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First off you need to understand your vehicle has several control modules on board . The PCM - engine computer , TCM - transmission control module , SRS - air bag module , Anti theft , antilock brakes , An these modules all are able to talk to each other on a communication network , On your vehicle it happens to be the CAN data bus !
The transmission control module (TCM) uses the controller area network (CAN) to signal the engine control module (ECM) that the TCM is requesting malfunction indicator lamp (MIL) illumination. This happens when the TCM has determined that a failure that affects emissions has occurred in the transmission control system. When the ECM receives the correct message from the TCM, DTC P0700 will set.
Which transmission does your vehicle have ?
Automatic Transaxle AF23-5
Automatic Transmission VT25-E
The controller area network (CAN) serial data line is a high speed serial data bus used to communicate information between the engine control module (ECM), body control module (BCM), and the transmission control module (TCM). Typical data-transmission speeds must be high enough to ensure the required real-time response is maintained. The CAN serial data line does not communicate with the scan tool via the data link connector (DLC). CAN serial data information is interpreted by the BCM and transmitted to the serial data line by the BCM.
I suggest you take this to GM dealer or some other ASE certified repair shop .
Tcm= transmission control module ecm= engine control module. Vehicles with an automatic transmission are equipped with both of these. Many vehicles now have what is called a PCM, which is a powertrain control module and is Both the TCM and ECM in one controller. Feel free to ask if you need any further assistance. Regards,-Tim
Transmission Range Sensor Circuit Range/Performance
The purpose of the automatic transmission is to match the engine's optimum power and torque characteristics to the driver's desired rate of acceleration and speed by auto-selecting different gear ratios or 'speeds' to power the wheels. The Transmission Range Sensor (also referred to as the PRNDL input and/or neutral safety switch) tells the transmission control module (TCM) and the powertrain control module (PCM) that the transmission is in park, reverse, neutral, drive, low, 2nd, 3rd etc. It is attached directly to the manual valve of transmission, so when the shift lever is moved say from park to drive, the Transmission Range Sensor communicates this critical information to the above mentioned vehicle computer systems.
Many vehicles have a control module for the automatic transmission called a transmission control module (TCM). The engine control module (ECM) communicates with the TCM to monitor the automatic transmission for faults. If the TCM detects a fault in the automatic transmission and sets a transmission related fault code, the ECM is informed of this also and sets a P0700 in the ECM memory.
DTC P0700 - Transmission Control System Malfunction
Circuit Description for Allison Automatic Transmission This diagnostic trouble code (DTC) indicates that a related transmission DTC set in the transmission control module (TCM) . The engine control module (ECM) receives the TCM DTC information over the serial data circuit. The ECM turns ON the malfunction indicator lamp (MIL) when the TCM sends a message over the serial data circuit requesting MIL illumination.
DTC P0700 is a type A DTC. This diagnostic procedure supports the following DTC: DTC P0700 Transmission Control Module (TCM) Requested MIL Illumination
Conditions for Running the DTC: The engine is running.
Conditions for Setting the DTC: The ECM receives a serial data message from the TCM, in order to illuminate the MIL.
Action Taken When the DTC Sets: - The control module illuminates the MIL when the diagnostic runs and fails. - The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.
Conditions for Clearing the DTC (click image for zoom)...
The control modul turns OFF the MIL after 3 consecutive ignition cycles that the diagnostic runs and does not fail. A current DTC, Last Test Failed, clears when the diagnostic runs and passes. A scan tool can clear the code from TCM history. The TCM automatically clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without failure.
1. Verify power and ground supplies to the TCM when the vehicle is cold. 2. If OK, depending on ambient temperature. If ambient temperature is high and the problem will not show, remove the TCM and place it in a freezer for a couple of hours. 3. If the ambient temperature is low remove the TCM to a warm area for a couple of hours. 4. After sufficiently cold or warm, install the TCM and drive the vehicle immediately. 5. If the ambient temperature is low and the transmission now shifts or the ambient temperature is high and the transmission will not shift replace the TCM.
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P1611 = MIL request signal circuit
low inputMIL-on Request
This code is set when the MIL On Request from the TCM (Transmission Control Module) has/had a problem getting the information to the ECU (Engine Control Module). In the 98 Elantra, there are two separate computer modules; one for the engine, the other for the transmission. (both located under the dash Driver's side. The diagnostic procedure specifies the wiring between the ECM & TCM be checked for any damage/defects. If none found, then replace the TCM with a new one to see if the problem (code) occurs again. If communication between TCM & ECM is corrected, you should have a ****** code related to the MIL On Request from the TCM (****** codes begin with P07 w/the next two digits (??) identifying the specific transmission component/malfunction).
You can also Go to www.hmaservice.com and register your vehicle by VIN #.. you'll then have access to wiring diagrams, shop & owner manuals, service bulletins, campaigns, illustrations and procedures, etc
The Engine Control Module (ECM) receives two vehicle speed sensor signals via the Control Area Network (CAN) communication line. One is sent from Vehicle Dynamic Control (VDC) / Traction Control System (TCS) / Anti-Lock Brake System (ABS) control unit, and the other is from Transmission Control Module (TCM). ECMuses these two signals for engine control.Possible Causes:- VDC/TCS/ABS to ECM circuit harness is open or shorted - TCM to ECM circuit harness is open or shorted - VDC/TCS/ABS to ECM circuit connectors - TCM to ECM circuit connectors - Faulty revolution sensor