#
ON-BOARD DIAGNOSTIC (OBD) SYSTEM DESCRIPTION [JA5A-EL]

BME050200000T10
• The OBD system has the following functions:

  - Failure detection function: detects failure of the input/output devices and system components of the ATX.
  - Memory function: stores the DTC when a failure is detected.
  - Fail-safe function: fixes the output device function and input value of the sensors/switches to ensure minimum vehicle drivability when a failure is detected.
  - PID data monitoring function: monitors the input/output signal and calculated value of the TCM and sends the monitoring data to the scan tool.

## Block Diagram

## DTC Comparison Lists

• The following codes are divided to improve serviceability.

Part Name | DTC | Definition
--- | --- | ---
Transaxle range switch | P0705 | Circuit malfunction (power short)
P0706 | Circuit malfunction (open/ground short)
Transaxle fluid temperature sensor | P0711 | Malfunction (stuck): for Israeli specs. N/A: except for Israeli specs.
P0712 | Circuit malfunction (short)
P0713 | Circuit malfunction (open)
Input/turbine speed sensor | P0715 | Circuit malfunction (open/short)
Vehicle speedometer sensor | P0720 | Circuit malfunction (open/short)
Torque converter | P0740 | Circuit malfunction: for Israeli specs. N/A: except for Israeli specs.
TCC control solenoid valve | P0743 | Circuit malfunction (open/short)
Pressure control solenoid | P0748 | Circuit malfunction (open/short)
Shift solenoid A | P0751 | Malfunction (stuck off): for Israeli specs. N/A: except for Israeli specs.
P0752 | Malfunction (stuck on): for Israeli specs. N/A: except for Israeli specs.
P0753 | Circuit malfunction (open/short)
Shift solenoid B | P0756 | Malfunction (stuck off): for Israeli specs. N/A: except for Israeli specs.
P0757 | Malfunction (stuck on): for Israeli specs. N/A: except for Israeli specs.
P0758 | Circuit malfunction (open/short)
Shift solenoid C | P0761 | Malfunction (stuck off): for Israeli specs. N/A: except for Israeli specs.
P0762 | Malfunction (stuck on): for Israeli specs. N/A: except for Israeli specs.
P0763 | Circuit malfunction (open/short)
Reduction timing solenoid valve | P0768 | Circuit malfunction (open/short)
Neutral shift solenoid valve | P0773 | Circuit malfunction (open/short)
2-4 brake solenoid valve | P0778 | Circuit malfunction (open/short)
Intermediate sensor | P0791 | Circuit malfunction (open/short)
High clutch solenoid valve | P0798 | Circuit malfunction (open/short)
GND return | P1710 | Circuit malfunction (open)
CAN | U0073 | CAN BUS OFF
CAN | U0100 | TCM cannot receive any signals from PCM

## Failure Detection Function

• The failure detection function detects failures in the input/output signal system (when the IG switch is on or while driving).
• When a failure is detected, the DTCs in the DTC chart are outputted to FAT terminal in the DLC through the failure indication function. At the same time, the failure detection results are sent to the fail-safe function and the memory function.
• If a failure is detected, the HOLD indicator light flashes or illuminates to warn the driver of a malfunction in the powertrain system components or sensor/switches. (Also, MIL will be illuminated except for DTC P0748)

## Memory Function

• The memory function stores the signal systems that are determined as failures by the failure detection function. The memory is not erased even if the IG switch is turned off (LOCK position) or the detected failures are recovered.
• To clear the stored failure information, disconnect the negative battery cable.

## Failure Indication Function

• The signal system which has been judged to be abnormal by the failure detection function is sent to the HOLDF indicator light and DLC (FAT terminal) as a DTC.

### When using voltmeter

  • The DTC can be checked by fluctuation of the voltmeter needle.
  • Each DTC consists of four digits. These numbers are indicated by four separate indication of two-digit number, a combination of "1" and each number of the code.

### When using HOLD indicator light

  • When the TAT terminal is shorted after the IG switch is turned on, the HOLD indicator light indicates the DTCs.
  • Each DTC consists of four digits. These numbers are indicated by four separate indication of two-digit number, a combination of "1" and each number of the code.

## DTC Table

DTC No. | On-board diagnostic function | MIL | HOLD indicator light flash | DC | Monitor item | Memory function
--- | --- | --- | --- | --- | --- | ---
P0705 | TR switch circuit malfunction (power short circuit) | ON | YES | 2 | CCM | X
P0706 | TR switch circuit malfunction (open/ground short circuit) | ON | YES | 2 | CCM | X
P0711* | TFT sensor malfunction (stuck) | ON | NO | 2 | CCM | X
P0712 | TFT sensor circuit malfunction (short circuit) | ON | YES | 2 | CCM | X
P0713 | TFT sensor circuit malfunction (open circuit) | ON | YES | 2 | CCM | X
P0715 | Input/turbine speed sensor circuit malfunction | ON | YES | 2 | CCM | X
P0720 | Vehicle speedometer sensor circuit malfunction | ON | YES | 2 | CCM | X
P0740* | TCC system | ON | NO | 2 | CCM | X
P0743 | TCC solenoid valve malfunction (open/short) | ON | YES | 1 | CCM | X
P0748 | Pressure control solenoid malfunction (open/short) | OFF | YES | - | CCM | X
P0751* | Shift solenoid A malfunction (stuck off) | ON | NO | 2 | CCM | X
P0752* | Shift solenoid A malfunction (stuck on) | ON | NO | 2 | CCM | X
P0753 | Shift solenoid A malfunction (open/short) | ON | YES | 1 | CCM | X
P0756* | Shift solenoid B malfunction (stuck off) | ON | NO | 2 | CCM | X
P0757* | Shift solenoid B malfunction (stuck on) | ON | NO | 2 | CCM | X
P0758 | Shift solenoid B malfunction (open/short) | ON | YES | 1 | CCM | X
P0761* | Shift solenoid C malfunction (stuck off) | ON | NO | 2 | CCM | X
P0762* | Shift solenoid C malfunction (stuck on) | ON | NO | 2 | CCM | X
P0763 | Shift solenoid C malfunction (open/short) | ON | YES | 1 | CCM | X
P0768 | Reduction timing solenoid malfunction (open/short) | OFF | YES | - | CCM | X
P0773 | Neutral shift solenoid malfunction (open/short) | OFF | YES | - | CCM | X
P0778 | 2-4 brake solenoid malfunction (open/short) | OFF | YES | - | CCM | X
P0791 | Intermediate sensor malfunction (open/short) | ON | YES | 2 | CCM | X
P0798 | High clutch solenoid malfunction (open/short) | OFF | YES | - | CCM | X
P1710 | GND return malfunction | OFF | NO | - | Other | X
U0073 | CAN BUS OFF | ON | YES | 1 | CCM | X
U0100 | TCM cannot receive any signals from PCM | ON | YES | 1 | CCM | X

  X :
Available
  * :
Israeli specs.

## Fail-safe Function

• In the fail-safe function, minimum vehicle drivability is obtained by changing the signals that are determined as malfunctions by the failure detection function to the preset values, and limiting the TCM control.

DTC No. | On-board diagnostic function | Detection condition | Fail-safe | TCC | HOLD mode selection
--- | --- | --- | --- | --- | ---
P0705 | Transaxle range (TR) switch circuit malfunction (power short circuit) | • Two or more range signals are inputted from TR switch for 5 seconds or more | • TR switch priority D > N > P > R > S > L • Inhibits feedback control, SLOPE mode, torque reduction control | Available | Available
P0706 | Transaxle range (TR) switch circuit malfunction (open/ground short circuit) | • No range signal is inputted from TR switch for 100 seconds or more | • Inhibits feedback control, SLOPE mode, torque reduction control | Available | Available
P0711* | Transaxle fluid temperature (TFT) sensor malfunction (stuck) | • TFT sensor signal stays outside normal temperature range for 10 minute or more | - | Available | Available
P0712 | Transaxle fluid temperature (TFT) sensor circuit malfunction (short circuit) | • Signals form TFT sensor are 155 °C {311 °F} or greater for 10 min. | • Inhibits feedback control • Engine coolant temperature signal are used for shifting. | Available | Available
P0713 | Transaxle fluid temperature (TFT) sensor circuit malfunction (open circuit) | • Vehicle speed is 20 km/h {12.4 mph} or greater, and signals from TFT sensor are -30 °C {-22 °F} or less for 150 seconds or more | Available | Available
P0715 | Input/turbine speed sensor circuit malfunction | • Input/turbine speed sensor is 600 rpm or less while engine speed is 1500 rpm or greater and vehicle speed is 40 km/h {24.8 mph} or greater in D, S, or L ranges. | • Inhibits shift control | Available | Available
P0720 | Vehicle speedometer sensor circuit malfunction | • Vehicle speedometer sensor is 150 rpm or less while intermediate sensor 1400 rpm or greater in D, S, or L range for 2 second or more. | • Inhibits SLOPE mode, feedback control, torque reduction control | Available | Available
P0740* | Torque converter clutch (TCC) system | • RPM difference between crankshaft (engine speed signal) and reverse clutch drum (input/turbine speed sensor signal) exceeds the pre-programmed value | - | Available | Available
P0743 | Torque converter clutch (TCC) solenoid valve malfunction (open/short) | • Open or short in torque converter clutch solenoid valve circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving of TCC solenoid valve (OFF) | Inhibition | Available
P0748 | Pressure control solenoid malfunction (open/short) | • Open or short in pressure control solenoid circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving of pressure control solenoid, 2-4 brake solenoid valve, and high clutch solenoid valve (OFF) • Inhibit feedback control. | Available | Available
P0751* | Shift solenoid A malfunction (stuck off) | • Difference between actual gear ratio and gear ratio set in TCM is large | - | Available | Available
P0752* | Shift solenoid A malfunction (stuck on) | • Difference between actual gear ratio and gear ratio set in TCM is large | - | Available | Available
P0753 | Shift solenoid A malfunction (open/short) | • Open or short in shift solenoid A circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving all ON/OFF type solenoids (OFF) and TCC solenoid valve (OFF) | Inhibition | Inhibition
P0756* | Shift solenoid B malfunction (stuck off) | • Difference between actual gear ratio and gear ratio set in TCM is large | - | Available | Available
P0757* | Shift solenoid B malfunction (stuck on) | • Difference between actual gear ratio and gear ratio set in TCM is large | - | Available | Available
P0758 | Shift solenoid B malfunction (open/short) | • Open or short in shift solenoid B circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving all ON/OFF type solenoids (OFF) and TCC solenoid valve (OFF) | Inhibition | Inhibition
P0761* | Shift solenoid C malfunction (stuck off) | • Difference between actual gear ratio and gear ratio set in TCM is large | - | Available | Available
P0762* | Shift solenoid C malfunction (stuck on) | • Difference between actual gear ratio and gear ratio set in TCM is large | - | Available | Available
P0763 | Shift solenoid C malfunction (open/short) | • Open or short in shift solenoid C circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving all ON/OFF type solenoids (OFF) and TCC solenoid valve (OFF) | Inhibition | Inhibition
P0768 | Reduction timing solenoid valve malfunction (open/short) | • Open or short in reduction timing solenoid valve circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving of reduction timing solenoid valve (OFF) | Available | Available
P0773 | Neutral shift solenoid valve malfunction (open/short) | • Open or short in neutral shift solenoid valve circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving of neutral shift solenoid valve (OFF) | Available | Available
P0778 | 2-4 brake solenoid valve malfunction (open/short) | • Open or short in 2-4 brake solenoid valve circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving of pressure control solenoid, 2-4 brake solenoid valve, and high clutch solenoid valve (OFF) • Inhibit feedback control. | Available | Available
P0791 | Intermediate sensor malfunction (open/short) | • Rotation speed of output gear (intermediate sensor) is low when vehicle speed and engine speed exceed the pre programmed value | • Inhibit feedback control • Inhibits torque reduction control | Available | Available
P0798 | High clutch solenoid valve malfunction (open/short) | • Open or short in high clutch solenoid valve circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving of pressure control solenoid, 2-4 brake solenoid valve, and high clutch solenoid valve (OFF) • Inhibit feedback control. | Available | Available
P1710 | GND return malfunction | • TCM detects open in GND return signal of solenoid. | - | Available | Available
U0073 | CAN BUS OFF | • CAN controller damaged. | • Throttle valve opening angle is fixed (4/8) at the time in order to determine shift • Maximizes line pressure | Inhibition | Available
U0100 | TCM cannot receive any signals from PCM | • TCM cannot receive any signals from PCM

  * :
Israeli specs.

## Parameter Identification (PID) Access

Monitor item table

Display on the tester | Definition | Unit/Condition | TCM terminal
--- | --- | --- | ---
24B_Duty | 2-4 brake solenoid valve control signal in TCM | % | 2V
BOO TCM | Brake switch | on/off | 1U
PNP_TCM | TR switch (P/N position switch) | Drive/Neutral | -
FAT | FAT terminal (DLC in engine compartment) | on/off | 1Q
GEAR | Calculated gear range in TCM | 1/2/3/4/5 | -
HC_Duty | High clutch solenoid valve control signal in TCM | % | 2U
LPS | Pressure control solenoid control signal in TCM | % | 2Y
N_SFT | Neutral shift solenoid valve control signal in TCM | on/off | 2D
OSS | Intermediate sensor | RPM | 1K, 1X
RDCN_TIM | Reduction timing solenoid valve control signal in TCM | on/off | 2G
RPM_TCM | Engine speed | RPM | -
SSA/SS1 | Shift solenoid A control signal in TCM | on/off | -
SSB/SS2 | Shift solenoid B control signal in TCM | on/off | -
SSC/SS3 | Shift solenoid C control signal in TCM | on/off | -
TAT | TAT terminal (DLC in engine compartment) | on/off | 1A
TCCC | TCC solenoid valve control signal in TCM | % | 2S
TCIL | HOLD indicator light control signal in TCM | on/off | 1E
TCS | HOLD switch | on/off | 2I
TFT | ATF temperature | °C, °F | 1B, 1F
TFTV | ATF temperature signal voltage | V | 1B, 1F
THOP | Throttle position | % | -
TRD | Tr switch (D range switch) | on/off | 1Z
TRL | TR switch (L range switch) | on/off | 2C
TRR | TR switch (R position switch) | on/off | 1W
TRS | TR switch (S range switch) | on/off | 1AA
TSS | Input/turbine speed sensor | RPM | 1N, 2F
VPWR_TCM | Battery voltage | V | 1P
VSS_TCM | Vehicle speed | KPH, MPH | 1V, 1M