2006 toyota innova diesel engine- instrument cluster no read out when temperature is cold

Did you by chance check for DTC'S diagnostic trouble codes?

Instrument Cluster Diagnostic Trouble Code (DTC) Index DTC Description Source Action B1255 Air Temperature External Sensor Circuit Open Instrument cluster Go To Pinpoint Test E . B1257 Air Temperature External Sensor Circuit Short to Ground Instrument cluster Go To Pinpoint Test E . B2097 Compass Module Failure Instrument cluster Go To Pinpoint Test B . U2013 Compass Module - No Response Instrument cluster Go To Pinpoint Test B . All Other DTCs - Instrument cluster REFER to Section 419-10 .

If you are having a problem with the fuel gauge and temperature gauge on your Toyota Hilux 2KD, there could be several possible causes. Some potential reasons for this issue include:

• A faulty or damaged cluster: The cluster is the instrument panel on your vehicle that houses the gauges and displays important information such as the fuel level and engine temperature. If the cluster is faulty or damaged, it may not be able to accurately display the readings from the gauges.
• A faulty or damaged fuel level sensor: The fuel level sensor is responsible for measuring the amount of fuel in the tank and sending that information to the cluster. If the sensor is faulty or damaged, it may not be able to accurately measure the fuel level and the gauge may not display the correct reading.
• A faulty or damaged temperature sensor: The temperature sensor is responsible for measuring the engine temperature and sending that information to the cluster. If the sensor is faulty or damaged, it may not be able to accurately measure the temperature and the gauge may not display the correct reading.

In order to diagnose and fix the problem, it is recommended to have the vehicle assessed by a qualified mechanic. They will be able to diagnose the specific cause of the issue and recommend the appropriate repair. It is important to address any issues with the gauges on your vehicle promptly, as they can affect the safety and performance of your vehicle.

Main fuse 120amps

Could be the gauge also , which means the instrument cluster would have to be repaced . Rather then playing around with the coolant temp sensor an wiring diagrams , have it checked for code's . Your vehicle has a cylinder head temp sensor .(CHT)
Principles of Operation
The Expedition and Navigator instrument clusters are configurable, hybrid electronic clusters (HEC) that contain a microprocessor, gauges, indicator lamps, and internal circuitry. The instrument cluster is non-repairable at the dealership level with the exception of the warning indicator bulbs on the Expedition only and the instrument cluster lens on both the Expedition and Navigator clusters. The instrument cluster utilizes hardwired circuitry, the standard corporate protocol (SCP), and universal asynchronous receiver-transmitter (UART)-based protocol (UBP) communication networks. Communication using the SCP network transmits and receives data between the instrument cluster, the powertrain control module (PCM), and the anti-lock brake system/traction control/integrated vehicle dynamics (ABS/TC/IVD) module. Communication using the UBP network utilizes data transmitted and received by the instrument cluster and the four-wheel drive control module, power liftgate module (Navigator only), parking aid module, air suspension module, vehicle security module, driver seat module and the electronic air temperature control (EATC). For additional information regarding the SCP and UBP communication networks, refer to Section 418-00 .
It is very important to understand:

• where the input originates from.
• all the information necessary in order for a feature to operate.
• which module(s) receive(s) the input or command message.
• Does the module which received the input control the output of the feature, or does it output a message over the SCP or UBP network to another module?
• which module controls the output of the feature.
• Temperature Gauge
  The PCM receives the engine coolant temperature status through hardwired circuitry to the engine coolant temperature (ECT) sensor. The instrument cluster receives the engine coolant temperature data from the PCM through the SCP communication network. The instrument cluster microprocessor monitors the engine coolant temperature data received from the PCM and commands the temperature gauge indication with a corresponding movement of the pointer.

• Incorrect temperature gauge indication

• Circuitry.
• Cylinder head temperature sensor.
• Powertrain control module (PCM).
• Instrument cluster.

• Go To Pinpoint Test E .

Your best bet , take it to a qualified repair shop . You have no idea of the electronic's involved here .


PINPOINT TEST E: INCORRECT TEMPERATURE GAUGE INDICATION Test Step Result / Action to Take E1 RETRIEVE THE RECORDED DTCS FROM BOTH CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER SELF-TESTS

• Use the recorded instrument cluster DTCs from the continuous and on-demand self-tests.
• Are any instrument cluster DTCs recorded?

Yes
If instrument cluster DTC U1073 is retrieved, REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual to continue diagnosis.

For all other instrument cluster DTCs REFER to the Instrument Cluster Diagnostic Trouble Code (DTC) Index.

No
GO to E2 . E2 CARRY OUT THE COOLANT TEMPERATURE GAUGE ACTIVE COMMAND USING THE DIAGNOSTIC TOOL

• Connect the diagnostic tool.
• Key in ON position.
• Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
• Select the instrument cluster engine coolant active command.
• Trigger the engine coolant active command. Scroll in three increments 0%, 50% and 100%.
• Did the temperature gauge start at cold when at 0%, move to half at 50% and full hot at 100%?

Yes
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual to continue diagnosis.

No
GO to E3 . E3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

• Disconnect all instrument cluster connectors.
• Check for:
  • corrosion
  • pushed-out pins
• Connect all instrument cluster connectors and make sure they seat correctly.
• Operate the system and verify the concern is still present.
• Is the concern still present?

Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. TEST the system for normal operation.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

Has CHT - cylinder head temp. sensor . This sensor is a input to the PCM - engine computer . The PCM sends engine temp info on serial data network to the instrument cluster . I/C has a microprocessor inside . Have it check for DTC'S - diagnostic trouble codes . Not OBD2 codes , B - body codes . The gauge could be the problem , which means replacing the instrument cluster .
Engine coolant temperature information is received by the instrument cluster from the PCM over the SCP network. Temperatures over 121°C (275°F) will display hot (H). If the engine coolant temperature data is missing or invalid for five seconds, the instrument cluster will move the engine coolant temperature gauge below the cold (C) position.
The best way to diagnose this is with a scan tool , factory or a professional type . Know how the system works and not replacing parts is the proper way to diagnose .
U1073 D073 SCP (J1850) Invalid or Missing Data for Engine Coolant PCM CARRY OUT the PCM self-test.

• A single gauge does not return to zero with the ignition switch off

• Instrument cluster.

• INSTALL a new instrument cluster; REFER to Instrument Cluster . TEST the system for normal operation.

• Incorrect temperature gauge indication

• Circuitry.
• Instrument cluster.
• PCM.
• Engine coolant temperature sensor.

• GO to Pinpoint Test F .

I should also point out that if the temp sensor were bad the vehicle may not run right .
Using the factory scan tool
Trigger instrument cluster active command ENGCOOLNT. Monitor the engine coolant temperature gauge while adjusting the ENGCOOLNT active command to read 50% and 100%.

• Does the temperature gauge start at cold, move to half at 50%, and full hot at 100%?

Yes REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No INSTALL a new instrument cluster; REFER to Instrument Cluster . REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
Your best bet , take it to a qualified repair shop !

One advantage us dealer tech's have over a week end warrior is that we have factory service repair information and have factory scan tool ,Tech 2 , to check data coming into the instrument cluster . Most of you probably don't even think about how that coolant temp infor shows up on the gauge , except by a coolant sensor !

High Temperature Indicator
The high temperature Indicator function handles the control of the Engine Temperature Gauge Display and the red High Temperature indicator. The Powertrain Control Module (PCM) reads the Coolant Temperature Sensor, filters the messages, and sends the coolant temperature to the instrument cluster via a Class 2 serial data message. The PCM monitors the coolant sensor in order to determine a fault. The PCM transmits the Class 2 serial data coolant temperature report messages to the instrument cluster for the temperature gauge display and for the high temperature indicator control.
The instrument cluster receives the engine temperature data in the Class 2 serial data message from the PCM. The instrument cluster converts this data into a temperature gauge pointer position which drives the gauge pointer. The instrument cluster also uses this data in order to determine the high temperature indicator control.
The Body Control Module (BCM) looks for the high temperature indicator Class 2 serial data report from the instrument cluster and triggers a chime when the indicator is ON.

Your best bet , take it to a qualified repair shop , rather then just replacing parts .

Depending on the year there isn't any . All done by computer on serial data bus communication network. The coolant temp. is supplied to the engine computer By a ETC - engine coolant temp sensor . All the modules on the vehicle ( ABS , air bags , BCM , instrument cluster , RKE module etc... ) Share info on this data bus network . If the gauge isn't working probably bad ,If a communication network problem the gauge will default to fixed temp degree . This is for a 1999 Buick , out of factory service repair manual . But all vehicles are pretty much the same .
Engine Coolant Temperature Gauge
The Powertrain Control Module (PCM) via the class II serial data line to the instrument cluster, broadcasts the coolant temperature. The instrument cluster compares the temperature data using a 16 point look-up table in order to determine the needle deflection. A smooth filter is used in order to secure a continuous response. The instrument cluster drives the temperature gauge to C (cold) under the following conditions:
• The temperature data is lost.
• The PCM is in a state of health fault.

Is your temperature gauge also faulty? I've read that it could be the voltage regulator in the instrument cluster. Can't confirm.

The temperature gauge is actually a needle that read a range of Hot/Cold on the dash instrument cluster. If you are referring to the coolant temperature sensor, the location depends on the engine size. Post the engine size and we'll answer it better.

it sounds like you are getting a surge of voltage from your alternator/generator. Very strange.

the dealer can run a diagnostic test & pull fault codes or you can try this. If this helps, please report back & rate as fixya. Thanks. I am curious what you find as root cause. Good luck.

Instrument Cluster Self-Diagnostic Mode
To enter the instrument cluster self diagnostic mode with the engine off, depress and hold the odometer reset button. Turn the ignition switch to the RUN position and hold until the gauges sweep (within five to eight seconds). Depress the reset button once to advance to each stage of the self-test.
Turn the ignition to the OFF position to exit the instrument cluster self-diagnostic mode. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics.


Instrument Cluster Self-Diagnostic Mode Odometer display Description GAGE Carries out gauge sweep of all gauges, then displays the present gauge values. Also carries out the check sum test on ROM and EEPROM. All segments illuminated. Illuminates all odometer segments. bulb Illuminates all micro-controlled lamps and LEDs. r #### Returns to normal operation of all micro-controlled lamps and LEDs and displays hexadecimal value for ROM level (used when requesting assistance from the hotline). nr#### Displays hexidecimal ROM level and type as stored in non-volatile memory (NVM). EE ## Displays hexadecimal value for EE level (used when requesting assistance from the hotline). dt #### Displays hexadecimal code for the final manufacturing date. ###C Gas engines display last temperature gauge input value from SCP, temperature gauge will indicate present temperature. Diesel engine displays present temperature analog/digital input in decimal as a ratio, temperature gauge will indicate present temperature. dtc #### Displays a 16 bit DTC in hexidecimal format. DTCs displayed are those detected in continuous operation not during self-test. EnG Displays English speed value being input, speedometer will indicate present speed. m Displays metric speed value being input, speedometer will indicate present speed. tAc Displays the tachometer value being input to the instrument cluster. Tachometer will indicate present rpm. FUEL Displays the present analog/digital fuel level being input to the instrument cluster as a ratio. OIL Displays the last analog/digital reading of the oil pressure switch contact resistance, oil gauge will indicate present level. br Displays the brake fluid level in an analog/digital ratio value. bAt ##.# Displays present battery analog/digital voltage. rhEo Displays present hexadecimal pulse width modulation (PWM) dimming input. rhi, rhS, rho Alternating 1 second display of pulse width modulation (PWM) input duty cycle, SCP hexidecimal dimming step, output driver counts in hexadecimal. Cr RUN/START sense circuit check. PA, Pb, PC, and Pd Displays 8-bit hexadecimal value for the Port A, B, C, and D readings (used when requesting information from the hotline). PE0-PE7 Displays 8-bit hexadecimal value for the Port E0-Port E7 in analog/digital readings