Pinpoint Test I: TPMS Indicator On Continuously From Key ON With No Related DTCs Present
Tire Pressure Monitoring System (TPMS)
Pinpoint Test I: TPMS (Tire Pressure Monitoring System) Indicator On Continuously From Key ON With No Related DTCs Present
Normal Operation
The TPMS (Tire Pressure Monitoring System) function compares each tire pressure sensor transmission against a low pressure limit. If the pressure falls below this limit, the Tire Pressure Monitor (TPM) /Vehicle Security Module (VSM) communicates this on the Medium Speed Controller Area Network (MS-CAN) to the Instrument Panel Cluster (IPC). The IPC (Instrument Panel Cluster) illuminates the TPMS (Tire Pressure Monitoring System) indicator.
This pinpoint test is intended to diagnose the following:
- Low tire pressure
- Spare tire in use
- Stuck TPMS (Tire Pressure Monitoring System) sensor
PINPOINT TEST I : TPMS (Tire Pressure Monitoring System) INDICATOR ON CONTINUOUSLY FROM KEY ON WITH NO TPMS (Tire Pressure Monitoring System) RELATED DTCs PRESENT IN THE TPM (Tire Pressure Monitor) /VSM (Vehicle Security Module)
I1 DETERMINE TPMS (Tire Pressure Monitoring System) SYSTEM STATUS (TP_STAT) PID
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: VSM (Vehicle Security Module) DataLogger.
- Read and record the TP_STAT PID.
Is the TPMS (Tire Pressure Monitoring System) system status LOW?
Yes
GO to I2.
No
IF TP_STAT = SENSOR FAULT, GO to Pinpoint Test J Pinpoint Test J: DTC B2872.
IF TP_STAT = SYSTEM FAULT, GO to Pinpoint Test K Pinpoint Test K: DTCs B2872, B287A.
IF TP_STAT = SYSTEM ACTIVE, the TPMS (Tire Pressure Monitoring System) system is working as designed at this time. If an issue was reported by the customer, REFER to the symptom chart Symptom Related Diagnostic Procedures.
I2 CHECK LOW PRESSURE DETECTED
NOTE: The spare tire is not programmable even if it is equipped with a TPMS (Tire Pressure Monitoring System) sensor. If a damaged road wheel is located in the trunk, the sensor may still be recognized by the TPM (Tire Pressure Monitor) /VSM (Vehicle Security Module) as low. Make sure the spare tire is not currently in use. To restore TPMS (Tire Pressure Monitoring System) functionality, repair the damaged road wheel and re-mount it to the vehicle.
- Check spare tire location.
Is the spare tire in use?
Yes
REPAIR and REMOUNT the wheel to the vehicle. REFER to Wheel and Tire Overhaul. ADJUST tire pressures to the required pressure as defined on the Vehicle Certification (VC) label located in the driver door jam.
No
GO to I3.
I3 CHECK FOR LOW TIRE PRESSURE
- Using the Digital Tire Gauge, measure and record the tire pressure in all 4 road tires.
- Adjust the pressure for those found to be below the specification listed on the VC (Vehicle Certification) label.
- Activate each sensor at least twice with the training tool or customer activation tool to make sure the module gets the latest tire pressure data. Refer to Tire Pressure Monitoring System (TPMS) Sensor Activation Tire Pressure Monitoring System (TPMS) Sensor Activation or drive the vehicle for at least 2 minutes above 32 km/h (20 mph) to clear the low pressure warning. Do not train the sensors at this time.
Has the TPMS (Tire Pressure Monitoring System) indicator gone out?
Yes
The system is functioning normally. INFORM the customer that correct tire pressure maintenance is a customer responsibility and the details are provided in the Owner's Literature.
No
GO to I4.
I4 CHECK FOR STUCK TPMS (Tire Pressure Monitoring System) SENSOR
- Read and record the following PIDs:
- LF_PRES
- RF_PRES
- LR_PRES
- RR_PRES
- Using the Digital Tire Gauge, measure the actual tire pressures.
- Compare the tire pressure PIDs with the actual tire pressures.
Do the compared tire pressure values match within ± 5 psi and has the TPMS (Tire Pressure Monitoring System) indicator gone out?
Yes
The system is functioning normally.
No
INSTALL a new TPMS (Tire Pressure Monitoring System) sensor(s). REFER to Tire Pressure Monitoring System (TPMS) Sensor Service and Repair.