector terminal
No.41.
|
|
|
| note |
Prior to the wiring harness inspection, check
intermediate connector A-03 and PTC heater
relay 1 A-46, and repair if necessary.
|
|
|
|
- Check the PTC heater relay 2 earth line for open or short
circuit.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 13.
|
|
|
|
|
|
Repair
the wiring harness.
|
|
|
|
|
|
STEP 13. Check the wiring harness between A-45 PTC heater relay 2
connector terminal No.2 and D-109 PTC heater 2 connector terminal
No.2.
|
|
|
- Check the PTC heater relay 2 power supply line for open
circuit.
|
|
|
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 wiring harness.
|
|
|
|
|
|
STEP 14. Check the wiring harness between D-08 A/C-ECU connector
terminal
No.14 and D-213 engine-ECU connector terminal No.35.
|
|
|
- Check the engine-ECU input line for open circuit.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 15.
|
|
|
|
|
|
Repair
the wiring harness.
|
|
|
|
|
|
STEP 15. Replace the A/C-ECU and recheck the trouble
symptom
|
|
|
Check that the front blower motor operates
normally.
|
|
|
Q.
Is the check result normal?
|
|
|
This
diagnosis is complete.
|
|
|
|
|
|
Replace the engine-ECU.
|
|
|
|