Jaguar XJ (X350). Manual — part 774

GO to Pinpoint Test G187746t14.

G187746t14 : CHECK FOR AN OPEN CIRCUIT

1. Measure the resistance between the EGR valve electrical connector PI 15 pin 4 (YU) and ECM

electrical connector PI 1 pin 57 (YU).

Is the resistance more than 5.0 ohms?

-> Yes

REPAIR the circuit between EGR valve electrical connector PI 15 pin 4 (YU) and ECM electrical

connector PI 1 pin 57 (YU). CLEAR DTC. To validate fix drive vehicle between 30 mph (48 kph) and 40

mph (64 kph). Allow vehicle to idle for 2 minutes.

-> No

GO to Pinpoint Test G187746t15.

G187746t15 : CHECK FOR A SHORT TO GROUND

1. Measure the resistance between the EGR valve electrical connector PI 15 pin 1 (YG) and GROUND.

Is the resistance less than 10,000 ohms?

-> Yes

REPAIR the circuit between EGR valve electrical connector PI 15 pin 1 (YG) and ECM electrical

connector PI 1 pin 58 (YG). CLEAR DTC. To validate fix drive vehicle between 30 mph (48 kph) and 40

mph (64 kph). Allow vehicle to idle for 2 minutes.

-> No

GO to Pinpoint Test G187746t16.

G187746t16 : CHECK FOR AN OPEN CIRCUIT

1. Measure the resistance between the EGR valve electrical connector PI 15 pin 1 (YG) and ECM

electrical connector PI 1 pin 58 (YG).

Is the resistance more than 5.0 Ohms?

-> Yes

REPAIR the circuit between EGR valve electrical connector PI 15 pin 1 (YG) and ECM electrical

connector PI 1 pin 58 (YG). CLEAR DTC. To validate fix drive vehicle between 30 mph (48 kph) and 40

mph (64 kph). Allow vehicle to idle for 2 minutes.

-> No

GO to Pinpoint Test G187746t17.

G187746t17 : CHECK FOR A SHORT TO GROUND

1. Measure the resistance between the EGR valve electrical connector PI 15 pin 6 (YR) and GROUND.

Is the resistance less than 10,000 ohms?

-> Yes

REPAIR the circuit between EGR valve electrical connector PI 15 pin 6 (YR) and ECM electrical

connector PI 1 pin 59 (YR). CLEAR DTC. TEST the system for normal operation.

-> No

GO to Pinpoint Test G187746t18.

G187746t18 : CHECK FOR AN OPEN CIRCUIT

1. Measure the resistance between the EGR valve electrical connector PI 15 pin 6 (YR) and ECM

electrical connector PI 1 pin 59 (YR).

Is the resistance more than 5.0 Ohms?

-> Yes

REPAIR the circuit between EGR valve electrical connector PI 15 pin 6 (YR) and ECM electrical

connector PI 1 pin 59 (YR). CLEAR DTC. TEST the system for normal operation.

-> No

GO to Pinpoint Test G187746t22.

G187746t22 : CHECK FOR A SHORT TO GROUND

1. Measure the resistance between the EGR valve electrical connector PI 15 pin 3 (YU) and GROUND.

Is the resistance less than 10,000 ohms?

-> Yes

REPAIR the circuit between EGR valve electrical connector PI 15 pin 3 (YU) and ECM electrical

connector PI 1 pin 60 (YU). CLEAR DTC. TEST the system for normal operation.

-> No

GO to Pinpoint Test G187746t23.

G187746t23 : CHECK FOR AN OPEN CIRCUIT

1. Measure the resistance between the EGR valve electrical connector PI 15 pin 3 (Yu) and ECM

electrical connector PI 1 pin 60 (YU).

Is the resistance more than 5.0 Ohms?

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-> Yes

REPAIR the circuit between EGR valve electrical connector PI 15 pin 3 (YU) and ECM electrical

connector PI 1 pin 60 (YU). CLEAR DTC. TEST the system for normal operation.

-> No

INSTALL a new EGR valve. CLEAR DTC. TEST the system for normal operation. If DTC is repeated

INSTALL a new ECM. CLEAR DTC. TEST the system for normal operation.

Engine Emission Control - VIN Range:
G45704->G99999

Overview

There are changes to the engine management system (EMS) for 2006 my, the most obvious of which

will be the change to 7-digit diagnostic trouble codes (DTCs) from the familiar 5-digit, and the

introduction of secondary air injection.

For additional information on the operation of the emission control systems.

Engine Emission Control - VIN Range: G45704->G99999

Inspection and verification

1 . Verify the customer concern.

2 . Visually inspect for obvious signs of mechanical or electrical damage.

Mechanical

Electrical

Engine breather hoses

Cyclone separator

Exhaust gas recirculation (EGR) pipes (check for

cracks)

EGR valve

Fuses

Wiring harness

Loose or corroded electrical

connectors

Sensor(s)

Stepper motor(s)

Secondary air injection pump

Secondary air injection valve

Engine control module (ECM)

3 . If an obvious cause for an observed or reported concern is found, correct the cause (if possible)

before proceeding to the next step.

4 . If the cause is not visually evident use the Jaguar approved diagnostic system or a scan tool to

retrieve the fault codes before proceeding to the DTC Index.

Symptom Chart

Symptom

(general)

Symptom (specific)

Possible source

Action

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