ABS/Starting - Hard To Press Brake Pedal To Start Engine
No: JTB00197Issue: 1
Date: 20 MAY 2010
SECTION: 206
High Brake Pedal Effort Required to Start Engine
AFFECTED VEHICLE RANGE:
CONDITION SUMMARY:
Situation:
The brake pedal may require a high effort when attempting to start the engine; the engine may not start; or the DSC System Disabled warning message may be displayed in the message center. These symptoms may be accompanied by Diagnostic Trouble Code (DTC) C0044-28 stored. These may be caused by the brake light switch being incorrectly set accompanied with Anti-lock Brake System (ABS) Modulator pressure sensor zero offset drift.
NOTE:
Warranty returns analysis has shown that ABS Modulators are being changed for this issue; this is the wrong action to take.
Action:
In the event of a customer concern of the above, refer to the Repair Procedure outlined below to check for stored DTCs, verify the brake booster vacuum system, verify that the brake switch is adjusted correctly, and calibrate the ABS modulator pressure sensor.
PARTS:
No parts necessary
TOOLS:
IDS with latest IDS-DVD and Calibration File; first available on IDS-DVD120_V6.08 Calibration File 29 Jaguar-approved Midtronics Vehicle Power Supply
WARRANTY:
NOTE:
Repair procedures are under constant review, and therefore times are subject to change; those quoted here must be taken as guidance only. Always refer to DDW to obtain the latest repair time.
DDW requires the use of causal part numbers. Labor only claims must show the causal part number with a quantity of zero.
Normal warranty policy and procedures apply.
REPAIR PROCEDURE
READ AND CLEAR DIAGNOSTIC TROUBLE CODES
CAUTION:
Ensure all ignition 'ON' / ignition 'OFF' requests are carried out; failure to perform these steps may cause damage to control modules in the vehicle.
CAUTION:
A Jaguar-approved Midtronics Vehicle Power Supply must be connected to the vehicle battery during IDS diagnosis / module programming.
1. Connect a Jaguar-approved Midtronics Vehicle Power Supply to the vehicle battery.
NOTE:
IDS must be loaded with IDS-DVD120_V6.08 or later and Calibration File 29 or later.
2. Connect the Integrated Diagnostic System (IDS) to the vehicle and begin a new Symptom Driven Diagnostics (SDD) session.
3. Follow the on-screen prompts, allowing SDD to read the VIN and identify the vehicle.
4. From the Session type screen, select 'Diagnosis'.
5. Select the Selected Symptoms tab and choose a fault-related symptom(s).
6. Select 'Continue'.
7. Check for stored DTCs in the Related Events and Unrelated Events tabs; record all DTCs.
8. Choose the Recommendations tab.
9. Run the Complete vehicle - clear all stored diagnostic trouble codes candidate to clear all DTCs.
VERIFY INTEGRITY OF BRAKE BOOSTER VACUUM SYSTEM
NOTE:
Global Technical Reference (GTR) lookup sequence is as follows:
GTR Home > NAS > X150-XK > Service Information> Model Year > Workshop Manual
1. Refer to Workshop Manual (GTR) section 206-00, Brake System - General In formation, and verify the integrity of the brake booster vacuum system (Pinpoint Test G545069t25: CHECK VACUUM).
VERIFY BRAKE LIGHT SWITCH ADJUSTMENT
1. Remove the brake light switch:
^ Twist the switch 1/8th of a turn.
^ Pull switch out.
2. Install the brake light switch:
^ Push the switch in.
^ Twist the switch 1/8th of a turn.
CALIBRATE THE ANTI-LOCK BRAKE MODULATOR PRESSURE SENSOR
1. From the SDD Session Type selection screen, choose Service Function
2. Select the 'Selected Symptoms' tab.
3. Select 'Chassis'.
4. Select 'Continue'.
5. Select 'Run' from the 'Brake system - Pressure sensor calibration' candidate.
^ Follow all on-screen instructions to complete this task.
6. Exit the current session.
7. Disconnect the IDS and the Midtronics Vehicle Power Supply from the vehicle.
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