MULTI-MODE MANUAL TRANSAXLE SYSTEM, Diagnostic DTC:P0900

DTC Code	DTC Name
P0900	Clutch Actuator Circuit

DESCRIPTION

The clutch actuator is operated by the transmission control ECU and engages and disengages the clutch by the clutch master cylinder movement of the clutch actuator. An electric motor moves the clutch master cylinder, and the clutch stroke sensor, which is mounted on the clutch actuator assembly, detects the clutch master cylinder position. The transmission control ECU monitors the electrical current and clutch motor output terminal voltage, and detects malfunctions in the clutch motor circuit.

DTC No.	DTC Detection Condition	Trouble Area
P0900	The transmission control ECU detects the following conditions: (1-trip detection logic) Clutch motor is not energized. Voltages of clutch motor terminal (MCL+ or MCL-) is less than 0.5 V1, or more than threshold2 for 0.5 seconds.	Clutch actuator assembly (clutch motor) Wire harness or connector Transmission control ECU
The transmission control ECU detects the following conditions: (1-trip detection logic) Clutch motor is energized. Target clutch motor current is more than 5A. Actual clutch motor current is less than 1A*3.
The transmission control ECU detects the following conditions: (1-trip detection logic) Clutch motor is not energized. Difference between maximum and minimum voltages of clutch motor terminal (MCL+ or MCL-) is more than threshold*4 for 0.5 seconds.

DTC No.

DTC Detection Condition

Trouble Area

P0900

The transmission control ECU detects the following conditions:

(1-trip detection logic)

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

Clutch actuator assembly (clutch motor)
Wire harness or connector
Transmission control ECU

The transmission control ECU detects the following conditions:

(1-trip detection logic)

Clutch motor is energized.
Target clutch motor current is more than 5A.
Actual clutch motor current is less than 1A*3.

The transmission control ECU detects the following conditions:

(1-trip detection logic)

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

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

WIRING DIAGRAM

INSPECTION PROCEDURE

Note

installing the actuator Click here. The pull rods of new clutch actuator assemblies (service supply parts) are not set to the clutch clamp position.
In clutch actuator assembly replacement, perform Initialization and Learning of the multi-mode manual transaxle system after installing the actuator Click here. If the actuator is installed without the initialization and learning, it may cause driving performance degradation or system component breakage.

PROCEDURE

INSPECT TRANSMISSION CONTROL ECU (MCL TERMINAL VOLTAGE)

Turn the ignition switch to ON.

Text in Illustration
*a	Component with harness connected (Transmission Control ECU)

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
A49-6 (MCL+) - Body ground	Ignition switch ON	4.0 to 7.0 V
A49-5 (MCL-) - Body ground	Ignition switch ON	4.0 to 7.0 V

Turn the ignition switch off.

Click here

CHECK INTERMITTENT PROBLEMS Click here

CHECK TERMINAL CONDITION (TRANSMISSION CONTROL ECU)

Disconnect the A49 transmission control ECU connector.

Check the connections of the transmission control ECU connector.

OK
The transmission control ECU and wire harness connectors and connector terminals are connected securely and are not bent, rusted, or damaged.

CONNECT CORRECTLY

INSPECT CLUTCH ACTUATOR CIRCUIT

Text in Illustration
*a	Front view of wire harness connector (to Transmission Control ECU)

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
A49-6 (MCL+) - A49-5 (MCL-)	Always	0.1 to 100 Ω
A49-6 (MCL+) - Body ground	Always	10 kΩ or higher
A49-5 (MCL-) - Body ground	Always	10 kΩ or higher

Click here

REPLACE TRANSMISSION CONTROL ECU
1. Replace the transmission control ECU Click here.
NEXT
PERFORM INITIALIZATION
1. Perform the initialization and learning for multi-mode manual transaxle system Click here.
NEXT

END

CHECK CONNECTOR CONNECTION CONDITION (CLUTCH ACTUATOR)

Disconnect the B27 clutch actuator assembly connector.

Check the connections of the clutch actuator connector.

OK
The clutch actuator and wire harness connectors and connector terminals are connected securely and are not bent, rusted, or damaged.

CONNECT CORRECTLY

CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU - CLUTCH ACTUATOR)

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
A49-6 (MCL+) - B27-2	Always	Below 1 Ω
A49-5 (MCL-) - B27-1	Always	Below 1 Ω
A49-6 (MCL+) or B27-2 - Body ground	Always	10 kΩ or higher
A49-5 (MCL-) or B27-1 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

INSPECT CLUTCH ACTUATOR ASSEMBLY

Disconnect the B27 clutch motor connector.

Text in Illustration
*a	Component without harness connected (Clutch Actuator Assembly)

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
1 - 2	Always	0.1 to 100 Ω
1 - Body ground	Always	10 kΩ or higher
2 - Body ground	Always	10 kΩ or higher

Click here

CHECK INTERMITTENT PROBLEMS Click here

REPLACE CLUTCH ACTUATOR ASSEMBLY
1. Replace the clutch actuator assembly Click here.
NEXT
PERFORM INITIALIZATION
1. Perform the initialization and learning for multi-mode manual transaxle system Click here.
NEXT

END