Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000028C3Q |
Model Year Start: 2023 |
Model: GR Corolla |
Prod Date Range: [11/2022 -
] |
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): B143A87; Lost Communication with Air Inlet Damper Control Servo Motor LIN Missing Message; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 - ] |
DTC
|
B143A87
|
Lost Communication with Air Inlet Damper Control Servo Motor LIN Missing Message
|
DESCRIPTION
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
Memory
|
B143A87
|
Lost Communication with Air Inlet Damper Control Servo Motor LIN Missing Message
|
Diagnosis Condition:
Malfunction:
-
Error or open in communication line between air conditioning amplifier assembly and No. 1 blower damper servo sub-assembly*1
-
Error or open in communication line between air conditioning amplifier assembly and No. 5 air conditioning radiator damper servo sub-assembly*2
Detection Time:
-
Continuously for 10 seconds or more
|
-
Air conditioning harness assembly
-
No. 1 blower damper servo sub-assembly*1
-
No. 5 air conditioning radiator damper servo sub-assembly*2
|
Memorized
|
DTC Detection Condition Combination Table
|
Vehicle Condition
|
Pattern 1
|
Pattern 2
|
Diagnosis Condition
|
Ignition switch ON
|
○
|
○
|
Malfunction
|
-
Error in communication line between air conditioning amplifier assembly and No. 1 blower damper servo sub-assembly*1
-
Error in communication line between air conditioning amplifier assembly and No. 5 air conditioning radiator damper servo sub-assembly*2
|
○
|
-
|
-
Open in communication line between air conditioning amplifier assembly and No. 1 blower damper servo sub-assembly*1
-
Open in communication line between air conditioning amplifier assembly and No. 5 air conditioning radiator damper servo sub-assembly*2
|
-
|
○
|
Detection Time
|
Continuously for 10 seconds or more
|
Continuously for 10 seconds or more
|
Trip Count
|
1 trip
|
1 trip
|
HINT:
If the conditions of either of these patterns are detected, a DTC will be stored.
-
*1: for M20A-FKS
-
*2: for G16E-GTS
WIRING DIAGRAM
for M20A-FKS:
for G16E-GTS:
PROCEDURE
(a) Check for DTCs.
Body Electrical > Air Conditioner > Trouble Codes
Result
|
Proceed to
|
DTC B142A88 is output
|
A
|
DTC B142A88 is not output
|
B
|
B
|
|
|
Result
|
Proceed to
|
for M20A-FKS
|
A
|
for G16E-GTS
|
B
|
A
|
|
|
3.
|
INSPECT AIR CONDITIONING HARNESS ASSEMBLY
|
(a) Disconnect the m4 No. 1 air conditioning radiator damper servo sub-assembly connector.
(b) Disconnect the m1 No. 1 blower damper servo sub-assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
m4-1 (M-) - m1-5 (M-)
|
Always
|
Below 1 Ω
|
m4-2 (M+) - m1-4 (M+)
|
Always
|
Below 1 Ω
|
m4-3 (STE2) - m1-3 (STE2)
|
Always
|
Below 1 Ω
|
m4-4 (STE1) - m1-2 (STE1)
|
Always
|
Below 1 Ω
|
m4-5 (GND) - m1-1 (GND)
|
Always
|
Below 1 Ω
|
m4-1 (M-) or m1-5 (M-) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
m4-2 (M+) or m1-4 (M+) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
m4-3 (STE2) or m1-3 (STE2) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
m4-4 (STE1) or m1-2 (STE1) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
4.
|
INSPECT AIR CONDITIONING HARNESS ASSEMBLY
|
(a) Disconnect the m4 No. 1 air conditioning radiator damper servo sub-assembly connector.
(b) Disconnect the m1 No. 5 air conditioning radiator damper servo sub-assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
m4-1 (M-) - m1-5 (M-)
|
Always
|
Below 1 Ω
|
m4-2 (M+) - m1-4 (M+)
|
Always
|
Below 1 Ω
|
m4-3 (STE2) - m1-3 (STE2)
|
Always
|
Below 1 Ω
|
m4-4 (STE1) - m1-2 (STE1)
|
Always
|
Below 1 Ω
|
m4-5 (GND) - m1-1 (GND)
|
Always
|
Below 1 Ω
|
m4-1 (M-) or m1-5 (M-) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
m4-2 (M+) or m1-4 (M+) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
m4-3 (STE2) or m1-3 (STE2) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
m4-4 (STE1) or m1-2 (STE1) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
|