P0877

U660E AUTOMATIC TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: P0877,P0878: Transmission Fluid Pressure Sensor / Switch "D" Circuit Low
P0878 - Transmission Fluid Pressure Sensor / Switch "D" Circuit High

DESCRIPTION

ATF pressure switch No. 2 is installed in the shift solenoid valve ATF output passage. This switch is used to identify the malfunctioning part when a fail-safe operation is performed. If the shift solenoid valve malfunctions when the ATF pressure switch has a malfunction, a fail-safe operation will be performed. This fail-safe operation is different from the fail-safe operation performed when the solenoid valve malfunctions and the ATF pressure switch is normal.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs DTC Check / Clear.

PROCEDURE

1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0877 OR P0878)

(a) Connect Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn Techstream on.

(c) Enter the following items: "Powertrain / ECT / Trouble Codes".

(d) Read the DTCs using Techstream.

Result:





HINT
If a solenoid is stuck OFF, DTCs for several solenoids including the malfunctioning solenoid will be detected.

C -- GO TO DTC CHART

B -- CHECK TRANSMISSION WIRE
A -- Continue to next step.

2. CHECK TRANSMISSION WIRE (SHORT TO GROUND)

(a) Remove the TCM.





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

Standard resistance:





OK -- REPAIR OR REPLACE TCM
NG -- Continue to next step.

3. CHECK ATF TEMPERATURE SENSOR ASSEMBLY (ATF PRESSURE SWITCH NO. 2)

(a) Disconnect the transmission wire connector from the ATF temperature sensor assembly.





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

Standard resistance:





NG -- REPLACE ATF TEMPERATURE SENSOR ASSEMBLY

OK -- REPLACE TRANSMISSION WIRE

4. CHECK TRANSMISSION WIRE

(a) Remove the TCM.





(b) Disconnect the connector from the ATF temperature sensor assembly.

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

Standard resistance:





NG -- REPLACE TRANSMISSION WIRE

OK -- REPLACE ATF TEMPERATURE SENSOR ASSEMBLY