P0818

A750F AUTOMATIC TRANSMISSION SYSTEM: P0818: Driveline Disconnect Switch Input Circuit

DTC P0818 - Driveline Disconnect Switch Input Circuit

DESCRIPTION

The ECM detects the signal indicating that the transfer is in neutral.
This DTC indicates that the signal indicating that the transfer is in neutral remains on.





MONITOR DESCRIPTION

The ECM detects whether or not the transfer is in neutral by monitoring the signal from the transfer shift actuator assembly.
If the ECM detects that the transfer is in neutral under the following conditions, the ECM will conclude that there is a malfunction of the transfer shift actuator assembly, illuminate the MIL and store the DTC:

- The transfer shift actuator assembly indicates that the transfer is in neutral.
- The transfer position switch is in the 4H position.
- The vehicle is being driven at 25 km/h (16 mph) or more.
- The transfer neutral signal has been ON for more than 30 seconds.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (TRANSFER SHIFT ACTUATOR - BODY GROUND)





(a) Disconnect the D68 transfer shift actuator connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





Result





B -- GO TO TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (4WD CONTROL ECU - BODY GROUND)
(a) Disconnect the A25 4WD control ECU connector.





(b) Disconnect the D68 transfer shift actuator connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





Result





B -- GO TO TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM
A -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (TRANSFER SHIFT ACTUATOR, 4WD CONTROL ECU - ECM)
(a) Disconnect the A24 ECM connector.





(b) Disconnect the D68 transfer shift actuator connector.
(c) Disconnect the A25 4WD control ECU connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:





Result





B -- REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- REPLACE ECM