Fuel Pump Driver Module DTC Help Text Update (SSM75392)

Publication date: 2021-05-05
Reference number: SSM75392

FUEL PUMP DRIVER MODULE DTC HELP TEXT UPDATE

TECHNICAL SERVICE BULLETIN

Reference Number(s): SSM75392, Date of Issue: May 17, 2021

LAND ROVER:	Discovery/L462; Range Rover/L405; Range Rover Sport/L494; Range Rover Velar/L560
SERVICE CATEGORY:	Engine
SYMPTOM:	404000 Fuel System Concerns

ATTACHMENTS

SSM Attachment P341251 FPDMv21.pdf (SSM Attachment P341251 FPDMv21.pdf)

CONTENT

ISSUE

JLR is investigating Fuel Pump Driver Module (FPDM) replacements relating to P1338-38 FPDM Communication Circuit Signal frequency incorrect logged in the Powertrain Control Module (PCM)

CAUSE

Unknown at this time.

ACTION

Please follow the improved DTC help text below to aid diagnosis:

Carry out battery test as per TOPIx 414-01A and record the results
Referring to the wiring diagrams for the vehicle line presented locate the Pulse Width Modulation (PWM) signal wire on the FPDM from the Powertrain Control Module (PCM)
Setup Picoscope as per attached document and insert test probe into the PWM signal wire on the FPDM following TOPIx guidelines for harness diagnosis and testing
Start engine and idle
Record the Frequency and compare to the attached document Signal frequency specification of 127.5hz between 172.5 hz. Voltage should between 0 -12 V.
If the frequency at the FPDM matches the specification detailed in step 5 replace the FPDM
If the frequency does not match the specification detailed in step 5, carry out integrity checks on the wiring harness including pin drag test and repair as required
Using the Jaguar Land Rover approved diagnostic equipment, clear all stored DTCs and retest. Thank you in advance for your assistance with this matter.

Thank you in advance for your assistance with this matter.