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Acceleration Control: Diagnosis Jaguar S-type I рестайлинг

Fuel System 3 illustrations ~2303 words

Pinpoint Test A: DTC P1240, P1241, P1242

Pinpoint Test A

A1 CHECK THE POWER SUPPLY TO THE ACCELERATOR PEDAL DEMAND SENSOR
  1. TURN the ignition switch to the RUN position.
  2. Measure the voltage between electrical connector CA88 pin 5 (Y) and ground.
  3. Measure the voltage between electrical connector CA88 pin 2 (Y) and ground.
Is the voltage less than 4.5 volts?
YES Go to step 2 .. → A2
NO DIAGNOSE the electronic engine control system. For additional information, refer to «Electronic Engine Controls»(ref-311293) or «Electronic Engine Controls»(ref-311294) .
A2 CHECK CONTINUITY OF THE ACCELERATOR PEDAL DEMAND SENSOR POWER SUPPLY CIRCUIT
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the ECM electrical connector PI 1 and the accelerator pedal electrical connector CA 88.
  3. Measure the resistance between PI 1 pin 13 (Y) and CA88 pin 5 (Y).
  4. Measure the resistance between PI 1 pin 12 (OY) and CA88 pin 2 (OY).
Is the resistance less than 5 ohms?
YES Go to step 3 .. → A3
NO REPAIR the power supply circuit from the ECM to the accelerator pedal. CLEAR the DTC. TEST the system for normal operation.
A3 CHECK THE ACCELERATOR PEDAL DEMAND SENSOR POWER SUPPLY FOR A SHORT CIRCUIT TO GROUND
  1. Measure the resistance between CA88 pin 5 (Y) and ground.
  2. Measure the resistance between CA88 pin 2 (OY) and ground.
Is the resistance greater than 10,000 ohms?
YES DIAGNOSE the electronic engine control system. For additional information, refer to «Electronic Engine Controls»(ref-311293) or «Electronic Engine Controls»(ref-311294) .
NO REPAIR the power supply circuit from the ECM to the accelerator pedal. CLEAR the DTC. TEST the system for normal operation.

Pinpoint Test B: DTC P1122, P1123, P1215, P1216, P1344

Pinpoint Test B

B1 CHECK THE ACCELERATOR PEDAL DEMAND SENSOR OUTPUT
  1. Turn the ignition switch to the RUN position.
  2. Measure the voltage between electrical connector CA88 pin 1 (O) and ground with the accelerator pedal released and with the accelerator pedal at full throttle.
  3. Measure the voltage between electrical connector CA88 pin 4 (B) and ground with the accelerator pedal released and with the accelerator pedal at full throttle.
Does the voltage vary between 0.75 volts and 3.5 volts?
YES Go to step 4 .. → B4
NO Go to step 2 .. → 2
B2 CARRY OUT AN ACCELERATOR PEDAL POSITION SENSOR COMPONENT CHECK
  1. Remove the accelerator pedal. For additional information, refer to «Accelerator Pedal - Removal and Installation»(ref-311335-S36933381662009032500000) .
  2. Measure the resistance between pin 1 and pin 6 of the accelerator pedal.
  3. Measure the resistance between pin 4 and pin 5 of the accelerator pedal.
Is the resistance between pin 1 and pin 6 between 546 and 1134 ohms, and between pin 4 and pin 5 between 975 and 2025 ohms?
YES Go to step 3 .. → B3
NO INSTALL a new accelerator pedal. For additional information, refer to «Accelerator Pedal - Removal and Installation»(ref-311335-S36933381662009032500000) . CLEAR the DTC. TEST the system for normal operation.
B3 CHECK THE ACCELERATOR PEDAL DEMAND SENSOR CIRCUIT FOR A SHORT TO GROUND
  1. Disconnect the ECM electrical connector PI 1.
  2. Measure the resistance between electrical connector CA 88 pin 1 (O) and ground.
  3. Measure the resistance between electrical connector CA88 pin 4 (B) and ground.
Is the resistance greater than 10,000 ohms?
YES Go to step 4 .. → B4
NO REPAIR the accelerator pedal demand sensor circuit from the ECM to the accelerator pedal. CLEAR the DTC. TEST the system for normal operation.
B4 CHECK THE ACCELERATOR PEDAL DEMAND SENSOR CIRCUIT FOR OPEN CIRCUIT
  1. Disconnect the ECM electrical connector PI 1 and the accelerator pedal electrical connector CA 88.
  2. Measure the resistance between PI 1 pin 103 (O) and CA 88 pin 1 (O).
  3. Measure the resistance between PI 1 pin 102 (B) and CA 88 pin 4 (B).
Is the resistance less than 5 ohms?
YES DIAGNOSE the electronic engine control system. For additional information, refer to «Electronic Engine Controls»(ref-311293) or «Electronic Engine Controls»(ref-311294) .
NO REPAIR the accelerator pedal demand sensor circuit from the ECM to the accelerator pedal. CLEAR the DTC. TEST the system for normal operation.

Pinpoint Test C: DTC P0121, P0122, P0123

Pinpoint Test C

C1 CHECK THE POWER SUPPLY TO THE THROTTLE POSITION SENSOR
  1. Turn the ignition switch the to the RUN position.
  2. Measure the voltage between the throttle position sensor electrical connector PI 26 pin 4 (OY) and ground.
Is the voltage less than 4.5 volts?
YES Go to step 2 .. → C2
NO Go to step 4 .. → 4
C2 CHECK THE THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the ECM electrical connector PI 1 and the throttle position sensor electrical connector PI 26.
  3. Measure the resistance between PI 1 pin 12 (OY) and PI 26 pin 4 (OY).
Is the resistance less than 5 ohms?
YES Go to step 3 .. → C3
NO REPAIR the throttle position sensor power supply circuit from the ECM to the throttle position sensor. CLEAR the DTC. TEST the system for normal operation.
C3 CHECK THE THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT FOR A SHORT TO GROUND
  1. Measure the resistance between PI 26-pin 4 (OY) and ground.
Is the resistance greater than 10,000 ohms?
YES DIAGNOSE the electronic engine control system. For additional information, refer to «Electronic Engine Controls»(ref-311293) or «Electronic Engine Controls»(ref-311294) .
NO REPAIR the throttle position sensor power supply circuit from the ECM to the throttle position sensor. CLEAR the DTC. TEST the system for normal operation.
C4 CHECK THE THROTTLE POSITION SENSOR GROUND CIRCUIT
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the throttle position sensor electrical connector PI 26.
  3. Measure the resistance between PI 26 pin 1 (BG) and ground.
Is the resistance less than 5 ohms?
YES Go to step 6 .. → C6
NO Go to step 5 .. → 5
C5 CHECK THE THROTTLE POSITION SENSOR GROUND WIRE FOR OPEN CIRCUIT
  1. Disconnect the ECM electrical connector PI I and the throttle position sensor electrical connector PI 26.
  2. Measure the resistance between PI 26 pin 1 (BG) and PI 1 pin 19 (BG).
Is the resistance less than 5 ohms?
YES Go to step 6 .. → C6
NO REPAIR the throttle position sensor ground circuit from the ECM to the throttle position sensor. CLEAR the DTC. TEST the system for normal operation.
C6 CHECK THE THROTTLE POSITION SENSOR
  1. Measure the resistance between PI 26 pin 2 and PI 26 pin 4.
  2. Measure the resistance between PI 26 pin 3 and PI 26 pin 4.
Are the resistor values the same?
YES Go to step 7 .. → C7
NO INSTALL a new throttle body. For additional information refer to «Electronic Engine Controls»(ref-311293) or «Electronic Engine Controls»(ref-311294) .
C7 CHECK CONTINUITY OF THE THROTTLE POSITION SENSOR OUTPUT CIRCUIT
  1. Measure the resistance between PI 1 pin 75 (R) and PI 26 pin 3 (R).
  2. Measure the resistance between PI 1 pin 76 (Y) and PI 26 pin 2 (Y).
Is the resistance less than 5 ohms?
YES Go to step 8 .. → C8
NO REPAIR the circuit from the ECM to the throttle position sensor. CLEAR the DTC. TEST the system for normal operation.
C8 CHECK THE THROTTLE POSITION SENSOR OUTPUT CIRCUIT FOR A SHORT TO GROUND
  1. Measure the resistance between PI 26 pin 3 (R) and ground.
  2. Measure the resistance between PI 26 pin 2 (Y) and ground.
Is the resistance greater than 10,000 ohms?
YES DIAGNOSE the electronic engine control system. For additional information, refer to «Electronic Engine Controls»(ref-311293) or «Electronic Engine Controls»(ref-311294) .
NO REPAIR the circuit from the ECM to the throttle position sensor. CLEAR the DTC. TEST the system for normal operation.

Pinpoint Test D: DTC P1251, P1658, P1631, P1657

Pinpoint Test D

D1 CHECK THE THROTTLE MOTOR RELAY
  1. Turn the ignition switch to the RUN position.
Does the throttle relay make an audible click?
YES Go to step 2 .. → D2
NO Go to step 7 .. → 7
D2 CHECK THE ECM POWER SUPPLY FROM THE THROTTLE MOTOR RELAY
  1. Measure the voltage between the throttle motor relay connector FH 32D pin 5 (NR) and ground.
Is the voltage greater than 10 volts?
YES Go to step 3 .. → D3
NO Go to step 4 .. → 4
D3 CHECK CONTINUITY OF THE ECM POWER SUPPLY WIRE FROM THE THROTTLE MOTOR RELAY
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the ECM electrical connector PI 1 and remove the throttle motor relay.
  3. Measure the resistance between the throttle motor relay electrical connector FH 32D pin 5 (NR) and the ECM electrical connector PI 1 pin 134 (GU).
Is the resistance less than 5 ohms?
YES DIAGNOSE the electronic engine control system. For additional information, refer to «Electronic Engine Controls»(ref-311293) or «Electronic Engine Controls»(ref-311294) .
NO REPAIR the ECM power supply wire from the throttle motor relay. CLEAR the DTC. TEST the system for normal operation.
D4 CHECK FUSE 18 IN THE FRONT POWER DISTRIBUTION BOX (FPDB).
  1. Check the fuse.
Is the fuse OK?
YES Go to step 5 .. → D5
NO Go to step 6 .. → 6
D5 CHECK THE THROTTLE MOTOR RELAY POWER SUPPLY CIRCUIT
  1. Remove the throttle motor relay.
  2. Measure the voltage between the throttle motor relay connector FH 32D pin 3 (YR) and ground.
Is the voltage less than 10 volts?
YES REPAIR the throttle motor relay power supply circuit. CLEAR the DTC. TEST the system for normal operation.
NO INSTALL a new throttle motor relay. CLEAR the DTC. TEST the system for normal operation.
D6 CHECK FUSE 18 FOR A SHORT TO GROUND
  1. Measure the resistance between fuse 18 and ground.
Is the resistance greater than 10,000 ohms?
YES INSTALL a new fuse. CLEAR the DTC. TEST the system for normal operation.
NO REPAIR short to ground between engine compartment fuse box and the throttle motor relay. INSTALL a new fuse. CLEAR the DTC. TEST the system for normal operation.
D7 CHECK THE POWER SUPPLY CIRCUIT TO THE THROTTLE MOTOR RELAY COIL
  1. Turn the ignition switch to the RUN position.
  2. Measure the voltage between the throttle motor relay connector FH 32D pin 1 (GR) and ground.
Is the voltage greater than 10 volts?
YES Go to step 8 . → D8
NO REPAIR the throttle motor relay coil power supply circuit from the engine compartment fuse box. CLEAR the DTC. TEST the system for normal operation.
D8 CHECK CONTINUITY OF THE THROTTLE MOTOR RELAY COIL
  1. Remove the throttle motor relay (if not already removed).
  2. Measure the resistance between terminal 1 and terminal 2 of the throttle motor relay.
Is the resistance between 70 and 90 ohms?
YES Go to step 9 .. → D9
NO INSTALL a new throttle motor relay. CLEAR the DTC. TEST the system for normal operation.
D9 CHECK CONTINUITY OF THE THROTTLE MOTOR RELAY GROUND CIRCUIT
  1. Disconnect the ECM electrical connector PI 1.
  2. Measure the resistance between the throttle motor relay electrical connector FH 32D pin 2 (GR) and the ECM electrical connector PI 1 pin 52 (GR).
Is the resistance less than 5 ohms?
YES DIAGNOSE the electronic engine control system. For additional information, refer to «Electronic Engine Controls»(ref-311293) or «Electronic Engine Controls»(ref-311294) .
NO REPAIR the throttle motor relay ground circuit from the ECM to the engine compartment fuse box. CLEAR the DTC. TEST the system for normal operation.

Pinpoint Test E: DTC P1243

Pinpoint Test E

E1 CHECK THE ACCELERATOR PEDAL DEMAND SENSOR GROUND CIRCUIT
  1. Disconnect the ECM electrical connector PI 1 and the accelerator pedal electrical connector CA 88.
  2. Measure the resistance between PI 1 pin 19 (BG) and CA 88 pin 6 (BG).
  3. Measure the resistance between PI 1 pin 20 (BG) and CA 88 pin 3 (BG).
Is the resistance less than 5 ohms?
YES DIAGNOSE the electronic engine control system. For additional information, refer to «Electronic Engine Controls»(ref-311293) or «Electronic Engine Controls»(ref-311294) .
NO REPAIR the accelerator pedal demand sensor ground circuit from the accelerator pedal to the ECM. CLEAR the DTC. TEST the system for normal operation.

Scheme 295

Scheme 295: Removal
Scheme 295: Removal

Scheme 296

Scheme 296
Scheme 296

Scheme 297

Scheme 297
Scheme 297
  1. Remove the driver side instrument panel lower panel.
  2. Disconnect the accelerator pedal electrical connector.
  3. Remove the accelerator pedal. Remove the accelerator pedal retaining screws. Remove the accelerator pedal.

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