DESCRIPTION
PTC HTR heater relays are closed in accordance with signals from the air conditioning amplifier assembly and power is supplied to the quick heater assembly installed on the radiator heater unit.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
1. |
PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.
(e) Check the operation by referring to the table below.
Air Conditioner
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
---|---|---|---|
Heater Active Level |
Quick heater assembly |
Min.: 0, Max.: 3 |
- |
OK:
Heater Active Level changes normally.
NG |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
2. |
INSPECT PTC HTR RELAY |
(a) Remove the PTC HTR relays.
(b) Inspect the PTC HTR relays (See page ).
NG |
REPLACE PTC HTR RELAY |
|
3. |
CHECK HARNESS AND CONNECTOR (PTC HTR RELAY - POWER SOURCE CIRCUIT) |
(a) Remove the PTC HTR relays.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
PTC HTR NO. 1
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 1-1 - Body ground |
Always |
11 to 14 V |
PTC HTR NO. 1-5 - Body ground |
Always |
11 to 14 V |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 2-1 - Body ground |
Always |
11 to 14 V |
PTC HTR NO. 2-5 - Body ground |
Always |
11 to 14 V |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 3-1 - Body ground |
Always |
11 to 14 V |
PTC HTR NO. 3-5 - Body ground |
Always |
11 to 14 V |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK HARNESS AND CONNECTOR (PTC HTR RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
(a) Remove the PTC HTR relays.
(b) Disconnect the A36 air conditioning amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
PTC HTR NO. 1
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 1-2 - A36-19 (PTC1) |
Always |
Below 1 Ω |
PTC HTR NO. 1-2 or A36-19 (PTC1) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 2-2 - A36-20 (PTC2) |
Always |
Below 1 Ω |
PTC HTR NO. 2-2 or A36-20 (PTC2) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 3-2 - A36-21 (PTC3) |
Always |
Below 1 Ω |
PTC HTR NO. 3-2 or A36-21 (PTC3) - Body ground |
Always |
10 kΩ or higher |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
CHECK HARNESS AND CONNECTOR (QUICK HEATER ASSEMBLY - PTC HTR RELAY AND BODY GROUND) |
(a) Remove the PTC HTR relays.
(b) Disconnect the Q1 quick heater assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
PTC HTR NO. 1
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 1-3 - Q1-3 (B) |
Always |
Below 1 Ω |
Q1-2 (E) - Body ground |
Always |
Below 1 Ω |
Q1-4 (E) - Body ground |
Always |
Below 1 Ω |
PTC HTR NO. 1-3 or Q1-3 (B) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 2-3 - Q1-1 (B) |
Always |
Below 1 Ω |
Q1-2 (E) - Body ground |
Always |
Below 1 Ω |
PTC HTR NO. 2-3 or Q1-1 (B) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 3-3 - Q1-5 (B) |
Always |
Below 1 Ω |
Q1-4 (E) - Body ground |
Always |
Below 1 Ω |
PTC HTR NO. 3-3 or Q1-5 (B) - Body ground |
Always |
10 kΩ or higher |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
INSPECT QUICK HEATER ASSEMBLY |
(a) Remove the quick heater assembly (See page ).
(b) Inspect the quick heater assembly (See page ).
OK |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
NG |
REPLACE QUICK HEATER ASSEMBLY |
System Description
SYSTEM DESCRIPTION
1. SYSTEM FUNCTION
Function
Outline
Push-button start function
When the key is brought into the vehicle and verified, this function
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Removal
REMOVAL
PROCEDURE
1. REMOVE FRONT CONSOLE BOX
(See page )
2. DISCONNECT TRANSMISSION CONTROL CABLE ASSEMBLY
3. REMOVE TRANSMISSION CONTROL CABLE ASSEMBLY
(a) Remove the nut and clip and disconnect the transmission control cable
assembly from the automatic transmission assem ...
Engine Coolant Temperature Sensor
Components
COMPONENTS
ILLUSTRATION
Inspection
INSPECTION
PROCEDURE
1. INSPECT ENGINE COOLANT TEMPERATURE SENSOR
(a) Partially immerse the engine coolant temperature sensor in water and warm
up the water.
(b) Measure the resistance according to the value(s) in the table bel ...