P1642

A : P1642; E523: THE MODULE DOES NOT RESPOND TO THE JAGUAR APPROVED DIAGNOSTIC TESTER - ECM

G195523t40 : CHECK ECM FOR DAMAGE
1. Disconnect the ECM.
2. INSPECT the ECM.

- Does the ECM indicate any signs of damage?

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

-> No

G195523t41 : CHECK CAN + FOR SHORT CIRCUIT TO GROUND
1. Reconnect the ECM electrical connector PI001.
2. Turn the ignition switch to the OFF position.
3. Disconnect the battery negative terminal.
4. Measure the resistance between the diagnostic connector FC001 pin 006, (Y) and GROUND.

- Is the resistance less than 5 ohms?

-> Yes
REPAIR the CAN + circuit. CLEAR the DTC. TEST the system for normal operation.

-> No

G195523t42 : CHECK CAN + FOR SHORT CIRCUIT TO BATTERY
1. Turn the ignition switch to the OFF position.
2. Disconnect the battery negative terminal.
3. Measure the resistance between the diagnostic connector FC001 pin 006, (Y) and pin 016, BATTERY.

- Is the resistance less than 5 ohms?

-> Yes
REPAIR the CAN + circuit. CLEAR the DTC. TEST the system for normal operation.

-> No

G195523t43 : CHECK CAN - FOR SHORT CIRCUIT TO GROUND
1. Turn the ignition switch to the OFF position.
2. Disconnect the battery negative terminal.
3. Measure the resistance between the diagnostic connector FC001 pin 014 (G) and GROUND.

- Is the resistance less than 5 ohms?

-> Yes
REPAIR the CAN - circuit. CLEAR the DTC. TEST the system for normal operation.

-> No

G195523t44 : CHECK CAN - FOR SHORT CIRCUIT TO BATTERY
1. Turn the ignition switch to the OFF position.
2. Measure the resistance between the diagnostic connector FC001 pin 014 (G) and pin 016, BATTERY.

- Is the resistance less than 5 ohms?

-> Yes
REPAIR the CAN - circuit. CLEAR the DTC. TEST the system for normal operation.

-> No

G195523t45 : CHECK FOR SHORT CIRCUIT BETWEEN CAN + AND CAN -
1. Turn the ignition switch to the OFF position.
2. Disconnect the battery negative terminal.
3. Measure the resistance between the diagnostic connector FC001 pins 006 (Y) and 014 (G).

- Is the resistance less than 5 ohms?

-> Yes
REPAIR the CAN - and CAN + circuits. CLEAR the DTC. TEST the system for normal operation.

-> No

G195523t46 : CHECK FOR OPEN CIRCUIT ON CAN + BETWEEN DIAGNOSTIC CONNECTOR AND THE ECM
1. Turn the ignition switch to the OFF position.
2. Disconnect the battery negative terminal.
3. Disconnect the ECM electrical connector, PI001.
4. Measure the resistance between FC001 pin 006 (Y) and PI001, pin 124 (Y).

- Is the resistance less than 5 ohms?

-> Yes

-> No
REPAIR the CAN + circuit. CLEAR the DTC. TEST the system for normal operation.

G195523t47 : CHECK FOR OPEN CIRCUIT ON CAN - BETWEEN DIAGNOSTIC CONNECTOR AND THE ECM
1. Turn the ignition switch to the OFF position.
2. Disconnect the battery negative terminal.
3. Measure the resistance between FC001 pin 014 (G) and PI001, pin 123 (G).

- Is the resistance less than 5 ohms?

-> Yes

-> No
REPAIR the CAN - circuit. CLEAR the DTC. TEST the system for normal operation.

G195523t48 : CHECK FOR CORRECT BUS TERMINATION
1. Turn the ignition switch to the OFF position.
2. Disconnect the battery negative terminal.
3. Reconnect the ECM electrical connector, PI001.
4. Measure the resistance between the diagnostic connector FC001, pins 006 (Y) and 014 (G).

- Is the resistance between 50 and 70 ohms?

-> Yes
INSTALL a new ECM. CLEAR the DTC. TEST the system for normal operation. Before replacing a ECM, contact Dealer technical support.

-> No

G195523t49 : CHECK CONTINUITY OF THE CAN + CIRCUIT
1. Turn the ignition switch to the OFF position.
2. Disconnect the battery negative terminal.
3. Disconnect the ECM electrical connector, PI001, and the IP connector, FC015.
4. Measure the resistance between PI001, pin 124 (Y) and FC015, pin 018 (Y).

- Is the resistance less than 5 ohms?

-> Yes

-> No
REPAIR the CAN + circuit between PI001, pin 124 and FC015, pin 018. CLEAR the DTC. TEST the system for normal operation.

G195523t50 : CHECK CONTINUITY OF THE CAN - CIRCUIT
1. Turn the ignition switch to the OFF position.
2. Disconnect the battery negative terminal.
3. Measure the resistance between PI001, pin 123 (G) and FC015, pin 019 (G).

- Is the resistance less than 5 ohms?

-> Yes

-> No
REPAIR the CAN + circuit between PI001, pin 123 and FC015, pin 019. CLEAR the DTC. TEST the system for normal operation.

G195523t51 : CHECK FOR LOSS OF TERMINATION WITHIN THE ECM
1. Turn the ignition switch to the OFF position.
2. Disconnect the battery negative terminal.
3. Measure the resistance between pins 123 and 124 of the ECM.

- Is the resistance between 100 and 140 ohms?

-> Yes

-> No
INSTALL a new ECM. CLEAR the DTC. TEST the system for normal operation. Before replacing a ECM, contact Dealer technical support.

G195523t52 : CHECK FOR LOSS OF TERMINATION WITHIN THE INSTRUMENT CLUSTER
1. Turn the ignition switch to the OFF position.
2. Disconnect the battery negative terminal.
3. Measure the resistance between pins 018 and 019 of the instrument cluster.

- Is the resistance between 100 and 140 ohms?

-> Yes
Possible intermittent fault. Recheck DTCs.

-> No
INSTALL a new instrument cluster. CLEAR the DTC. TEST the system for normal operation.