Toyota Yaris: Charging System / 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 | 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) |
| Comes 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 Service Bulletin.
PROCEDURE
| 1. | CHECK CHARGING SYSTEM |
Click here
| NG |
 | REPAIR OR REPLACE CHARGING SYSTEM |
|
| 2. | CHECK HARNESS AND CONNECTOR (ECM - GENERATOR ASSEMBLY) |
(a) Disconnect the D104 ECM connector.
(b) Disconnect the D53 generator assembly connector.
(c) Disconnect the O68 battery state sensor assembly connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| O68-2 (LIN) or D53-2 (LIN) - D104-62 (LIN) | Always | Below 1 Ω |
Standard Resistance (Check for Short):
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| O68-2 (LIN), D53-2 (LIN) or D104-62 (LIN) - Body ground | Ignition switch off (while LIN communication stopped) | 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
|
| 4. | CHECK DTC OUTPUT |
(a) Start the engine.
(b) Allow the engine to idle for approximately 17 minutes or more.
(c) Using the GTS, 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 WITH REGULATOR ASSEMBLY |
| B |
 | REPLACE ECM |
| C |
 | CHECK FOR INTERMITTENT PROBLEMS |
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Other information:
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Key Suspend Function
If a key is left in the vehicle, the functions of the key left in the vehicle are temporarily suspended to prevent theft of the vehicle.
To restore the functions, press the unlock button on the functions-suspended key in the vehicle.
