Component Tests and General Diagnostics
Transmission Link Harness Electrical Connector LayoutElectrostatic Discharge
CAUTION: When working with the Transmission Control Module (TCM) and main control valve body, all suitable safety precautions must be taken to protect the component against electrostatic discharge. Failure to follow these instructions may result in component damage.
Make sure all possible safety precautions are taken to protect the TCM and main control valve body unit against electrostatic discharge
Personal Wrist-Band Earthing
Earthing (grounding) by means of a wrist bond or strap is the most reliable method of diverting electrostatic charges away from working personnel, and should therefore be used wherever possible, particularly if the person concerned is working while seated. The wrist bond earthing (grounding) device consists of a bracelet closely attached to the wrist and a spiral earthing (grounding) cable connecting it to the earthing (grounding) contact point. This system must include a quick-release device so that the wrist can be released in the event of danger.
Shoes and Foot Earthing Straps
Electrically conductive shoes should be worn by persons who mainly work standing up or either standing or sitting in ESD protection zones, particularly if wrist bond earthing (grounding) is impracticable. The standard calls for ESD shoes to record values between 0 and 35 Megga-ohms (MOhm) resistance. However, for anti-static working shoes resistance values between 0.1 and 1000 MOhm are called for, and a through-conducting resistance for protective shoes of 0.1 to 100 MOhm. A lower limit value of not less than 0.1 MOhm must be maintained on account of the contact voltage risk. For this reason the minimum value has been set contrary to the standard at the higher figure of 0.75 MOhm.
Transmission Link Harness Electrical Connector Layout
Part 1:
CAUTION: When working with the Transmission Control Module (TCM) and main control valve body, all suitable safety precautions must be taken to protect the component against electrostatic discharge.
CAUTION: Do not carry out any electrical tests on the TCM and main control valve body. Failure to follow these instructions may result in component damage.
CAUTION: Make sure all suitable safety precautions are taken to protect the Transmission Control Module (TCM) and main control valve body electrical connector pins against electrostatic discharge.
Part 2:
Transmission Link Harness Electrical Connector
Clutch Application Chart
Solenoids
CAUTION: When working with the Transmission Control Module (TCM) and main control valve body, all suitable safety precautions must be taken to protect the component against electrostatic discharge.
CAUTION: Do not carry out any electrical tests on the TCM and main control valve body. Failure to follow these instructions may result in component damage.
The hydraulic module contains one solenoid valve. The solenoid valve is actuated by the TCM and has two positions (open or closed), it is used to switch the position valve.
There are six electronic pressure control valves, these convert an electric current into a proportional hydraulic pressure. They are energized by the TCM and actuate the valves belonging to the relevant switching elements.
Two types of electronic pressure regulator are installed:
1. Pressure regulator with a rising characteristic (1,3,6 green cap) i.e. as current increases pressure increases (0mA = 0 bar / 700mA = 4.6 bar)
2. Pressure regulator with a falling characteristic (2,4,5 black cap) i.e. as current increases the pressure drops (0mA = 4.6 bar / 700 mA = 0 bar)
Both types of regulator have a resistance value of approximately 5 Ohms at 20°C.
Solenoid Application Chart
System inputs and outputs
System inputs
The TCM uses the permanent voltages supply to support and to maintain data in the Random Access Memory (RAM).
The Term. 15 input is used to wake up the TCM. Once awake the TCM commences its initialization sequence. This input is not a power supply input to the TCM. For initialization to commence the ignition must be switched to the "II2 position and be above 7V but below 16V (30ms after term. 15 signal on, the initialization of the TCM starts). Initialization time is 500ms max. Men initialization is finished, the Drive Program is started and TCM has full functionality.
The TCM has one internal solenoid ground for all internal solenoids (SV and PR).
This internal input acts as the ground for position switch. The TCM requires two vehicle ground supplies. (Term.31).
Both ground wires are linked to one grounding point on the vehicle. The TCM incorporates polarity reversal protection.
System outputs
The P/N signal (from the internal position sensor) is used to ensure that the engine is only started with the transmission gear selector in either the Park or Neutral position. Men the selector is in either Park or Neutral this output is activated. This in turn doses a relay that allows the starter to be engaged if allowed by the Engine management system. If this output fails the electronic engine controls system uses a CAN bus signal supplied by the TCM to allow the engine to start.
Transmission control
The selector lever can be used to engage Park through to drive (D) mechanically. The link between the lever and the transmission is by a cable.
The manual side of the shifter, 5 through to position 2 are selected electronically by the CAN bus. Integrated with this are functions for gear selected illumination, brake shift interlock and keylock interlock system.