COMBUSTION TYPE POWER HEATER SYSTEM Power Heater Switch Circuit
| DTC Code | DTC Name |
|---|---|
| Power Heater Switch Circuit |
DESCRIPTION
When the heater switch assembly is turned on, the heater assembly sends a drive signal to the heater pump assembly. The heater assembly then receives the fuel necessary for combustion and starts operating.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
CONFIRM MODEL
Result
Result
Proceed to
for Sedan
A
for Hatchback, Wagon
B
B CHECK HARNESS AND CONNECTOR (HEATER ASSEMBLY - IG POWER SOURCE, BODY GROUND)Click here
CHECK HARNESS AND CONNECTOR (HEATER ASSEMBLY - IG POWER SOURCE, BODY GROUND)
Disconnect the E97 heater switch assembly connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection
Condition
Specified Condition
E97-4 (IG) - Body ground
Ignition switch ON
11 to 14 V
E97-4 (IG) - Body ground
Ignition switch off
Below 1 V
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
E97-5 (E) - Body ground
Always
Below 1 Ω
Result
Proceed to
OK
NG
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
INSPECT HEATER SWITCH ASSEMBLY
-
*a
Component without harness connected
(Heater Switch Assembly)
Measure the resistance.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
4 (IG) - 1 (IN)
Heater switch assembly: On
Below 1 Ω
4 (IG) - 1 (IN)
Heater switch assembly: Off
10 kΩ or higher
Check the operation indicator.
Turn the heater switch assembly on.
Connect a positive (+) lead from the battery to terminal 4 (IG) and a negative (-) lead to terminal 5 (E), and check that the operation indicator comes on.
OK
Indicator comes on.
Result
Proceed to
OK
NG
-
CHECK HARNESS AND CONNECTOR (HEATER SWITCH ASSEMBLY - HEATER ASSEMBLY, ECM, ENGINE STOP AND START ECU)
Disconnect the A42 heater assembly connector.
Disconnect the E24 engine stop and start ECU connector.*1
Disconnect the A101*3 or A169*4 ECM connector.*2
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
E97-1 (IN) - A42-3 (IG)
Always
Below 1 Ω
E97-1 (IN) - E24-4 (CHI)*1
Always
Below 1 Ω
E97-1 (IN) - A101-26 (MHSW)*2, *3
Always
Below 1 Ω
E97-1 (IN) - A169-32 (MHSW)*2, *4
Always
Below 1 Ω
A42-3 (IG) - Body ground
Always
10 kΩ or higher
E24-4 (CHI) - Body ground*1
Always
10 kΩ or higher
A101-26 (MHSW) - Body ground*2, *3
Always
10 kΩ or higher
A169-32 (MHSW) - Body ground*2, *4
Always
10 kΩ or higher
*1: w/ Stop and Start System
*2: for 1ND-TV
*3: w/o Glow Plug Controller
*4: w/ Glow Plug Controller
Result
Result
Proceed to
OK (Resistance between heater assembly and heater switch assembly is normal)
A
OK (Resistance between heater assembly and ECM is normal)
B
OK (Resistance between heater assembly and engine stop and start ECU is normal)
C
NG
D
D REPAIR OR REPLACE HARNESS OR CONNECTOR
CHECK HARNESS AND CONNECTOR (HEATER ASSEMBLY - IG POWER SOURCE, BODY GROUND)
Disconnect the E135 heater switch assembly connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection
Condition
Specified Condition
E135-8 (IG) - Body ground
Ignition switch ON
11 to 14 V
E135-8 (IG) - Body ground
Ignition switch off
Below 1 V
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
E135-3 (E) - Body ground
Always
Below 1 Ω
Result
Proceed to
OK
NG
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
INSPECT HEATER SWITCH ASSEMBLY
-
*a
Component without harness connected
(Heater Switch Assembly)
Measure the resistance.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
8 (IG) - 5 (IN)
Heater switch assembly: On
Below 1 Ω
8 (IG) - 5 (IN)
Heater switch assembly: Off
10 kΩ or higher
Check the operation indicator.
Turn the heater switch assembly on.
Connect a positive (+) lead from the battery to terminal 8 (IG) and a negative (-) lead to terminal 3 (E), and check that the operation indicator comes on.
OK
Indicator comes on.
Result
Proceed to
OK
NG
-
CHECK HARNESS AND CONNECTOR (HEATER SWITCH ASSEMBLY - HEATER ASSEMBLY, ECM, ENGINE STOP AND START ECU)
Disconnect the A42 heater assembly connector.
Disconnect the E24 engine stop and start ECU connector.*1
Disconnect the A169 ECM connector.*2
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
E135-5 (IN) - A42-3 (IG)
Always
Below 1 Ω
E135-5 (IN) - E24-4 (CHI)*1
Always
Below 1 Ω
E135-5 (IN) - A169-32 (MHSW)*2
Always
Below 1 Ω
A42-3 (IG) - Body ground
Always
10 kΩ or higher
E24-4 (CHI) - Body ground*1
Always
10 kΩ or higher
A169-32 (MHSW) - Body ground*2
Always
10 kΩ or higher
*1: w/ Stop and Start System
*2: for 1ND-TV
Result
Result
Proceed to
OK (Resistance between heater assembly and heater switch assembly is normal)
A
OK (Resistance between heater assembly and ECM is normal)
B
OK (Resistance between heater assembly and engine stop and start ECU is normal)
C
NG
D
D REPAIR OR REPLACE HARNESS OR CONNECTOR