RM36D0EC _57 Power Source / Network _087045 M20C-FKS BATTERY / CHARGING _0418150 CHARGING SYSTEM C

M20C-FKS BATTERY / CHARGING  CHARGING SYSTEM  P161A87  Lost Communication with Alternator Missing Message  


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 ignition switch ON
(1 trip detection logic)
·

Wire harness or connector

·

Generator assembly

·

ECM


Charge warning light does not come on DTC stored SAE: P161A

WIRING DIAGRAM

A427236E37
0.615,0.688 1.427,0.906 0.813,0.219 10 false from Battery 1.698,0.854 2.51,1.073 0.813,0.219 10 false BATT-S 2.5,0.625 2.635,0.833 0.135,0.208 10 false 3 2.677,0.708 2.927,0.938 0.25,0.229 10 false +B 3.76,0.719 4.01,0.948 0.25,0.229 10 false LIN 4.042,0.573 4.292,0.802 0.25,0.229 10 false 2 2.417,1.167 2.802,1.427 0.385,0.26 10 false A128 2.427,1.323 4.542,1.552 2.115,0.229 10 false Battery State Sensor Assembly 2.667,2.667 3.052,2.927 0.385,0.26 10 false C46 2.646,2.823 4.76,3.052 2.115,0.229 10 false Generator Assembly 1.083,3.177 3.198,3.406 2.115,0.229 10 false : LIN Communication Line 5.844,0.719 6.135,0.958 0.292,0.24 10 false LIN 5.583,0.542 5.833,0.771 0.25,0.229 10 false 90 6.063,1.813 6.354,2.052 0.292,0.24 10 false C71 6.073,1.979 6.583,2.208 0.51,0.229 10 false ECM 3.75,2.167 4.26,2.396 0.51,0.229 10 false LIN 4.031,2.052 4.281,2.281 0.25,0.229 10 false 2

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
a.

Check the charging system.

Click herePower Source / Network>M20C-FKS (BATTERY / CHARGING)>CHARGING SYSTEM>ON-VEHICLE INSPECTION


Result:
Proceed to
OK
NG



OK

2.CHECK HARNESS AND CONNECTOR (ECM - GENERATOR ASSEMBLY)

NG

REPAIR OR REPLACE CHARGING SYSTEM

2.CHECK HARNESS AND CONNECTOR (ECM - GENERATOR ASSEMBLY)
a.

Disconnect the ECM connector.


b.

Disconnect the generator assembly connector.


c.

Disconnect the 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
C46-2 (LIN) - C71-90 (LIN) Always Below 1 Ω


Standard Resistance (Check for Short):
Tester Connection Condition Specified Condition
A128-2 (LIN), C46-2 (LIN) or C71-90 (LIN) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

3.CLEAR DTC

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CLEAR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Enter the following menus: Powertrain / Engine / Trouble Codes.


e.

Check for DTCs, and then write them down.

Powertrain > Engine > Trouble Codes
50001 372

f.

Enter the following menus: Powertrain / Engine / Trouble Codes.


g.

Clear the DTCs.

Powertrain > Engine > Clear DTCs
50002 372

h.

Turn the ignition switch off and wait 30 seconds.


Result:
Proceed to
NEXT



NEXT

4.CHECK DTC OUTPUT
4.CHECK DTC OUTPUT
a.

Connect the GTS to the DLC3.


b.

Start the engine.


c.

Allow the engine to idle for approximately 17 minutes or more.


d.

Turn the GTS on.


e.

Enter the following menus: Powertrain / Engine / Trouble Codes.


f.

Check for DTCs.

Powertrain > Engine > Trouble Codes
50001 372

Result:
Result Proceed to
Only DTC P161A87 is output. A
DTC P161A87 and P162B87 are output. B
DTCs are not output. C



A

REPLACE GENERATOR ASSEMBLY

Click herePower Source / Network>M20C-FKS (BATTERY / CHARGING)>GENERATOR>REMOVAL


B

REPLACE ECM

Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>ECM>REMOVAL


C

CHECK FOR INTERMITTENT PROBLEMS

Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>SFI SYSTEM>CHECK FOR INTERMITTENT PROBLEMS