RM36D0EC _52 Drivetrain _138817 K121F CVT _0596468 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM C

K121F CVT  CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM  P172A7E  Starter Enable Relay Actuator Stuck On  


DESCRIPTION

When the shift lever is in P or N, the ECM sends the shift state signal to the certification ECU (smart key ECU assembly).

Certification ECU (smart key ECU assembly) operates the starter assembly only when the shift lever is in P or N.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL DTC Output from Priority Note
P172A7E Starter Enable Relay Actuator Stuck On All of the following conditions are met for 0.3 seconds or more (1-trip detection logic):
·

Within 3 seconds after engine start

·

The shift lever is in other than P or N and the stop and start system is not operating

·

The starter signal is ON


·

Certification ECU (Smart key ECU assembly)

·

Wire harness or connector

·

ECM


Does not come on Engine B SAE Code:
P172B

MONITOR DESCRIPTION

When the ECM has not given permission for starter operation and a starter signal is received, the ECM detects the malfunction and stores this DTC.

CONFIRMATION DRIVING PATTERN

NOTICE:

Perform the confirmation driving pattern with the AUTO function (shift-linked function) of the electric parking brake system off.


HINT:

After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.


1.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

2.

Turn the ignition switch off and wait for 2 minutes or more.

3.

Fully apply the parking brake and chock all 4 wheels.

HINT:

When the parking brake indicator (red) is illuminated after the electric parking brake switch (integration control and panel assembly) has been pulled to the lock side, the maximum amount of braking force is applied if the electric parking brake switch (integration control and panel assembly) is pulled to the lock side one more time.


4.

Keep your left foot firmly on the brake pedal and move the shift lever to R.

5.

Turn the ignition switch on (Start).

6.

Keep your left foot firmly on the brake pedal and move the shift lever to D.

7.

Turn the ignition switch on (Start).

8.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

9.

Input the DTC: P172A7E.

10.

Check the DTC judgment result.

GTS Display Description
NORMAL
·

DTC judgment completed

·

System normal


ABNORMAL
·

DTC judgment completed

·

System abnormal


INCOMPLETE
·

DTC judgment not completed

·

Perform driving pattern after confirming DTC enabling conditions


N/A
·

Unable to perform DTC judgment

·

Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit



HINT:
·

If the judgment result shows NORMAL, the system is normal.

·

If the judgment result shows ABNORMAL, the system has a malfunction.

·

If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.




WIRING DIAGRAM

C502586E21
5.844,1.635 7.073,1.844 1.229,0.208 10 false A116*1, A125*2 5.844,1.813 6.458,2.01 0.615,0.198 10 false ECM 0.344,1.813 2.156,2.26 1.813,0.448 10 false Certification ECU (Smart Key ECU Assembly) 0.354,1.656 1.479,1.854 1.125,0.198 10 false A126 1,0.74 1.615,0.938 0.615,0.198 10 false STA 5.865,0.729 6.479,0.927 0.615,0.198 10 false PPOS 5.594,0.594 6.208,0.792 0.615,0.198 10 false 81 1.396,0.594 2.01,0.792 0.615,0.198 10 false 3 2.417,2.083 5.021,2.281 2.604,0.198 10 false *1: for SFTM Made 2.417,2.396 5.021,2.594 2.604,0.198 10 false *2: for GTMC Made

CAUTION / NOTICE / HINT

NOTICE:
·

Perform registration and/or initialization when parts related to the continuously variable transaxle system are replaced.

Click hereDrivetrain>K121F (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>PRECAUTION

·

Check that no DTCs are stored after performing initialization.

Click hereDrivetrain>K121F (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>DTC CHECK / CLEAR



HINT:

If any DTCs other than P172A7E are output, perform troubleshooting for those DTCs first.


PROCEDURE

1.CHECK DTC OUTPUT (HEALTH CHECK)
a.

Using the GTS, perform a Health Check.

Result:
Result Proceed to
Only P172A7E is output A
P172A7E and other DTCs are output B




A

2.INSPECT ECM (PPOS VOLTAGE)

B

GO TO DTC CHART

2.INSPECT ECM (PPOS VOLTAGE)

Pre-procedure1

a.

Disconnect the A126 smart key ECU assembly connector.


b.

Turn the ignition switch to ON.


Procedure1

c.
C532077C01
1.521,0.302 2.01,0.573 0.49,0.271 1.531,1.833 1.24,1.042 true 1.615,0.365 2.229,0.563 0.615,0.198 10 false A126 0.208,0.208 0.521,0.406 0.313,0.198 10 false *a 1.417,1.896 1.875,2.094 0.458,0.198 10 false STA
*a Front view of wire harness connector (to smart key ECU assembly)


Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition
A126-3 (STA) - Body ground Ignition switch ON, shift lever in P or N 11 to 14 V
A126-3 (STA) - Body ground Ignition switch ON, shift lever not in P or N Below 1 V


Result:
Proceed to
OK
NG



Post-procedure1

d.

Turn the ignition switch off.


e.

Connect the A126 smart key ECU assembly connector.



OK

CHECK SMART ENTRY AND START SYSTEM (CHECK FOR STAR TERMINAL VOLTAGE OF CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM (for Start Function, Gasoline Model)>TERMINALS OF ECU


NG

3.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU) - ECM)
3.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU) - ECM)

Pre-procedure1

a.

Disconnect the A126 smart key ECU assembly connector.


b.

for SFTM Made:

Disconnect the A116 ECM connector.


c.

for GTMC Made:

Disconnect the A125 ECM connector.


Procedure1

d.

Measure the resistance according to the value(s) in the table below.

Standard Resistance (for SFTM Made):
Tester Connection Condition Specified Condition
A126-3 (STA) or A116-81 (PPOS) - Other terminals Always 10 kΩ or higher


Standard Resistance (for GTMC Made):
Tester Connection Condition Specified Condition
A126-3 (STA) or A125-81 (PPOS) - Other terminals Always 10 kΩ or higher


Result:
Proceed to
OK
NG



Post-procedure1

e.

for SFTM Made:

Connect the A116 ECM connector.


f.

for GTMC Made:

Connect the A125 ECM connector.


g.

Connect the A126 smart key ECU assembly connector.



OK

4.REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR