Land Rover Defender 1999 Td5 Electrical Library Rover Manual
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DESCRIPTION AND OPERATION DEFENDER 1999 MY4.7 DIAGNOSTIC SOCKET DESCRIPTION The diagnostic socket is located under the cubby box. The socket is constructed to ISO standard and allows attachment of TestBook or any other ISO standard scantool. The diagnostic socket allows diagnostic information from the Anti-lock Braking System (ABS) ECU, the alarm ECU, or the Engine Control Module (ECM) to be retrieved. OPERATION Feed from the battery positive terminal is connected to fusible link 5 of the engine compartment fuse box (C0632-1) by a brown wire. Fusible link 5 (C0570-2) is connected to fuse 8 of the passenger compartment fuse box (C0580-15) by a brown/white wire. Fuse 8 of the passenger compartment fuse box (C0580-16) then provides a battery feed to the diagnostic socket (C0040-16) on a purple wire. Two earth paths are provided for the socket (C0040-4 & C0040-5), both on black wires. To allow TestBook to retrieve diagnostic information from the various control units on Defender 1999 MY, the diagnostic socket is connected in the following way; ·The diagnostic socket (C0040-7) to the ABS ECU (C0504-5) on a pink wire. ·The diagnostic socket (C0040-7) to the ECM (C0658-18) on a pink wire. ·The diagnostic socket (C0040-8) to the alarm ECU (C0061-17) on an orange/light green wire.
DESCRIPTION AND OPERATION 4.8 DEFENDER 1999 MY STARTING AND CHARGING - Td5 DESCRIPTION The charging system consists of an alternator containing a rectifier pack and regulator to maintain a constant direct (dc) voltage in the system. The alternator is belt driven from the crankshaft and is cooled by a fan mounted behind the pulley. The alternator has a fixed coil wound stator in which a field coil rotor rotates. Slip rings conduct current to and from the field coils via 2 carbon brushes. The regulator senses output voltage and controls this to approximately 14 volts. OPERATION - STARTING With the ignition switch in position II (C0094-1), the Engine Control Module (C0158-29) provides a feed to the glow plug relay coil (C0215-4) on a green/blue wire. This feed energises the glow plug relay, and enables a battery feed from fusible link 1 (C0622-1) to flow across the relay switch (C0215-1 & C0215-3). The glow plug relay can now supply a feed to all four glow plugs on a yellow/black wire. NOTE: The Td5 engine only has glow plugs in cylinders 1, 2, 3, and 4. Glow plug pre-heat and post-heat times are determined by engine coolant temperature. See Engine Management. When the ignition switch is turned to the crank position, (C0090-1), current flows from the switch to the starter relay coil (C0151-4) on a white/red wire. The earth path for the relay (C0151-6) is controlled by the alarm ECU (C0057-10) on a black/orange wire. See Anti-theft Alarm. With the starter relay energised, a battery feed from fusible link 5 of the passenger compartment fuse box (C0570-2) can flow across the relay switch (C0151-2 & C0151-8) to the starter motor (C0179-1) on a brown/red wire. This feed energises the starter solenoid, and allows a feed from the positive battery terminal to power the start motor (C0178-1). The starter motor is earthed via its fixings.
DESCRIPTION AND OPERATION DEFENDER 1999 MY4.9 OPERATION - CHARGING The battery positive terminal provides a feed to fusible link 1 and fusible link 5 of the engine compartment fuse box (C0632-1) on a brown wire. Both are connected in parallel. Fusible link 5 (C0570-2) provides a feed to both the starter relay (C0151-2) and the ignition switch (C0028-1) on brown/white wires. With the ignition switch in position II (C0094-1), current flows to fuse 6 and fuse 7 of the passenger compartment fuse box (C0580-9) on a white wire. Fuse 6 (C0580-12) supplies an ignition feed to the alternator (C0226-2) on a green/yellow wire. This feed protects the alternator should a wiring fault occur. Fuse 7 (C0580-14) supplies an ignition feed to the ignition/no charge warning lamp (C0233-16) on a white/green wire via header 285. The ignition/no charge warning lamp (C0233-17) is also connected to the alternator (C0226-1) on a yellow/brown then brown/yellow wire. This feed passes to earth via the brushes and regulator within the alternator, completing the ignition/no charge warning lamp circuit. The warning lamp will now illuminate. When the engine is started, the magnetized rotor turns within the stator windings, generating a 3 phase alternating current (ac), and a voltage that rises rapidly with rotor speed. The field diodes in the rectifier pack convert the ac current into dc current, flowing through the field windings. This causes an increase in the magnetic influence of the rotor, resulting in self-excitation of the alternator. The field current increases with rotor speed and thus increases the generated current and voltage until the alternator is fully excited.
DESCRIPTION AND OPERATION 4.10 DEFENDER 1999 MY When the voltage applied by the alternator to the ignition/no charge warning lamp equals that provided by fuse 7 of the passenger compartment fuse box the warning lamp is extinguished. This shows the alternator is producing battery charging current. When the battery is at a low state of charge or the current draw from the electrical functions of the vehicle causes a voltage drop, the alternator automatically charges at its maximum rate (dependant on rotor speed) until 14 volts is achieved. When demand drops, the current output is reduced. Battery charging is achieved on a brown wire from the alternator (C0183-1). This feed passes across the starter motor (C0178-1 & C0631-1) and back to the battery positive terminal (C0192-1) on a red wire.
DESCRIPTION AND OPERATION DEFENDER 1999 MY4.11 ENGINE MANAGEMENT - Td5 Refer to Workshop Manual for description and operation.
DESCRIPTION AND OPERATION 4.12 DEFENDER 1999 MY FUEL PUMP - Td5 DESCRIPTION The fuel pump is located above the fuel tank, and is controlled by the Engine Control Module (ECM). See ENGINE MANAGEMENT - Td5. OPERATION Feed from the battery positive terminal is connected to fuse 4 and fusible link 5 of the engine compartment fuse box (C0632-1) by a brown wire. Fusible link 5 (C0570-2) is connected to the ignition switch (C0028-1) by a brown/white wire. With the ignition switch in position II (C0094-1) current flows across the switch to fuse 5 of the passenger compartment fuse box (C0580-9) on a white wire. Fuse 5 (C0580-10) supplies an ignition feed to the ECM (C0658-33) on a white/green wire. The ECM provides a 12 volt signal to both sides of the fuel pump relay coil on brown/orange (C0730-4) and blue/purple (C0730-6) wires. As the potential difference across the relay coil is 0 volts, the relay remains de-energised. When the ECM receives the correct signal from the alarm ECU, it withdraws the feed on the blue/purple wire. The fuel pump relay is now energised. The energised fuel pump relay now allows a battery feed from fuse 4 of the engine compartment fuse box (C0573-1) on a purple/white wire to flow across the relay (C0730-8 & C0730-2). The relay can now supply a feed to the fuel pump (C0114-1) on a purple/white then white/purple wire. The pump is earthed (C0114-4) on a black wire.
DESCRIPTION AND OPERATION DEFENDER 1999 MY4.13 ANTI-LOCK BRAKING SYSTEM (ABS) - Td5 DESCRIPTION The Anti-lock Braking System (ABS) is controlled by the ABS ECU, located under the RH front seat. The system comprises of the ECU, ABS wheel speed sensors on each wheel, and an ABS modulator. OPERATION Feed from the battery positive terminal is connected to fusible link 1 and fusible link 5 of the engine compartment fuse box (C0632-1) on a brown wire. Fusible link 1 is wired in series with fuse 2, which supplies a continuous battery feed (C0573-3) to the ABS ECU (C00504-1) on a brown/white wire. Wired in parallel with fuse 2 is fusible link 4. Fusible link 4 (C0571-2) supplies a continuous battery feed to the ABS return pump relay (C0508-3) on a brown/white wire. At this stage, the relay is de-energised. A continuous battery feed is also supplied to the ignition switch. Fusible link 5 (0570-2) is connected to the ignition switch (C0028-1) by a brown/white wire. With the ignition switch in position II, current flows across the switch (C0094-1) to fuse 4 of the passenger compartment fuse box (C0580-1) on a white wire. Fuse 4 (C0580-8) supplies an ignition feed to the ABS ECU (C0504-2) on a green/orange wire. The ABS ECU is earthed (C0504-12) on a black wire.
DESCRIPTION AND OPERATION 4.14 DEFENDER 1999 MY ABS modulator and ECU The ABS ECU provides outputs to, and receives inputs from the ABS modulator as follows; ·Output from ABS ECU (C0506-1) to ABS modulator (C0501-1) to drive LH front outlet valve on a slate/white wire. ·Output from ABS ECU (C0506-2) to ABS modulator (C0501-2) to drive LH front inlet valve on a slate/red wire. ·Earth monitoring signal from ABS modulator (C09501-8) to ABS ECU (C0506-3) on a black wire. ·Output from ABS ECU (C0506-4) to ABS modulator (C0501-10) to drive RH front outlet valve on a slate/green wire. ·Output from ABS ECU (C0506-5) to ABS modulator (C0501-11) to drive RH front inlet valve on a slate/blue wire. ·Brake pedal input from ABS modulator (C0501-9) to ABS ECU (C0506-6) on a red/black wire. ·Output from ABS ECU (C0506-7) to ABS modulator (C0501-13) to drive LH rear outlet valve on a slate/yellow wire. ·Output from ABS ECU (C0506-8) to ABS modulator (C0501-12) to drive LH rear inlet valve on a slate/brown wire. ·Output from ABS ECU (C0506-10) to ABS modulator (C0501-5) to drive RH rear outlet valve on a slate/purple wire. ·Output from ABS ECU (C0506-11) to ABS modulator (C0501-4) to drive RH rear inlet valve on a slate/pink wire. The ABS ECU also interacts with the Engine Control Module (ECM). The ECM (C0658-32) provides the ABS ECU (C0504-10) with a throttle position signal on a slate/purple wire. The ECM (C0658-19) also provides the ABS ECU (C0504-11) with an engine speed signal on a yellow/pink wire. The ABS ECU can be interrogated using TestBook via the diagnostic connector. The diagnostic connector (C0040-7) is connected to the ABS ECU (C0504-5) by a pink wire. In the event of a failure, the ABS ECU (C0540-9) sends a feed to the brake fluid level warning lamp (C0230-14) on a black/white wire.
DESCRIPTION AND OPERATION DEFENDER 1999 MY4.15 Wheel speed sensors The ABS ECU also receives variable inputs from the four wheel speed sensors as follows; ·The LH front wheel speed sensor (C0516-1 & C0516-2) to the ABS ECU (C0505-1 & C0505-2 respectively) on a pair of white wires. ·The RH front wheel speed sensor (C0517-1 & C0517-2) to the ABS ECU (C0505-4 & C0505-5 respectively) on a pair of green wires. ·The LH rear wheel speed sensor (C0502-1 & C0502-2) to the ABS ECU (C0505-7 & C0505-8 respectively) on a pair of white wires. ·The RH rear wheel speed sensor (C0503-1 & C0503-2) to the ABS ECU (C0505-3 & C0505-6 respectively) on a pair of green wires. ABS return pump When the ABS functions operate, the ABS ECU (C0506-15) provides a feed to the ABS return pump relay (C0508-2) on a white/orange wire. The relay (C0508-4) is earthed on a black wire. This feed from the ABS ECU energises the relay, allowing the ignition feed to flow across the relay. The ABS return pump relay (C0508-1) provides a feed to the ABS return pump (C0507-1) on a brown/red wire. The pump (C0507-2) is earthed on a black wire. The ABS return pump relay also provides a feed to the ABS ECU (C0504-8) on a brown/red wire. The ECU uses this signal to monitor the operation of the ABS return pump.
DESCRIPTION AND OPERATION 4.16 DEFENDER 1999 MY Instrument pack The ABS ECU will inform the driver of any faults within the ABS or traction control systems (if fitted). The ABS ECU (C0504-9) supplies a feed to the brake fluid warning lamp (C0230-14) on a black/white wire if the level of fluid in the brake fluid reservoir reaches the minimum mark. The warning lamp (C0230-8) is earthed on a black wire. If the ABS ECU detects a fault within the ABS system, it supplies a feed (C0504-18) to the ABS warning lamp (C0230-7) on a red/slate wire. The warning lamp (C0230-8) is earthed on a black wire. If traction control is fitted, the ABS ECU (C0504-17) will illuminate the traction control warning lamp (C0230-16) by providing a feed on a yellow/slate wire if a fault is detected. The warning lamp (C0230-8) is earthed on a black wire.