P0818

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

DESCRIPTION

The ECM detects the signal from the No. 2 transfer indicator switch (Transfer neutral position switch).

This DTC indicates that the No. 2 transfer indicator switch remains ON.





MONITOR DESCRIPTION

The ECM detects whether or not the transfer high and low shift lever is in neutral by monitoring the signal from the No. 2 transfer indicator switch.

If the ECM detects that the transfer high and low shift lever is in neutral under the following conditions, the ECM will conclude that there is a malfunction of the No. 2 transfer indicator switch:

- No. 2 transfer indicator switch indicates that the transfer high and low shift lever is in neutral.

- Transfer high and low shift lever is in the H position.

- The vehicle is traveling at 25.1 km/h (15.6 mph) or more.

- The No. 2 transfer indicator switch has been ON for more than 30 seconds.

If all of the above conditions are detected, the ECM will conclude that there is a malfunction of the No. 2 transfer indicator switch, illuminate the MIL and store the DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (NO. 2 TRANSFER INDICATOR SWITCH - BODY GROUND)

(a) Disconnect the E78 ECM connector.

(b) Disconnect the B41 No. 2 transfer indicator switch connector.





(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (COMBINATION METER - BODY GROUND)
OK -- Continue to next step.

2. INSPECT NO. 2 TRANSFER INDICATOR SWITCH (TRANSFER NEUTRAL POSITION SWITCH)

(a) Remove the No. 2 transfer indicator switch.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPLACE NO. 2 TRANSFER INDICATOR SWITCH (TRANSFER NEUTRAL POSITION SWITCH) Disassembly

OK -- REPLACE ECM Removal

3. CHECK HARNESS AND CONNECTOR (COMBINATION METER - BODY GROUND)

(a) Disconnect the E14 combination meter connector.

(b) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE COMBINATION METER Removal