Fault Code Nos.
Fault Code No.: 37-2 Diagnostic Code No.: 54
If fault code numbers "28" and "37" are both indicated, take the actions specified for fault code number
"28" first.
Do not remove the ISC (idle speed control) valve.
If fault code numbers "37" and "46" are both indicated, take the actions specified for fault code
number "46" first.
If fault code numbers "37" and "42" are both indicated, take the actions specified for fault code number
"42" first.
If fault code numbers "28" and "37" are both indicated, take the actions specified for fault code number
"28" first.
Do not remove the ISC (idle speed control) valve.
If fault code numbers "37" and "46" are both indicated, take the actions specified for fault code
number "46" first.
If fault code numbers "37" and "42" are both indicated, take the actions specified for fault code number
"42" first.
Item: Defective ISC (idle speed control) unit (ISC operating sound is not heard).
Fail-Safe System: Able to Start Engine | Able to Drive Vehicle
Actuation: Fully closes the ISC valve, and then opens the valve. This operation is performed 3 times and takes
approximately 4 seconds each time. The engine trouble warning light comes on during the operation.
approximately 4 seconds each time. The engine trouble warning light comes on during the operation.
Procedure: The ISC unit vibrates when the ISC valve operates.
Probable Cause of Confirmation of Service
Item Malfunction and Check Maintenance Job Completion
Item Malfunction and Check Maintenance Job Completion
1
|
Locate the malfunction.
|
Execute the diagnostic
mode. (Code No. 54). Fully closes the ISC (idle speed control) valve, and then fully opens the valve. |
If the ISC (Idle Speed Control) unit's operating sound is heard, go to item 2 for Fault Code 37-1 for the component other than
ISC (idle speed control) unit is defective. If however, the ISC unit's operating sound is not heard, then go to item 2. |
2
|
Connection of ISC (idle
speed control) coupler. Check the locking condition of the coupler. Disconnect the coupler and check the pins (bent or broken terminals and locking condition of the pins). |
Improperly connected.
Connect the coupler securely or replace the wire harness. |
Execute the diagnostic
mode. (Code No. 54). If the ISC operating sound is heard, then go to item 8 and delete the fault code. If however, the ISC operating sound is not heard, go to item 3. |
3
|
Connection of ECU coupler.
Check the locking condition of the coupler. Disconnect the coupler and check the pins (bent or broken terminals and locking condition of the pins). |
Improperly connected.
Connect the coupler securely or replace the wire harness. |
Execute the diagnostic
mode. (Code No. 54). If the ISC operating sound is heard, then go to item 8 and delete the fault code. If however, the ISC operating sound is not heard, go to item 4. |
4
|
Wire harness continuity.
|
Open or short circuit.
Replace the wire harness. Between ISC (idle speed control) coupler and ECU coupler. (Red/Green-Red/Green) (Pink/Blue-Pink/Blue) (White/Green-White/Green) (Brown-Brown) Between ISC (idle speed control) coupler and relay unit coupler. (Red/Black-Red/Black) (Red/Black-Red/Black) |
Execute the diagnostic
mode. (Code No. 54). If the ISC operating sound is heard, then go to item 8 and delete the fault code. If however, the ISC operating sound is not heard, go to item 5. |
5
|
Installed condition of ISC
(idle speed control). Check for looseness or pinching. |
Improperly installed ISC (idle speed control).
Reinstall the ISC (idle speed control). |
Execute the diagnostic
mode. (Code No. 54). If the ISC operating sound is heard, then go to item 8 and delete the fault code. If however, the ISC operating sound is not heard, go to item 6. |
6
|
ISC valve is not moving correctly.
|
Replace the throttle body assembly.
|
Execute the diagnostic
mode. (Code No. 54). If the ISC operating sound is heard, then go to item 8 and delete the fault code. If however, the ISC operating sound is not heard, go to item 7. |
7
|
Malfunction in ECU.
|
Replace the ECU.
|
8
|
Delete the fault code.
|
Start the engine and let it idle
for approximately 10 seconds. Check that the fault code number is not displayed. |
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