U1400-IMPLAUSIBLE TPS SIGNAL RECEIVED

For a complete wiring diagram Refer to Section 8W.

Theory of Operation

The Transmission Control Module (TCM) receives two throttle position related signals over the CAN Bus. One is the throttle pedal position and the other is a throttle pedal position toggle bit. When the Toggle signal pattern is out of range from a predefined signal pattern a DTC will set.

When Monitored:
Ignition on with no Lost Communication with ECM/PCM DTCs present.
Set Condition:
When the throttle pedal position toggle signal pattern is out of range from a predefined signal pattern for the period of 1 second.

Possible Causes

FCM/TIPM CAN BUS DTCS PRESENT

ECM/PCM DTCS PRESENT

ECM/PCM

TRANSMISSION CONTROL MODULE

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 or is the STARTS SINCE SET counter 2 or less?

Yes

Go To 2

Go To 4

2. CHECK FOR FCM/TIPM CAN BUS DTCS

With the scan tool, read FCM/TIPM DTCs.

Are there any FCM/TIPM CAN BUS DTCs present?

Yes

(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) category and perform the appropriate symptom(s).
Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

Go To 3

3. CHECK IF ECM/PCM DTCS ARE PRESENT

With the scan tool, read engine DTCs.

Are there any engine DTCs present?

Yes

(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) category and perform the appropriate symptom(s).
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

The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle the wires while checking for shorted and open circuits.

Were there any problems found?

Yes

Repair as necessary.

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

Test Complete.