Toyota CH-R Service Manual: Engine Coolant Temperature Receiver Gauge Malfunction
DESCRIPTION
In this circuit, the combination meter assembly receives engine coolant temperature signals from the ECM via CAN communication. The combination meter assembly displays the engine coolant temperature that is calculated based on the data received from the ECM.
WIRING DIAGRAM
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CAUTION / NOTICE / HINT
NOTICE:
- Before replacing the ECM, refer to Registration.
w/ Smart Key System: Click here
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w/o Smart Key System: Click here
- When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
HINT:
If there is an open or short in the engine coolant temperature sensor circuit, the ECM stores DTCs. Troubleshoot the SFI system.
- w/ Canister Pump Module: Click here
- w/o Canister Pump Module: Click here
PROCEDURE
|
1. |
CHECK FOR DTC (METER / GAUGE SYSTEM) |
(a) Check if meter / gauge system DTCs are output.
Click here
|
Result |
Proceed to |
|---|---|
|
Meter / gauge system DTCs are not output. |
A |
|
Meter / gauge system DTCs are output. |
B |
| B | .gif) |
GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
.gif)
|
2. |
CHECK FOR DTC (SFI SYSTEM) |
(a) Check if SFI system DTCs are output.
- w/ Canister Pump Module:
Click here
- w/o Canister Pump Module:
Click here
|
Result |
Proceed to |
|---|---|
|
DTCs are not output. |
A |
|
SFI system DTCs are output. (w/o Canister Pump Module) |
B |
|
SFI system DTCs are output. (w/ Canister Pump Module) |
C |
| B | |
GO TO DIAGNOSTIC TROUBLE CODE CHART |
| C | |
GO TO SFI SYSTEM |
|
|
3. |
PERFORM ACTIVE TEST USING TECHSTREAM (ENGINE SPEED, ENGINE RPM) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus:
(1) for Engine: Powertrain / Engine / Data List.
(2) for Combination Meter: Body Electrical / Combination Meter / Data List.
(e) Read the Data List according to the display on the Techstream.
(1) Engine and ECT.
Powertrain > Engine and ECT > Data List|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Coolant Temp |
Engine coolant temperature |
Min.: -40°C (-40°F), Max.: 140°C (284°F) |
75 to 100°C (167 to 212°F): After warming up engine |
This is the engine coolant temperature.
|
|
Tester Display |
|---|
|
Coolant Temp |
(2) Combination Meter.
Body Electrical > Combination Meter > Data List|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Coolant Temperature |
Engine coolant temperature |
Min.: 0°C (0°F), Max.: 127.5°C (261.5°F) |
75 to 100°C (167 to 212°F): After warming up engine |
- |
|
Tester Display |
|---|
|
Coolant Temperature |
|
Result |
Proceed to |
|---|---|
|
The Data List values of the ECUs do not match |
A |
|
The Data List values of the ECUs match |
B |
HINT:
- When the Data List values of the ECUs match, an internal malfunction of the ECM is suspected.
- When the Data List values of the ECUs do not match, a signal output malfunction of the ECM or an internal malfunction of the combination meter assembly is suspected.
| A | |
REPLACE ECM |
| B | |
REPLACE COMBINATION METER ASSEMBLY |
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PRECAUTION
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HINT:
The type of ignition switch used on this model differs according to the specifications
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Expression
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HINT:
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NOTICE:
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Toyota CH-R Owners Manual
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