Pinpoint Test I: DTC U0140:87

Tire Pressure Monitoring System

Pinpoint Tests

Pinpoint Test I: DTC U0140:87

Normal Operation
- DTC U0140:87 (Lost Communication With Body Control Module: Missing Message) - This DTC is set by the Tire Pressure Monitor (TPM) module in continuous memory if data messages received from the BCM are missing.

This pinpoint test is intended to diagnose the following:


- Communication network concern
- BCM

PINPOINT TEST I: DTC U0140:87

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I1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.
- Verify there is an observable symptom present.
- Is an observable symptom present?

Yes
GO to I2.

No
The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

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I2 CHECK THE COMMUNICATION NETWORK

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Does the BCM pass the network test?

Yes
GO to I3.

No
REFER to Module Communications Network Testing and Inspection to diagnose no communication with the BCM.

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I3 RETRIEVE THE RECORDED DTCs FROM THE BCM SELF-TEST

- Check for recorded DTCs from the BCM self-test.
- Are any DTCs present?

Yes
REFER to Multifunction Electronic Modules Multifunction Electronic Modules.

No
GO to I4.

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I4 RECHECK THE TPM MODULE DTCs

- Clear the TPM module DTCs.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Repeat the TPM module self-test.
- Is DTC U0140:87 present?

Yes
GO to I5.

No
The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

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I5 CHECK FOR DTC U0140 OR U0140:00 SET IN OTHER MODULES

- Clear continuous DTCs from all modules.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Enter the following diagnostic mode on the scan tool: Self-Test.
- Retrieve the continuous memory DTCs from all modules.
- Is DTC U0140 set in the Driver Seat Module (DSM) or DTC U0140:00 set in the IPC?

Yes
INSTALL a new BCM. REFER to Multifunction Electronic Modules Service and Repair. CLEAR all continuous DTCs. REPEAT the self-test.

No
INSTALL a new TPM module. TEST the system for normal operation.

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