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Engine Controls - Self-Diagnostics - with Codes: Other Land Rover Discovery II

Testing & Diagnostics ~1000 words

REPAIR PROCEDURE

CAUTIONWhenever possible backprobe connector terminals to protect them from damage.

Begin all repairs by retrieving Diagnostic Trouble Codes (DTCs) and confirming customer complaint. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION (BOSCH) table in SELF-DIAGNOSTICS - INTRODUCTION article. After repairs are completed, allow engine to cool and perform specified repair confirmation drive cycle. See REPAIR CONFIRMATION DRIVE CYCLE .

RELIEVING FUEL PRESSURE

Fuel pressure can be relieved at fuel feed fitting at fuel rail. Position cloth around fitting to catch fuel spray. Using 2 wrenches, loosen fitting. On Range Rover, tighten fuel feed fitting to 12 ft. lbs. (16 N.m). On Discovery Series II, tighten fuel feed fitting to 84 INCH lbs. (9.5 N.m).

REPAIR CONFIRMATION DRIVE CYCLE

CAUTIONDuring repair confirmation drive cycle it is important to pick a route that is prudent for specified vehicle speeds, and for stop and go driving. Ensure weather and traffic conditions will not impede required conditions of repair confirmation drive cycle.

Note. It is important to follow each instruction for each repair confirmation drive cycle. Failure to perform each instruction under conditions and time period specified may require repeating confirmation test drive. Before turning ignition switch to OFF position at completion of confirmation test drive, recheck for any Diagnostic Trouble Codes (DTCs) using Land Rover TestBook or OBD-II scan tool.

Repair Confirmation Drive Cycle "A"

  1. After completing DTC and/or complaint repairs, allow engine to cool. Install Land Rover TestBook or OBD-II scan tool. Turn ignition on for 30 seconds. Ensure Engine Coolant Temperature (ECT) sensor indicates less than 140°F (60°C).
  2. Start engine and allow to idle for 2 minutes. Check for DTCs using Land Rover TestBook or OBD-II scan tool. If any DTC is indicated, perform specified repairs. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION (BOSCH) table in SELF-DIAGNOSTICS - INTRODUCTION article. If no DTCs are indicated, repair is complete.

Repair Confirmation Drive Cycle "B"

  1. After completing DTC and/or complaint repairs allow engine to cool. Install Land Rover TestBook or OBD-II scan tool. Turn ignition on for 30 seconds. Ensure Engine Coolant Temperature (ECT) sensor indicates less than 140°F (60°C).
  2. Start engine and allow to idle for 2 minutes. Perform 2 light accelerations from zero to 35 MPH using light pedal pressure and slow to a stop. Perform 2 medium accelerations from zero to 45 MPH using moderate pedal pressure and slow to a stop. Perform 2 hard accelerations from zero to 55 MPH using heavy pedal pressure and slow to a stop.
  3. Allow engine to idle for 2 minutes. Check for DTCs using Land Rover TestBook or OBD-II scan tool. If any DTC is indicated, perform specified repairs. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION (BOSCH) table in SELF-DIAGNOSTICS - INTRODUCTION article. If no DTCs are indicated, repair is complete.

Repair Confirmation Drive Cycle "C"

  1. After completing DTC and/or complaint repairs allow engine to cool. Install Land Rover TestBook or OBD-II scan tool. Turn ignition on for 30 seconds. Ensure Engine Coolant Temperature (ECT) sensor indicates less than 140°F (60°C).
  2. Start engine and allow to idle for 2 minutes. Perform 2 light accelerations from zero to 35 MPH using light pedal pressure and slow to a stop. Perform 2 medium accelerations from zero to 45 MPH using moderate pedal pressure and slow to a stop. Perform 2 hard accelerations from zero to 55 MPH using heavy pedal pressure. When second acceleration cycle is completed, increase vehicle speed to 60 MPH and cruise for 8 minutes. Reduce speed to 50 MPH, continue cruising for another 3 minutes and slow to a stop.
  3. Allow engine to idle for 3 minutes. Check for DTCs using Land Rover TestBook or OBD-II scan tool. If any DTC is indicated, perform specified repairs. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION (BOSCH) table in SELF-DIAGNOSTICS - INTRODUCTION article. If no DTCs are indicated, repair is complete.
  4. The following areas have an associated readiness test which must be confirmed as complete, before a problem resolution can be verified: Catalytic converter fault. Evaporative loss system fault. HO2S sensor fault. HO2S sensor heater fault. When carrying out Confirmation Drive Cycle "C" to determine a fault in any of the above areas, select the TestBook readiness test icon to verify that the test has been confirmed as complete.

Repair Confirmation Drive Cycle "D"

Note. The final phase of Repair Confirmation Drive Cycle: "D" requires that a flat, straight route be chosen that allows a vehicle speed of 35 MPH to be maintained without stopping or excessive pedal pressure.

  1. After completing DTC and complaint repairs allow engine to cool. Install Land Rover TestBook or OBD-II scan tool. Turn ignition on for 30 seconds. Ensure Engine Coolant Temperature (ECT) sensor indicates less than 95°F (35°C).
  2. Start engine and allow to idle for 2 minutes. Perform 2 light accelerations from zero to 35 MPH using light pedal pressure and slow to a stop. Perform 2 medium accelerations from zero to 45 MPH using moderate pedal pressure and slow to a stop. Perform 2 hard accelerations from zero to 55 MPH using heavy pedal pressure. Increase speed to 60 MPH and cruise for 5 minutes. Reduce speed to 50 MPH, continue to cruise for 5 minutes. Reduce speed to 35 MPH, continue to cruise for 5 minutes and slow to a stop.
  3. Allow engine to idle for 2 minutes. Check for DTCs using Land Rover TestBook or OBD-II scan tool. If any DTC is indicated, perform specified repairs. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION (BOSCH) table in SELF-DIAGNOSTICS - INTRODUCTION article. If no DTCs are indicated, repair is complete.

Repair Confirmation Drive Cycle "E"

Note. While performing REPAIR CONFIRMATION DRIVE CYCLE "E" ensure engine does not overheat. DO NOT turn ignition off until after check for DTCs is completed.

  1. After completing DTC and/or complaint repairs, allow engine to cool. Install Land Rover TestBook or OBD-II scan tool. Ensure Engine Coolant Temperature (ECT) sensor indicates less than 140°F (60°C). Ensure fuel tank is more than a quarter full.
  2. Start engine and allow to idle undisturbed for 20 minutes. DO NOT turn ignition off. Check for DTCs using Land Rover TestBook or OBD-II scan tool. If any DTC is indicated, perform specified repairs. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION (BOSCH) table in SELF-DIAGNOSTICS - INTRODUCTION article. If no DTCs are indicated, repair is complete.

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