Lexus ES: 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 | Warning Indicate | Memory | Note |
|---|---|---|---|---|---|---|
| P161A87 | Lost Communication with Alternator Missing Message | Generator assembly or ECM communication stops for approximately 17 minutes or more with the engine switch on (IG). (1 trip detection logic) |
| Charge warning is not displayed | DTC stored | SAE Code: P161A |
WIRING DIAGRAM
PROCEDURE
| 1. | CHECK CHARGING SYSTEM |
(a) Check the charging system.
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| NG | .gif) | REPAIR OR REPLACE CHARGING SYSTEM |
|
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| 2. | CHECK HARNESS AND CONNECTOR (ECM - GENERATOR ASSEMBLY) |
(a) Disconnect the or C77 ECM connector.
(b) Disconnect the C33 generator assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| C77-62 (LIN) - C33-2 (LIN) | Always | Below 1 Ω |
| C77-62 (LIN) or C33-2 (LIN) - body ground | Always | 10 kΩ or higher |
| OK | | REPLACE GENERATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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