For code 693, follow directions below.
Disconnect ECU connector CRS202 and measure voltage between socket 60 or 79 and B(-).
Is battery voltage present?
YES: Disconnect battery and proceed to Step 2.
NO: Inspect ECU power circuits 005-A and 005-B for open or short.
2. Measure resistance between CRS202, socket 81 and B(-).
Is resistance = 1 ohm?
YES: Connect battery and proceed to CAUSE B.
NO: Inspect ground circuit 126-Z and 126-E for open, short, or source of excessive resistance
Measure voltage between the ECU connector CRS202, socket 14 and B(-).
Is CAN HI voltage approximately 2.5 Vdc?
YES: Proceed to Step 2.
NO: Inspect CAN HI circuit for open or short. If voltage is 0 volts, the CAN HI circuit is shorted to ground or
open. If voltage is above 5 volts, the CAN HI circuit is shorted to power.
2. Measure voltage between the ECU connector CRS202, socket 15 and B(-).
Is CAN LO voltage approximately 2.5 Vdc?
YES: Disconnect battery and proceed to Step 3.
NO: Inspect CAN LO circuit for open or short. If voltage is 0 volts, the CAN LO circuit is shorted to ground or
open. If voltage is above 5 volts, the CAN LO circuit is shorted to power.
3. Measure resistance between the ECU connector CRS202, socket 14 and socket 15.
Is resistance 60 ± 6 ohms?
YES: No communication faults are present, connect battery and proceed to CAUSE C.
NO: If resistance is 120 ohms, the CANbus has an open circuit or a missing or damaged termination resistor.
If resistance is 0 ohms, the CANbus circuits are shorted together.