MULTI-MODE MANUAL TRANSAXLE SYSTEM, Diagnostic DTC:P0920

DTC Code	DTC Name
P0920	Gear Shift Forward Actuator Circuit

DESCRIPTION

The shift and select actuator is operated by the TCM and changes the transaxle gear by the shift and select lever shaft movement. An electric motor (shift motor) moves the shift and select lever shaft in the shift direction, and the shift stroke sensor, which is mounted on the shift and select actuator assembly, detects the shift position. The TCM monitors the electrical current and shift motor output terminal voltage, and detects malfunctions in the shift motor circuit.

DTC No.	DTC Detection Condition	Trouble Area
P0920	The TCM detects the following conditions: (1-trip detection logic) Shift motor is not energized. Voltages of shift motor terminal (MSF+ or MSF-) is less than 0.5 V1, or more than threshold2 for 0.5 seconds.	Shift and select actuator assembly (shift motor) Short in shift motor circuit TCM
The TCM detects the following conditions: (1-trip detection logic) Shift motor is energized. Target shift motor current is more than 5A. Actual shift motor current is less than 1A*3.	Shift and select actuator assembly (shift motor) Open in shift motor circuit TCM
The TCM detects the following conditions: (1-trip detection logic) Shift motor is not energized. Difference between maximum and minimum voltages of shift motor terminal (MSF+ or MSF-) is more than threshold*4 for 0.5 seconds.

DTC No.

DTC Detection Condition

Trouble Area

P0920

The TCM detects the following conditions:

(1-trip detection logic)

Shift motor is not energized.
Voltages of shift motor terminal (MSF+ or MSF-) is less than 0.5 V*1, or more than threshold*2 for 0.5 seconds.

Shift and select actuator assembly (shift motor)
Short in shift motor circuit
TCM

The TCM detects the following conditions:

(1-trip detection logic)

Shift motor is energized.
Target shift motor current is more than 5A.
Actual shift motor current is less than 1A*3.

Shift and select actuator assembly (shift motor)
Open in shift motor circuit
TCM

The TCM detects the following conditions:

(1-trip detection logic)

Shift motor is not energized.
Difference between maximum and minimum voltages of shift motor terminal (MSF+ or MSF-) is more than threshold*4 for 0.5 seconds.

*1: A short between the shift motor circuit and the body ground is suspected.
*2: A short between the shift motor circuit and the +B circuit is suspected.
*3: An open in the shift motor circuit is suspected. When the motor current does not flow to the ECU terminals despite the ECU ordering the shift motor to operate, the ECU sets the DTC.
*4: An open in the shift motor circuit is suspected. When the difference is more than the threshold despite the ECU not ordering the shift motor to operate, the ECU sets the DTC.

WIRING DIAGRAM


*a	SHIFT AND SELECT ACTUATOR ASSEMBLY (Shift Motor)

CAUTION / NOTICE / HINT

Note

In shift stroke sensor or shift and select actuator assembly replacement, perform the [Initialization and Learning] procedure (See page ) and [Synchronization Position Calibration] procedure Click here after installing the sensor or actuator assembly. If the sensor or actuator is installed without performing [Initialization and Learning] and [Synchronization Position Calibration], it may cause driving performance degradation or system component breakage.

PROCEDURE

INSPECT SHIFT AND SELECT ACTUATOR ASSEMBLY (SHIFT MOTOR)

Text In Illustration
*a	Component without harness connected (Shift and Select Actuator Assembly (Shift Motor))

Disconnect the B58 shift motor connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
1 - 2	Always	0.1 to 100 Ω

REPLACE SHIFT AND SELECT ACTUATOR ASSEMBLY Click here

CHECK HARNESS AND CONNECTOR (SHIFT AND SELECT ACTUATOR - TCM)

Disconnect the A46 TCM connector.
Disconnect the B58 shift motor connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A46-3 (MSF-) - B58-1	Always	Below 1 Ω
A46-4 (MSF+) - B58-2	Always	Below 1 Ω
A46-3 (MSF-) - Body ground	Always	10 kΩ or higher
A46-4 (MSF+) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE TCM
1. Replace the TCM Click here.
NEXT
PERFORM INITIALIZATION
1. Perform the initialization and learning for multi-mode manual transaxle system Click here.
NEXT
END
REPLACE SHIFT AND SELECT ACTUATOR ASSEMBLY
1. Replace the shift and select actuator assembly Click here.
NEXT
PERFORM INITIALIZATION
1. Perform the initialization and learning for multi-mode manual transaxle system Click here.
NEXT
END