P1643

A : P1643: CAN NETWORK MALFUNCTION, ECM

G354462t40 : CHECK THE ECM FOR DAMAGE
1. Inspect the ECM.

- Does the ECM indicate any signs of damage?

-> Yes
Please check part is not on any form of prior authorization before replacement.

-> No

G354462t41 : CHECK CAN + FOR SHORT CIRCUIT TO GROUND
1. Measure the resistance between the diagnostic connector, pin 06, (Y) and GROUND.

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t42 : CHECK CAN + FOR SHORT CIRCUIT TO BATTERY
1. Measure the resistance between the diagnostic connector, pin 06, (Y) and pin 16 (OY).

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t43 : CHECK CAN - FOR SHORT CIRCUIT TO GROUND
1. Measure the resistance between the diagnostic connector, pin 14 (G) and GROUND.

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t44 : CHECK CAN - FOR SHORT CIRCUIT TO BATTERY
1. Measure the resistance between the diagnostic connector, pins 14 (G) and 16 (OY).

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t45 : CHECK FOR SHORT CIRCUIT BETWEEN CAN + AND CAN -
1. Measure the resistance between the diagnostic connector, pins 06 (Y) and 14 (G).

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t46 : CHECK FOR OPEN CIRCUIT ON CAN + BETWEEN THE DIAGNOSTIC CONNECTOR AND THE ECM

1. Disconnect the battery negative terminal.

- Is the resistance greater than 5 ohms?

-> Yes
REPAIR the high resistance circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t47 : CHECK FOR OPEN CIRCUIT ON CAN - BETWEEN THE DIAGNOSTIC CONNECTOR AND THE ECM
1. To test:

- Is the resistance greater than 5 ohms?

-> Yes
REPAIR the high resistance circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t48 : CHECK FOR CORRECT BUS TERMINATION
1. Reconnect the ECM connector.
2. Measure the resistance between the diagnostic connector, pins 06 (Y) and 14 (G).

- Is the resistance between 50 and 70 ohms?

-> Yes
Please check part is not on any form of prior authorization before replacement.

-> No

G354462t49 : CHECK CONTINUITY OF THE CAN + CIRCUIT
1. To test:

- Is the resistance greater than 5 ohms?

-> Yes
REPAIR the high resistance circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t50 : CHECK CONTINUITY OF THE CAN - CIRCUIT
1. Measure the resistance between:

- Is the resistance greater than 5 ohms?

-> Yes
REPAIR the high resistance circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t51 : CHECK FOR LOSS OF TERMINATION WITHIN THE ECM
1. Measure the resistance between:

- Is the resistance between 110 and 140 ohms?

-> Yes

-> No
Please check part is not on any form of prior authorization before replacement.

G354462t52 : CHECK FOR LOSS OF TERMINATION WITHIN THE IC
1. Measure the resistance between pins 17 and 18 of the IC.

- Is the resistance between 110 and 140 ohms?

-> Yes
Possible intermittent fault. Recheck DTCs.

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