P1679-CALIBRATION NOT LEARNED

For a complete wiring diagram Refer to Section 8W.

Theory of Operation

The first time the vehicle is started, the Transmission Control Module (TCM) receives hydraulic calibration data from an external EEPROM (located in the transmission) and stores this information in the EEPROM of the TCM. If there is no stored hydraulic calibration stored in the TCM this DTC will set. It takes one failure to turn on the MIL.

When Monitored:
Ignition on with a system voltage between 9.0 and 16.0 volts.
Set Condition:
The TCM is unable to read the hydraulic calibration data stored in the TCM EEPROM for the period of 5.0 seconds.

Possible Causes

OTHER TRANSMISSION DTCS PRESENT

TRANSMISSION RELEARN PERFORMED

TRANSMISSION CONTROL MODULE

CV TRANSMISSION REPLACED

Always perform the CVT Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

Diagnostic Test

1. CHECK IF THE DTC IS ACTIVE

With the scan tool, read Transmission DTCs.

Is the status Active for this DTC?

Yes

Go To 2

Go To 4

2. CHECK FOR OTHER DTCS

With the scan tool, read Transmission DTCs.

Is the DTC U1146-LOST COMMUNICATION WITH EXTERNAL MEMORY also present?

Yes

Refer to the Transmission Diagnosis and Testing category and perform diagnostics for U1146-LOST COMMUNICATION WITH EXTERNAL MEMORY.

Go To 3

3. CHECK THE TCM

Has the Transmission Control Module (TCM), the CV Transmission been replaced, or a Transmission relearn procedure been performed?

Yes

Cycle the ignition off for 5 seconds and then back on. Erase the DTC and cycle the ignition again. If the DTC still remains active, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Bulletins for possible causes that may apply. If no problems are found, replace the TCM per the Service Information.

Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Bulletins for possible causes that may apply. If no problems are found, replace the TCM per the Service Information.
Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

4. INTERMITTENT WIRING AND CONNECTORS

If the DTC is not active, erase the DTC and perform the CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

Did the DTC P1679-CALIBRATION NOT LEARNED reset?

Yes

Go To 2

Test Complete.