Toyota Corolla Cross: Lost Communication with Alternator Missing Message (P161A87)
DESCRIPTION
The ECM communicates with the generator assembly via LIN communication. If a LIN communication error is detected, the ECM stores this DTC.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Warning Indicate |
Note |
|---|---|---|---|---|---|---|
|
P161A87 |
Lost Communication with Alternator Missing Message |
Generator assembly or ECM communication stops for approximately 17 minutes or more with the ignition switch ON. (1 trip detection logic) |
|
Does not come on |
Charge warning light: Does not come on |
SAE Code: P161A |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
- Before replacing the ECM, refer to Registration.
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PROCEDURE
|
1. |
CHECK CHARGING SYSTEM |
Click here
| NG | .gif) |
REPAIR OR REPLACE CHARGING SYSTEM |
|
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|
2. |
CHECK HARNESS AND CONNECTOR (ECM - GENERATOR ASSEMBLY) |
(a) Disconnect the C76 ECM connector.
(b) Disconnect the C81 generator assembly connector.
(c) Disconnect the C133 battery state sensor assembly connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C76-62 (LIN) - C81-2 (LIN) |
Always |
Below 1 Ω |
|
C133-2 (LIN) - C81-2 (LIN) |
Always |
Below 1 Ω |
|
C76-62 (LIN), C133-2 (LIN) or C81-2 (LIN) - Body ground |
Ignition switch off |
10 kΩ or higher |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CLEAR DTC |
(a) Check for DTCs using the GTS, and then write them down.
Powertrain > Engine > Trouble Codes(b) Clear the DTCs.
Powertrain > Engine > Clear DTCs(c) Turn the ignition switch off and wait 30 seconds.
|
|
4. |
CHECK DTC OUTPUT |
(a) Start the engine.
(b) Allow the engine to idle for approximately 17 minutes or more.
(c) Check for DTCs.
Powertrain > Engine > Trouble Codes|
Result |
Proceed to |
|---|---|
|
Only P161A87 is output |
A |
|
P161A87 and P162B87 are output |
B |
|
DTCs are not output |
C |
| A | |
REPLACE GENERATOR ASSEMBLY |
| B | |
REPLACE ECM |
| C | |
CHECK FOR INTERMITTENT PROBLEMS |
READ NEXT:
Lost Communication with Battery Monitor Module Missing Message (P162B87)
DESCRIPTION
The ECM communicates with the battery state sensor assembly via LIN communication.
If a LIN communication error is detected, the ECM stores this DTC.
DTC No.
Dete
Battery is Discharged
DESCRIPTION
General causes of battery depletion include the switches of electrical devices
mistakenly left on, service life of the battery, charging device malfunction, or
application of excessiv
Charging Failure
PROCEDURE
1.
CHECK GENERATOR PULLEY WITH CLUTCH (ON-VEHICLE INSPECTION)
(a) Start the engine and visually check that the generator rotor assembly (fan)
in the gener
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DESCRIPTION
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