Home › Drivetrain › Automatic Transmission/Transaxle › AB60F AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSMISSION SYSTEM
Last Modified: 11-27-2007 1.6 C
Service Category: Drivetrain Section: Automatic Transmission/Transaxle
Model Year: 2008 Model: LX570 Doc ID: RM0000012UV00ZX
Title: AB60F AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSMISSION SYSTEM: DESCRIPTION (2008 LX570)

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.

DTC Code

DTC Detection Condition

Trouble Area

P0818

The signal indicating that the transfer is in neutral remains on while the vehicle is running under the following conditions for 30 sec. (2 trip detection logic):

  • The vehicle speed is 25 km/h (16 mph) or more.
  • The transfer position switch is in H4.
  • Short in transfer neutral signal
  • Transfer shift actuator assembly (transfer system)
  • ECM

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 "H4" 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

Related DTCs

P0818: Transfer neutral position switch/Verify switch cycling

Required sensors/Components

Transfer shift actuator assembly, Vehicle speed sensor

Frequency of operation

Continuous

Duration

30 sec.

MIL operation

2 driving cycles

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored

None

Vehicle speed

25 km/h (15.54 mph) or more

Transfer position

High

Battery voltage

8 V or higher

Engine switch

On (IG)

Starter

OFF

TYPICAL MALFUNCTION THRESHOLDS

Transfer neutral signal

ON

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

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

(a) Disconnect the C44 transfer shift actuator assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C44-3 (N) - Body ground

Always

10 kΩ or higher
OK

3.

CHECK HARNESS AND CONNECTOR (FOUR WHEEL DRIVE CONTROL ECU - BODY GROUND)

(a) Disconnect the A27 four wheel drive control ECU connector.



(b) Disconnect the C44 transfer shift actuator assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A27-16 (NP) - Body ground

Always

10 kΩ or higher
OK

5.

CHECK HARNESS AND CONNECTOR (TRANSFER SHIFT ACTUATOR ASSEMBLY, FOUR WHEEL DRIVE CONTROL ECU - ECM)

(a) Disconnect the A38 ECM connector.



(b) Disconnect the C44 transfer shift actuator assembly connector.

(c) Disconnect the A27 four wheel drive control ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A38-5 (TFN) - Body ground

Always

10 kΩ or higher
OK